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<front>
<journal-meta>
<journal-id>0034-8376</journal-id>
<journal-title><![CDATA[Revista de investigación clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Rev. invest. clín.]]></abbrev-journal-title>
<issn>0034-8376</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Ciencias Médicas y Nutrición Salvador Zubirán]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0034-83762006000400009</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Grandes alcances de los RNAs pequeños RNA de interferencia y microRNA]]></article-title>
<article-title xml:lang="en"><![CDATA[Great potential of small RNas: RNA interference and microRNA]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vázquez-Ortiz]]></surname>
<given-names><![CDATA[Guelaguetza]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Piña-Sánchez]]></surname>
<given-names><![CDATA[Patricia]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Salcedo]]></surname>
<given-names><![CDATA[Mauricio]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Centro Médico Nacional Siglo XXI-IMSS Hospital de Oncología Laboratorio de Oncología Genómica]]></institution>
<addr-line><![CDATA[México D.F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>08</month>
<year>2006</year>
</pub-date>
<volume>58</volume>
<numero>4</numero>
<fpage>335</fpage>
<lpage>349</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0034-83762006000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0034-83762006000400009&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0034-83762006000400009&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[Double-stranded RNA (dsRNA) induces a sequence-specific silencing in eukaryotic cells. This silencing process beggins when long dsRNA is cleaved to 21 to 26 long small RNA by means of the RNAse III-type enzyme Dicer. These small dsRNA are included into silencing effector complexes, that are targeted to complementary sequences. Small RNA dependent gene silencing can be achieved by distinct mechanisms based depending mainly on the nature of target sequences and on the proteins present in the effector complex. The route of interference RNA (RNAi) begins when Dicer yields small interference RNA (siR-NA) that bind to complementary mRNA for its degradation, forming the RISC complex. siRNA are naturally formed from transposons and dsRNA viruses during its replication, as well as from other bidirectional transcribed repetitive sequences. Some of the enzymes thar are part of the RNAi machinery, including Dicer, are encoded by multigene families in many species, that also play a role in other mechanisms of RND-dependent gene silencing. MicroRNA's (miRNA) are other small RNA's that can induce gene silencing at the mRNA level. These are formed in a general manner when Dicer process hairpin structures resulting from the transcription of non-coding sequences from plant and animal genomes. miRNA's are integrated into a RISC-like complex, after which, depending on their degree of complementarity with target mRNA, can either repress translation or induce mRNA degradation. miRNA-dependent silencing is essential for the development of multicellular organisms. Artificial RNAi induction by means of siRNA or miRNA is being used as a tool to inactivate gene expression in culture cells and in living organisms. This review focuses on the progress in the understanding of the mechanisms involved in gene regulation by RNA in animals and details some current efforts to apply theses phenomena as a tool in research and in the therapeutic of human diseases.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El RNA de doble cadena puede inducir un silenciamiento secuencia-específico en eucarionte. Este proceso de silenciamiento se inicia cuando el RNAdc largo es procesado a RNA pequeño de 21 a 26 nucleótidos mediante la enzima RNAsa III Dicer. Estos RNA pequeños se incorporan a complejos efectores de silenciamiento, que son guiados a secuencias complementarias blanco. Existen diferentes tipos de silenciamiento, cuyas diferencias se basan principalmente en la naturaleza de la secuencia blanco y en la composición proteica de los complejos efectores. La ruta del RNA de interferencia (RNAi) se inicia cuando Dicer genera pequeños RNA de interferencia (siRNA) que se unen por complementariedad al mRNA para su degradación, utilizando el complejo RISC. De manera natural, los siRNA se originan de transposones y virus que producen RNAdc durante su replicación, así como también de otras secuencias repetidas transcritas bidireccionalmente. Algunas de las enzimas que conforman la maquinaria del RNAi como Dicer, entre otras, son codificadas por familias multigénicas en varias especies y también participan en otros mecanismos de silenciamiento mediado por RNA. Los microRNA son otros RNA pequeños que pueden inducir silenciamiento al unirse al mRNA. Éstos se generan de manera general cuando Dicer procesa estructuras de horquilla compuestas de regiones no codificantes, en genomas de plantas y animales. Los miRNA se incorporan a un complejo similar a RISC y, dependiendo de su grado de complementariedad con el mRNA blanco, pueden tener represión traduccional o bien digerir el mRNA. El silenciamiento mediado por miRNA es esencial para el desarrollo de plantas y animales. La inducción artificial del RNAi mediante siRNA o miRNA ha sido adoptada como una herramienta para inactivar la expresión génica, tanto en células en cultivo como en organismos vivos. En esta revisión se muestra el gran progreso en el entendimiento de los mecanismos que participan en la regulación génica mediada por RNA en animales y detalla algunos esfuerzos actuales para encauzar a estos mecanismos como una herramienta en la investigación y como posible terapia en enfermedades.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Double stranded RNA]]></kwd>
<kwd lng="en"><![CDATA[Interference RNA]]></kwd>
<kwd lng="en"><![CDATA[MicroRNA]]></kwd>
<kwd lng="en"><![CDATA[Cancer]]></kwd>
<kwd lng="es"><![CDATA[RNA doble cadena]]></kwd>
<kwd lng="es"><![CDATA[RNA de interferencia]]></kwd>
<kwd lng="es"><![CDATA[MicroRNA]]></kwd>
<kwd lng="es"><![CDATA[Cáncer]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="justify"><font face="verdana" size="4">Art&iacute;culo de revisi&oacute;n</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="4"><b>Grandes alcances de los RNAs peque&ntilde;os RNA de interferencia y microRNA</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Great potential of small RNAs: RNA interference and microRNA</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Guelaguetza V&aacute;zquez&#150;Ortiz,* Patricia Pi&ntilde;a&#150;S&aacute;nchez,* Mauricio Salcedo*</b></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i>* Laboratorio de Oncolog&iacute;a Gen&oacute;mica. Unidad de Investigaci&oacute;n M&eacute;dica en Enfermedades Oncol&oacute;gicas. Hospital de Oncolog&iacute;a. Centro M&eacute;dico Nacional Siglo XXI&#150;IMSS.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Reimpresos:</b><i>    <br>   </i>Dra. Guelaguetza Vazquez&#150;Ortiz<b>    <br>   </b><i>Laboratorio de Oncolog&iacute;a Gen&oacute;mica. Hospital de Oncolog&iacute;a. Centro M&eacute;dico Nacional Siglo XXI&#150;IMSS.    <br>   Av. Cuauhtemoc 330. Col. Doctores.    <br>   06720, M&eacute;xico, D.F.    <br>   Tel: +55 56276900, ext. 22708.    <br>   Fax: +55 57610952</i>    <br> Correo electr&oacute;nico: <a href="mailto:gvazquezo@cis.gob.mx">gvazquezo@cis.gob.mx</a> y <a href="mailto:guelav@yahoo.com">guelav@yahoo.com</a></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 28 de septiembre de 2005.    ]]></body>
<body><![CDATA[<br>   Aceptado el 7 de marzo de 2006.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b><i>ABSTRACT</i></b></font></p>     <p align="justify"><font face="verdana" size="2"><i>Double&#150;stranded RNA (dsRNA) induces a sequence&#150;specific silencing in eukaryotic cells. This silencing process beggins when long dsRNA is cleaved to 21 to 26 long small RNA by means of the RNAse III&#150;type enzyme Dicer. These small dsRNA are included into silencing effector complexes, that are targeted to complementary sequences. Small RNA dependent gene silencing can be achieved by distinct mechanisms based depending mainly on the nature of target sequences and on the proteins present in the effector complex. The route of interference RNA (RNAi) begins when Dicer yields small interference RNA (siR&#150;NA) that bind to complementary mRNA for its degradation, forming the RISC complex. siRNA are naturally formed from transposons and dsRNA viruses during its replication, as well as from other bidirectional transcribed repetitive sequences. Some of the enzymes thar are part of the RNAi machinery, including Dicer, are encoded by multigene families in many species, that also play a role in other mechanisms of RND&#150;dependent gene silencing. MicroRNA's (miRNA) are other small RNA's that can induce gene silencing at the mRNA level. These are formed in a general manner when Dicer process hairpin structures resulting from the transcription of non&#150;coding sequences from plant and animal genomes. miRNA's are integrated into a RISC&#150;like complex, after which, depending on their degree of complementarity with target mRNA, can either repress translation or induce mRNA degradation. miRNA&#150;dependent silencing is essential for the development of multicellular organisms. Artificial RNAi induction by means of siRNA or miRNA is being used as a tool to inactivate gene expression in culture cells and in living organisms. This review focuses on the progress in the understanding of the mechanisms involved in gene regulation by RNA in animals and details some current efforts to apply theses phenomena as a tool in research and in the therapeutic of human diseases.</i></font></p>     <p align="justify"><font face="verdana" size="2"><b><i>Key words. </i></b><i>Double stranded RNA.  Interference RNA.  MicroRNA. Cancer.</i></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RESUMEN</b></font></p>     <p align="justify"><font face="verdana" size="2">El RNA de doble cadena puede inducir un silenciamiento secuencia&#150;espec&iacute;fico en eucarionte. Este proceso de silenciamiento se inicia cuando el RNAdc largo es procesado a RNA peque&ntilde;o de 21 a 26 nucle&oacute;tidos mediante la enzima RNAsa III Dicer. Estos RNA peque&ntilde;os se incorporan a complejos efectores de silenciamiento, que son guiados a secuencias complementarias blanco. Existen diferentes tipos de silenciamiento, cuyas diferencias se basan principalmente en la naturaleza de la secuencia blanco y en la composici&oacute;n proteica de los complejos efectores. La ruta del RNA de interferencia (RNAi) se inicia cuando Dicer genera peque&ntilde;os RNA de interferencia (siRNA) que se unen por complementariedad al mRNA para su degradaci&oacute;n, utilizando el complejo RISC. De manera natural, los siRNA se originan de transposones y virus que producen RNAdc durante su replicaci&oacute;n, as&iacute; como tambi&eacute;n de otras secuencias repetidas transcritas bidireccionalmente. Algunas de las enzimas que conforman la maquinaria del RNAi como Dicer, entre otras, son codificadas por familias multig&eacute;nicas en varias especies y tambi&eacute;n participan en otros mecanismos de silenciamiento mediado por RNA. Los microRNA son otros RNA peque&ntilde;os que pueden inducir silenciamiento al unirse al mRNA. &Eacute;stos se generan de manera general cuando Dicer procesa estructuras de horquilla compuestas de regiones no codificantes, en genomas de plantas y animales. Los miRNA se incorporan a un complejo similar a RISC y, dependiendo de su grado de complementariedad con el mRNA blanco, pueden tener represi&oacute;n traduccional o bien digerir el mRNA. El silenciamiento mediado por miRNA es esencial para el desarrollo de plantas y animales. La inducci&oacute;n artificial del RNAi mediante siRNA o miRNA ha sido adoptada como una herramienta para inactivar la expresi&oacute;n g&eacute;nica, tanto en c&eacute;lulas en cultivo como en organismos vivos. En esta revisi&oacute;n se muestra el gran progreso en el entendimiento de los mecanismos que participan en la regulaci&oacute;n g&eacute;nica mediada por RNA en animales y detalla algunos esfuerzos actuales para encauzar a estos mecanismos como una herramienta en la investigaci&oacute;n y como posible terapia en enfermedades.</font></p>     <p align="justify"><font face="verdana" size="2"><b>Palabras clave. </b>RNA doble cadena. RNA de interferencia. MicroRNA. C&aacute;ncer.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>INTRODUCCI&Oacute;N</b></font></p>     <p align="justify"><font face="verdana" size="2">El estudio de la regulaci&oacute;n g&eacute;nica ha cobrado gran importancia; esto confirma que la expresi&oacute;n g&eacute;nica tiene influencia directa sobre una gran cantidad de actividades celulares. Aunque es conocida la actividad de las prote&iacute;nas que intervienen en este proceso, cada d&iacute;a hay m&aacute;s evidencia de que cientos de transcritos peque&ntilde;os pueden ser factores muy importantes en la regulaci&oacute;n gen&eacute;tica.<sup>1</sup> Estas especies de transcritos peque&ntilde;os (RNA) salieron a escena al final de la era gen&oacute;mica, como RNA de expresi&oacute;n ubicua y como represores extraordinariamente vers&aacute;tiles de la expresi&oacute;n g&eacute;nica en plantas, animales y hongos.<sup>2</sup> Estos RNA diminutos, de aproximadamente 21&#150;26 nt, dependen de la maquinaria del RNA de interferencia (RNAi) para efectuar su acci&oacute;n m&aacute;s conocida, es decir, el silenciamiento de la expresi&oacute;n g&eacute;nica al interactuar con secuencias complementarias.<sup>3</sup> Estos RNA se clasifican como a) RNA peque&ntilde;os de interferencia, siRNA (o "short interfering RNA", por su nombre en ingl&eacute;s) y b) microRNAs (miRNA). Ambos son componentes de un mecanismo de regulaci&oacute;n de la expresi&oacute;n g&eacute;nica basado en transcritos, que funciona principalmente en eucariontes.<sup>4,</sup><sup>5</sup> Dentro de las nuevas l&iacute;neas de investigaci&oacute;n, estos RNA peque&ntilde;os se est&aacute;n utilizando con dos prop&oacute;sitos fundamentales: 1) inhibir la actividad viral y de transposones para identificar nuevos m&eacute;todos de defensa del hospedero contra estos microorganismos, y 2) el silenciamiento de la expresi&oacute;n de genes codificantes de diversas prote&iacute;nas de inter&eacute;s funcional.<sup>6&#150;</sup><sup>8</sup> Otros tipos de RNA peque&ntilde;os poco estudiados son los RNA temporales peque&ntilde;os (o stRNA por su nombre en ingl&eacute;s: "small temporal RNAs"), y siRNA heterocrom&aacute;ticos. Se ha observado que los siRNA heterocrom&aacute;ticos pueden intervenir en la organizaci&oacute;n cromos&oacute;mica y en las modificaciones epigen&eacute;ticas de regiones espec&iacute;ficas dentro del genoma.<sup>9</sup></font></p>     <p align="justify"><font face="verdana" size="2">Tomando en cuenta que recientemente el RNAi se ha convertido en uno de los m&eacute;todos m&aacute;s utilizados para analizar a las c&eacute;lulas de los mam&iacute;feros, y que adem&aacute;s tiene el potencial de servir como tratamiento terap&eacute;utico de algunas enfermedades espor&aacute;dicas y hereditarias, en esta revisi&oacute;n se muestra la biog&eacute;nesis, mecanismos de regulaci&oacute;n gen&oacute;mica y aplicaciones de dos de las especies de RNA peque&ntilde;os m&aacute;s estudiados hasta ahora: los siRNA y miRNA.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RNA DE DOBLE CADENA Y RNAi</b></font></p>     <p align="justify"><font face="verdana" size="2">La capacidad del RNA de doble cadena (RNAdc) de interferir en la expresi&oacute;n g&eacute;nica de algunos eucariontes es conocida desde hace varios a&ntilde;os, ya que el RNA largo de doble cadena genera una respuesta de interfer&oacute;n inhibiendo la traducci&oacute;n de prote&iacute;nas a trav&eacute;s de la acci&oacute;n de PKR. Sin embargo, el silenciamiento de genes mediante RNA peque&ntilde;o en eucariontes tambi&eacute;n se identific&oacute; desde hace aproximadamente 20 a&ntilde;os, pero los mecanismos para llevar a cabo el silenciamiento est&aacute;n apenas siendo descritos. Este fen&oacute;meno recibi&oacute; el nombre de RNA de interferencia (RNAi).<sup>10</sup></font></p>     <p align="justify"><font face="verdana" size="2">Antes se pensaba que los RNAdc eran agentes silenciadores inespec&iacute;ficos, incapaces de disociarse y aparearse espec&iacute;ficamente y capaces de inducir destrucci&oacute;n general de distintos RNA mensajeros (RNAm) y, por lo tanto, la supresi&oacute;n total de la traducci&oacute;n de prote&iacute;nas.</font></p>     <p align="justify"><font face="verdana" size="2">Uno de los primeros indicios de que el RNAi era un fen&oacute;meno biol&oacute;gico a&uacute;n no descrito fue la potencia de su efecto. Guo y Kemphues, utilizaron una cadena complementaria del RNA mensajero del gen <i>par&#150;1 </i>para bloquear su expresi&oacute;n en <i>C. elegans </i>mediante la t&eacute;cnica conocida como "silenciamiento por antisentido". &Eacute;sta depende de la liberaci&oacute;n de grandes cantidades en el citoplasma del transcrito peque&ntilde;o complementario al RNAm blanco (secuencia de interferencia o antisentido).<sup>11</sup> Inicialmente se pens&oacute; que era un bloqueo pasivo en el proceso de traducci&oacute;n, debido al apareamiento de bases entre el RNAm de inter&eacute;s y el RNA de interferencia. Posteriormente se encontr&oacute; que tanto la cadena sentido como la antisentido pod&iacute;an inducir silenciamiento del RNAm, lo cual hizo necesario replantear esta hip&oacute;tesis funcional.<sup>12</sup></font></p>     <p align="justify"><font face="verdana" size="2">En 1998 la ruta del RNAi fue reconocida en C. <i>elegans. </i>En este trabajo Fire y cois, sugirieron que el RNAdc, que frecuentemente est&aacute; presente en las c&eacute;lulas durante una infecci&oacute;n viral, podr&iacute;a ser el iniciador o el precursor de la ruta del RNAi. Dicho estudio pretend&iacute;a silenciar el RNAm blanco en forma pasiva microinyectando simult&aacute;neamente concentraciones bajas de secuencias complementarias de RNA sentido y su antisentido, lo que al hibridar form&oacute; complejos de RNAdc.<sup>13,</sup><sup>14</sup> Dado que es posible producir y purificar <i>in vitro </i>RNA e introducirlo directamente en <i>C. elegans </i>y el silenciamiento es heredado a la progenie por v&iacute;a germinal, entonces se comprueba que el RNAdc es un potente activador de la ruta del RNAi, y el silenciamiento es aproximadamente 100 veces m&aacute;s efectivo que el RNA de cadena sencilia.<sup>15,</sup><sup>16</sup></font></p>     <p align="justify"><font face="verdana" size="2">El experimento anterior permite utilizar este inductor en grandes poblaciones de animales como tratamiento, simplemente aliment&aacute;ndolos con bacterias que expresen RNAdc. Tanto en <i>Drosophila,</i><sup>11</sup> como en algunas plantas<sup>18</sup> y hongos,<sup>19,</sup><sup>20</sup> de manera natural existen genes que silencian, ya sea postranscripcionalmente, por co&#150;supresi&oacute;n o por RNAi, sugiriendo que cada uno de estos mecanismos tiene un origen ancestral com&uacute;n en eucariontes.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Poder utilizar la ruta del RNAi como herramienta experimental para silenciar genes espec&iacute;ficos en modelos de mam&iacute;feros ha sido una tarea muy dif&iacute;cil. El problema principal radicaba en hacer que el RNAdc ex&oacute;geno silenciara genes espec&iacute;ficos sin que activara la respuesta del interfer&oacute;n mediante PKR, que es parte del funcionamiento normal de la c&eacute;lula en respuesta a agentes infecciosos y/o virales. No fue hasta que se descubri&oacute; que el siRNA d&uacute;plex puede programar al complejo de silenciamiento de RISC (del que se habla en las siguientes secciones), para inactivar genes espec&iacute;ficos. En mam&iacute;feros el descubrimiento de este &uacute;ltimo proceso fue muy importante debido a que los RNAdc de m&aacute;s de 30 pares de bases activan la respuesta del interfer&oacute;n, mientras que los siRNA d&uacute;plex resultantes de la acci&oacute;n del complejo RISC contienen aproximadamente 19 pb, lo que permite utilizar esta herramienta como una metodolog&iacute;a est&aacute;ndar para silenciar la expresi&oacute;n de genes espec&iacute;ficos en c&eacute;lulas de mam&iacute;feros.<sup>21</sup></font></p>     <p align="justify"><font face="verdana" size="2">La diferencia entre el tipo de respuesta que es generada por la PKR y el RNAi, radica en su respectiva especificidad; la respuesta de PKR inhibe la expresi&oacute;n de manera global, mientras que el RNAi tiene un efecto espec&iacute;fico sobre la expresi&oacute;n de un gen o genes determinados.<sup>22</sup> De manera natural, el silenciamiento por la ruta del RNAi se origina a partir de transposones, de virus que producen RNAdc durante su replicaci&oacute;n, as&iacute; como de algunas secuencias repetidas que se transcriben bidireccionalmente.<sup>23&#150;</sup><sup>25</sup></font></p>     <p align="justify"><font face="verdana" size="2">La ruta del RNAi tambi&eacute;n puede ser inducida por la expresi&oacute;n end&oacute;gena de horquillas peque&ntilde;as de RNA (shRNAs por sus siglas en ingl&eacute;s: "short hairpin RNAs"). &Eacute;stos tienen una estructura similar a una clase de RNA peque&ntilde;os altamente conservados denominados microRNA (miRNA), los cuales median la ruta del RNAi a trav&eacute;s de un mecanismo de inhibici&oacute;n de la traducci&oacute;n. Veremos esto a continuaci&oacute;n.<sup>26,</sup><sup>27</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>BIOG&Eacute;NESIS Y TR&Aacute;FICO DE miRNA</b></font></p>     <p align="justify"><font face="verdana" size="2">De acuerdo con un convenio internacional, un microRNA se define como un RNA de cadena sencilla de 18 a 24 nucle&oacute;tidos de longitud que es generado por la enzima Dicer, una RNAsa de tipo III, a partir de un transcrito end&oacute;geno que contiene una estructura de horquilla. Al momento de escribir este art&iacute;culo, la base de datos de miRNA (disponible en: <A href=http://microrna.sanger.ac.uk/sequences/ target="_blank">http://www.sanger.ac.uk/Software/Rfam/mirna)</A> contiene 2,116 secuencias, de las cuales existen varias espec&iacute;ficas para <i>C. elegans, D. melanogaster, Dardo renio, Gallus gallus, A. thaliana </i>y virus de Epstein Barr, entre otras. Para <i>Homo sapiens </i>existen 638 secuencias.</font></p>     <p align="justify"><font face="verdana" size="2">Aunque la mayor&iacute;a de los miRNA est&aacute;n aislados a lo largo del genoma, algunos se encuentran formando clusters que son transcritos y expresados de manera coordinada. Esto indica una organizaci&oacute;n de tipo oper&oacute;n para algunos miRNA. Los miRNA se localizan en exones e intrones de RNA no codificante, as&iacute; como intrones de mRNA codificante en la misma orientaci&oacute;n que los mRNA, lo cual sugiere que algunos miRNA se podr&iacute;an originar a partir de transcritos de intrones de pre&#150;mRNA que sufrieron escisi&oacute;n.<sup>28</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las enzimas RNAsa de tipo III son una familia de ribonucleasas que reconocen espec&iacute;ficamente al RNAdc y que se cree que est&aacute;n presentes en todas las c&eacute;lulas vivas. Una caracter&iacute;stica importante de las RNAsas de tipo III es que al digerir el RNAdc introducen dos nucle&oacute;tidos en el sitio de digesti&oacute;n.<sup>29&#150;</sup><sup>30</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las c&eacute;lulas humanas expresan tres miembros de esta familia. La expresi&oacute;n de una de estas prote&iacute;nas est&aacute; restringida a la mitocondria, mientras que las otras dos se encuentran en citosol y n&uacute;cleo. &Eacute;stas se denominan Drosha y Dicer y ambas juegan papeles diferentes pero fundamentales en el procesamiento de los miRNA: Drosha participa en el procesamiento de los RNA humanos en el n&uacute;cleo, mientras que Dicer genera casi exclusivamente miRNA y siRNA.</font></p>     <p align="justify"><font face="verdana" size="2">La biog&eacute;nesis de los miRNA presenta varios pasos. Al inicio, los miRNA forman parte de una estructura de tallo y burbuja de aproximadamente 80 nt de longitud, que forma parte del pri&#150;miRNA. Esta estructura es procesada en el n&uacute;cleo por Drosha para liberar una horquilla m&aacute;s peque&ntilde;a de aproximadamente 60 nt de longitud llamada pre&#150;miRNA, la cual contiene un extremo cohesivo colgante. A&uacute;n no se determina la forma exacta en la cual Drosha discrimina estructuras de tallo y burbuja de pre&#150;miRNA y posteriormente determina el sitio exacto de la digesti&oacute;n. (<a href="#f1">Figura 1</a>).<sup>31</sup></font></p>     ]]></body>
<body><![CDATA[<p align="center"><font face="verdana" size="2"><a name="f1"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/ric/v58n4/a9f1.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">Esta enzima forma parte del complejo proteico de 600 kDa denominado "microprocesador". Otro de los componentes esenciales del microprocesador, adem&aacute;s de Drosha, se denomina DGCR8 en humanos y Pasha en <i>Drosophila. </i>El microprocesador se presenta como un heterotetr&aacute;mero y consiste principalmente en dos mol&eacute;culas de Drosha y dos de DGCR8. La prote&iacute;na DGCR8 contiene dos dominios de uni&oacute;n a RNAdc, sugiriendo que &eacute;sta puede jugar un papel importante en el reconocimiento o uni&oacute;n del complejo microprocesador.<sup>32</sup></font></p>     <p align="justify"><font face="verdana" size="2">La Exportina 5 (Exp5) es un miembro de la familia de las karioferinas que son factores de transporte n&uacute;cleo&#150;citoplasma, &eacute;stos son dependientes de un co&#150;factor denominado Ran (una GTPasa) para su funcionamiento. Exp5 forma un heterod&iacute;mero nuclear con Ran&#150;GTP y con los pre&#150;miRNA que resultan del procesamiento de Drosha. De la misma manera que Drosha y el heterod&iacute;mero Exp5/Ran&#150;GTP se une a RNAs peque&ntilde;os que tienen una hebra terminal de aproximadamente 16 bp y una cola cohesiva en el extremo 3', precisamente la estructura que presentan los pre&#150;miRNA.<sup>33&#150;37</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>PROCESAMIENTO CITOPL&Aacute;SMICO DE PRE&#150;miRNA POR Dicer</b></font></p>     <p align="justify"><font face="verdana" size="2">En invertebrados, las enzimas relacionadas a Dicer humana juegan un papel muy importante en el RNAi, digiriendo RNAdc largos a RNA d&uacute;plex de aproximadamente 22 pb que contienen una cola cohesiva de 2 nt en 3'.<sup>38&#150;41</sup> Esta digesti&oacute;n es subsecuente, donde Dicer se une nuevamente a los extremos del RNAdc y vuelve a digerir aproximadamente 22 bases despu&eacute;s del extremo hasta que el RNAdc queda totalmente digerido. Mientras que Dicer digiere al RNAdc que tiene extremos romos, el dominio PAZ de Dicer se une a los extremos de RNAdc que tiene colas cohesivas (como los generados por Dicer).<sup>42</sup></font></p>     <p align="justify"><font face="verdana" size="2">Dicer tambi&eacute;n juega un papel importante en la generaci&oacute;n de los miRNA maduros en vertebrados, donde el dominio PAZ de Dicer se une a la cola cohesiva presente en la base de la horquilla de pre&#150;miRNA, y el dominio de uni&oacute;n a RNAdc de Dicer se une a la base de la burbuja y define la distancia de la digesti&oacute;n desde la base.<sup>43&#150;46</sup> El procesamiento por Dicer genera RNA d&uacute;plex de aproximadamente 22 pb, que contienen dos colas cohesivas en el extremo 3', lo cual es similar tanto en estructura como en funci&oacute;n a los siR&#150;NA d&uacute;plex que son generados por Dicer a partir de RNAdc largos. Despu&eacute;s de la digesti&oacute;n, Dicer permanece asociada con el miRNA o siRNA d&uacute;plex intermediario de 22 pb y posteriormente es liberado por una helicasa (<a href="#f2">Figura 2</a>).</font></p>     <p align="center"><font face="verdana" size="2"><a name="f2"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/ric/v58n4/a9f2.jpg"></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>COMPLEJOS EFECTORES</b></font></p>     <p align="justify"><font face="verdana" size="2">La digesti&oacute;n por Dicer es seguida por la liberaci&oacute;n del miRNA maduro o del siRNA, y tambi&eacute;n por la incorporaci&oacute;n al complejo de RISC ("RNA&#150;induced silencing complex", por sus siglas en ingl&eacute;s) o al de RITS ("RNA&#150;induced initiation of gene transcriptional gene silencing", por sus siglas en ingl&eacute;s), cuyas funciones incluyen digesti&oacute;n del mRNA, supresi&oacute;n de la traducci&oacute;n, silenciamiento transcripcional y formaci&oacute;n de heterocromatina.<sup>47</sup></font></p>     <p align="justify"><font face="verdana" size="2">Existe una variedad de componentes que auxilian en el ensamblaje de RISC, particularmente aquellos que despliegan al siRNA o al miRNA y a trav&eacute;s de esta acci&oacute;n determinan cu&aacute;l cadena de estos RNA d&uacute;plex es la que se activa para el silenciamiento.<sup>48</sup></font></p>     <p align="justify"><font face="verdana" size="2">Los complejos de RISC se componen principalmente de ribonucleoprote&iacute;nas que contienen a miembros de la familia de prote&iacute;nas Argonauta (Ago) con dominios PAZ&#150;Piwi.<sup>49</sup> De manera adicional, RISC contiene varios factores accesorios cuyas acciones son necesarias para la funci&oacute;n efectora. La mayor&iacute;a de los organismos tienen hom&oacute;logos de la familia de Argonauta, <i>Drosophila </i>tiene cinco, el rat&oacute;n tiene ocho y los nem&aacute;todos tienen al menos veinticuatro. Estas prote&iacute;nas dan especificidad al complejo RISC y determinan la respuesta espec&iacute;fica para cada siRNA o miRNA. El dominio Piwi interacciona directamente e inhibe a la regi&oacute;n del dominio de uni&oacute;n de RNa&#150;seIII/dcRNA de Dicer.<sup>50</sup> Esto se ha interpretado como una interacci&oacute;n de transferencia de sustrato y se ha especulado que las interacciones de Piwi con Dicer pueden estimular la liberaci&oacute;n del miRNA o del siRNA. Algunos otros componentes adicionales de RISC han sido identificados y a&uacute;n no se ha descrito su funci&oacute;n en la ruta del RNAi. Dentro de &eacute;stos se encuentran la prote&iacute;na de uni&oacute;n a RNA VIG, el hom&oacute;logo en <i>Drosophila </i>de la prote&iacute;na X Fr&aacute;gil, dFXR, helicasas y Tudor&#150;SN.<sup>51&#150;</sup><sup>56</sup></font></p>     <p align="justify"><font face="verdana" size="2">El ensamblaje de RISC es uno de los pasos m&aacute;s complejos en la ruta del miRNA y del RNAi. Involucra a peque&ntilde;os productores de RNA peque&ntilde;o (DCR), RNA d&uacute;plex peque&ntilde;o, el desdoblamiento de RNA d&uacute;plex de sim&eacute;trico a asim&eacute;trico y el reclutamiento de diferentes prote&iacute;nas Ago. Cada una de las diferentes prote&iacute;nas Ago de RISC tienen funciones diferentes que est&aacute;n posiblemente determinadas por los dominios Piwi de la prote&iacute;na Ago.<sup>57&#150;</sup><sup>60</sup> Algunos dominios Piwi confieren actividad "slicer", mientras que otros no.</font></p>     <p align="justify"><font face="verdana" size="2">Dependiendo del tipo de prote&iacute;nas Ago reclutadas a RISC, estos complejos pueden ser tentativamente divididos en dos tipos: RISC digestivo y RISC no digestivo. Un RISC digestivo tiene una funci&oacute;n dual que dirige tanto la digesti&oacute;n del mRNA blanco como la represi&oacute;n traduccional, dependiendo de las caracter&iacute;sticas del apareamiento entre el RNA peque&ntilde;o y el RNAm. Si la complementariedad entre el apareamiento del siRNA o miRNA y su RNAm blanco no es al 100%, el RNAm es f&iacute;sicamente inalcanzable por el centro activo de la endonucleasa (slicer) del RISC digestivo, ya que se forma una horquilla entre el blanco y los miRNA o siRNA.<sup>61&#150;63</sup> Por lo tanto, esto genera una represi&oacute;n traduccional en lugar de una digesti&oacute;n eficiente del RNAm blanco. En contraste, los RISC no digestivos no tienen actividad de endonucleasa (slicer) en el dominio Piwi de las prote&iacute;nas Ago y pueden utilizar el RNAm blanco s&oacute;lo para la represi&oacute;n de la traducci&oacute;n.<sup>64&#150;68</sup> Adem&aacute;s de estos dos tipos de funcionamiento de RISC, existen otros tipos denominados RITS.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>CONTROL DE LA ESTRUCTURA DE LA CROMATINA POR EL COMPLEJO RITS</b></font></p>     <p align="justify"><font face="verdana" size="2">El efecto de las rutas de silenciamiento del RNA no s&oacute;lo est&aacute; limitado a procesos citopl&aacute;smicos como el apagado del mRNA y la s&iacute;ntesis de prote&iacute;nas. El inicio de la formaci&oacute;n de la cromatina, tanto en los centr&oacute;meros como en otros sitios cromos&oacute;micos, ha mostrado que depende del aparato de silenciamiento del RNA y tambi&eacute;n de los RNA peque&ntilde;os. Independientemente de su papel sobre la estructura del cromosoma durante el crecimiento y la divisi&oacute;n celular, la formaci&oacute;n de heterocromatina inducida por RNAdc tambi&eacute;n parece generar silenciamiento transcripcional en respuesta a la expresi&oacute;n de transgenes o transposones. Dependiendo del organismo y del contexto celular espec&iacute;fico, los RNA peque&ntilde;os que derivan de secuencias repetidas o de transgenes pueden metilar el DNA, o bien, las histonas. Este fen&oacute;meno ha sido descrito en protozoarios, plantas, insectos y vertebrados; sin embargo, donde se ha descrito de manera principal es en <i>Schizosaccharomyces pombe.</i><sup>69,74 </sup>En esta levadura Agol, el &uacute;nico hom&oacute;logo de Argonauta, es ensamblado dentro del complejo de RITS. Este complejo adem&aacute;s se forma de Chpl, una prote&iacute;na de uni&oacute;n a centr&oacute;mero que contiene un cromo&#150;dominio y que es necesaria para la metilaci&oacute;n de la histona H3 lisina 9 en los repetidos del centr&oacute;mero. Y tambi&eacute;n este complejo se conforma por Tas3, una prote&iacute;na de funci&oacute;n desconocida. El RITS utiliza siRNA provenientes de transcritos centrom&eacute;ricos repetidos para guiar su localizaci&oacute;n en estos repetidos e inducir la formaci&oacute;n de heterocromatina. Independientemente del mecanismo, identificar un complejo efector que contenga Ago indica que &eacute;ste pudiera ser un mecanismo paralelo a miRISC o siRISC.<sup>75&#150;</sup><sup>79</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>ACTIVACI&Oacute;N DIRIGIDA DE LA RUTA DE SILENCIAMIENTO DEL RNAi: siRNA Y miRNA</b></font></p>     <p align="justify"><font face="verdana" size="2">La ruta de procesamiento del RNAi ilustrada en la <a href="/img/revistas/ric/v58n4/a9f3.jpg" target="_blank">Figura 3</a>, est&aacute; conservada en la mayor&iacute;a de las c&eacute;lulas eucariontes y puede utilizarse para promover la entrada de siRNA ex&oacute;genos o sint&eacute;ticos. Como se mencion&oacute;, en muchos vertebrados los RNAdc de mayor longitud pueden activar la respuesta de interfer&oacute;n, por lo que su uso no permite silenciar genes de manera dirigida en estos organismos. Para silenciar genes espec&iacute;ficos ha sido necesario realizar transfecciones con siRNA d&uacute;plex sint&eacute;tico, que es muy parecido al miRNA d&uacute;plex, haciendo que act&uacute;e RISC. Aunque estos experimentos resultaron en la destrucci&oacute;n espec&iacute;fica y efectiva de los mRNA blanco, los siRNA sint&eacute;ticos son muy caros y la transfecci&oacute;n del RNA es poco eficiente en todas las c&eacute;lulas de inter&eacute;s. Para superar este problema se han utilizado promotores dependientes de RNA polimerasa, desarrollando pl&aacute;smidos que puedan expresar peque&ntilde;as estructuras de RNA de horquilla, an&aacute;logas estructuralmente a los pre&#150;miRNA. A partir de esto, una serie de trabajos posteriores han refinado los par&aacute;metros para dise&ntilde;ar las estructuras peque&ntilde;as de RNA de horquilla para obtener silenciamiento exitoso por RNAi. Actualmente se sabe que las secuencias de 25 a 29 pb favorecen el procesamiento del RNA y la expresi&oacute;n de siRNA.<sup>33,80</sup></font></p>     <p align="justify"><font face="verdana" size="2">Tambi&eacute;n se han desarrollado vectores virales basados en el genoma del virus de leucemia murina o de inmunodeficiencia humana que incorporan casetes de expresi&oacute;n con peque&ntilde;as estructuras de horquilla. Estos vectores infectan a las c&eacute;lulas blanco <i>in vivo </i>e <i>in vitro, </i>generando expresi&oacute;n estable de los siRNA y supresi&oacute;n a largo plazo del mRNA blanco. Otros vectores de expresi&oacute;n con peque&ntilde;as estructuras de horquilla est&aacute;n basados en lentivirus y han sido utilizados de manera eficiente y estable para suprimir la expresi&oacute;n de genes en ratones transg&eacute;nicos.<sup>81,82</sup></font></p>     <p align="justify"><font face="verdana" size="2">El primer miRNA descrito fue lin&#150;4, que ayuda a controlar la duraci&oacute;n de los diferentes estadios del desarrollo de la larva de <i>C. elegans. </i>Este gen no codifica ninguna prote&iacute;na, sino que produce un par de RNA peque&ntilde;os. La mayor&iacute;a de los miRNA provienen de regiones del genoma muy distantes de los genes hasta ahora descritos, lo que sugiere que provienen de unidades de transcripci&oacute;n independientes y se ha mostrado que aproximadamente una cuarta parte de los miRNA descritos hasta ahora est&aacute;n localizados en intrones de pre mRNA.<sup>83 </sup>Otros miRNA se agrupan de manera secuencial a lo largo del genoma, con un arreglo en el patr&oacute;n de expresi&oacute;n que implica una transcripci&oacute;n de tipo multicistr&oacute;nico. La mayor&iacute;a de los genes que codifican miRNA en nem&aacute;todos y en humanos est&aacute;n aislados, mientras que en <i>Drosophila </i>son secuenciales.<sup>84</sup> Como se mencion&oacute; antes, no se conocen con precisi&oacute;n los blancos de los miRNA y, por lo tanto, tampoco todas sus funciones. Es posible que las secuencias blanco de los miRNA no se restrinjan s&oacute;lo a RNAm, sino que algunos podr&iacute;an hibridar con regiones de RNA no codificante.<sup>85&#150;</sup><sup>88</sup> La identificaci&oacute;n de secuencias blanco reguladoras de cada miRNA est&aacute; a&uacute;n muy lejana. Para identificarlas dentro de las rutas metab&oacute;licas celulares en un contexto biol&oacute;gico, probablemente ser&aacute; necesaria la intervenci&oacute;n de otras ciencias como la bioqu&iacute;mica, la bioinform&aacute;tica y la gen&eacute;tica.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>DIFERENCIAS ENTRE siRNA Y miRNA</b></font></p>     <p align="justify"><font face="verdana" size="2">Como hemos visto, los siRNA y los miRNA comparten algunas funciones y muchos de sus aspectos, incluyendo su composici&oacute;n qu&iacute;mica y mecanismos de acci&oacute;n. Adem&aacute;s, parte de la biog&eacute;nesis de miRNA y siRNA end&oacute;genos es compartida, todo lo cual hace dif&iacute;cil la distinci&oacute;n entre ellos. Sin embargo, algunas estriban en:</font></p>     <p align="justify"><font face="verdana" size="2">1. Los miRNA son procesados principalmente a partir de transcritos en horquilla, mientras que los siRNA provienen generalmente de grandes mol&eacute;culas de RNA d&uacute;plex.</font></p>     <p align="justify"><font face="verdana" size="2">2. Cada mol&eacute;cula precursora de horquilla genera un solo RNA d&uacute;plex de miRNA:miRNA, mientras que cada siRNA precursor genera varios siRNA d&uacute;plex diferentes, provenientes de cada extremo del RNAdc.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">3. Las secuencias de miRNA est&aacute;n relativamente conservadas en organismos relacionados, no as&iacute; las secuencias end&oacute;genas de siRNA.</font></p>     <p align="justify"><font face="verdana" size="2">4. Es posible que los siRNA end&oacute;genos realicen un "autosilenciamiento", ya que silencian el mismo locus, o uno muy similar al que les dio origen, mientras que los miRNA llevan a cabo un "heterosilenciamiento", ya que algunos se producen a partir de genes que pueden silenciar a varios genes blanco.<sup>63,</sup><sup>89</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>LA RUTA DEL RNAi EN LA GEN&Eacute;TICA DE MAM&Iacute;FEROS</b></font></p>     <p align="justify"><font face="verdana" size="2">En experimentos basados en RNAi, una de las primeras decisiones que hay que tomar es cu&aacute;l tipo de RNA, siRNA o miRNA habr&aacute; de utilizarse para activar la supresi&oacute;n. Las principales ventajas del siRNA son: su alta eficacia para la liberaci&oacute;n de secuencias dentro de la c&eacute;lula, lo que resulta en concentraciones altas del gen silenciador, adem&aacute;s de la gran disponibilidad comercial de siRNA prevalidados. Entre las limitaciones de los siRNA destaca el hecho de que sus efectos son transitorios y dependientes de la tasa de divisi&oacute;n celular, ya que las c&eacute;lulas de mam&iacute;feros no tienen mecanismos para amplificar y propagar el RNAi (como las plantas y <i>C. elegans), </i>adem&aacute;s de que algunas c&eacute;lulas son muy dif&iacute;ciles de transfectar y de que el proceso de transfecci&oacute;n <i>per se </i>puede alterar la fisiolog&iacute;a de la c&eacute;lula.<sup>90&#150;</sup><sup>92</sup></font></p>     <p align="justify"><font face="verdana" size="2">En el caso de los miRNA la inversi&oacute;n es mucho mayor, ya que es necesario dise&ntilde;ar oligonucle&oacute;tidos para clonarlos y secuenciarlos, lo cual es indispensable para producir una construcci&oacute;n &oacute;ptima. Sin embargo, los miRNA son capaces de producir silenciamiento sostenido y expresarse abundantemente mediante transfecci&oacute;n convencional o utilizando diversos vectores virales que permitan su integraci&oacute;n estable en el genoma. Adem&aacute;s, los vectores de expresi&oacute;n del miRNA pueden ser propagados indefinidamente.<sup>57</sup></font></p>     <p align="justify"><font face="verdana" size="2">Ambos se han utilizado para determinar la funci&oacute;n de diversos genes <i>in vivo, </i>principalmente en ratones. La primera demostraci&oacute;n de silenciamiento en animales adultos mediada por RNAi, se hizo mediante la represi&oacute;n del gen reportero de luciferasa, mediante la transfecci&oacute;n de pl&aacute;smidos con siRNA y miRNA en el h&iacute;gado de un rat&oacute;n.<sup>93</sup> En estudios subsecuentes se introdujeron siRNA y miRNA a varias c&eacute;lulas de diferentes formas, como inyecci&oacute;n del &aacute;cido nucleico desnudo o mediante lipofecci&oacute;n inhibiendo la expresi&oacute;n de diversos genes blanco.</font></p>     <p align="justify"><font face="verdana" size="2">El silenciamiento de genes a largo plazo <i>in vivo </i>se ha demostrado produciendo mosaicismo gen&eacute;tico y transferencia a la l&iacute;nea germinal. Por ejemplo, el crecimiento de un tumor en un modelo xenog&eacute;nico puede atenuarse agregando a las c&eacute;lulas un c&aacute;sete de miRNA cuyo blanco sea el oncog&eacute;n RAS, permitiendo que &eacute;ste se active antes de reinyectar las c&eacute;lulas al animal. Tambi&eacute;n se ha suprimido la expresi&oacute;n de genes espec&iacute;ficos en c&eacute;lulas germinales y sus &oacute;rganos productores.<sup>94&#150;</sup><sup>98</sup></font></p>     <p align="justify"><font face="verdana" size="2">Algunos oligonucle&oacute;tidos sint&eacute;ticos suprimen el gen blanco de manera transmisible, basados en la acci&oacute;n de heredabilidad dominante de un c&aacute;sete de expresi&oacute;n de miRNA. Con el &eacute;xito de estas estrategias surgieron muchos experimentos que incluyeron inyecciones nucleares, creaci&oacute;n de quimeras mediante c&eacute;lulas germinales sometidas a ingenier&iacute;a gen&eacute;tica, y por transg&eacute;nesis mediante la inyecci&oacute;n de lentivirus en huevos fertilizados. En la actualidad, esta tecnolog&iacute;a ya permite la creaci&oacute;n de animales con silenciamiento inducible de casi cualquier gen.<sup>81,</sup><sup>82,</sup><sup>99,</sup><sup>100</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>EL RNAi COMO UNA HERRAMIENTA DE AN&Aacute;LISIS GEN&Oacute;MICO GLOBAL</b></font></p>     <p align="justify"><font face="verdana" size="2">Parad&oacute;jicamente los miRNA pueden tambi&eacute;n utilizarse para el an&aacute;lisis gen&oacute;mico global a partir de estudios a peque&ntilde;a escala. Recientemente se utiliz&oacute; una biblioteca de estos RNA dirigida a la familia de las enzimas de la desubicuitinaci&oacute;n, encontrando que el gen supresor de tumor CYLD (gen de susceptibilidad a cilindromatosis) suprime la actividad de NF&#150;kB. Este resultado origin&oacute; diversas propuestas para el tratamiento de la cilindromatosis con f&aacute;rmacos ya existentes, y confirm&oacute; que los estudios gen&eacute;ticos no solamente generan avances en la biolog&iacute;a, sino que podr&iacute;an proveer avances pr&aacute;cticos en el tratamiento racional de enfermedades.<sup>101&#150;</sup><sup>104</sup></font></p>     <p align="justify"><font face="verdana" size="2">Las bibliotecas de siRNA pueden construirse mediante s&iacute;ntesis qu&iacute;mica o por digesti&oacute;n enzim&aacute;tica de RNAdc largos. De manera alternativa, la construcci&oacute;n de varios vectores de expresi&oacute;n de miRNA que tengan cada uno un gen blanco, permite tambi&eacute;n la producci&oacute;n de bibliotecas. Recientemente, dos grupos publicaron la producci&oacute;n de bibliotecas a partir de oligonucle&oacute;tidos sint&eacute;ticos que cubren aproximadamente 10,000 genes &uacute;nicos.<sup>105</sup> Otro grupo de investigaci&oacute;n cre&oacute; una biblioteca de miRNA mediante productos de PCR. Por otro lado, tambi&eacute;n existen m&eacute;todos para construir bibliotecas de miRNA basadas en la manipulaci&oacute;n del RNA complementario.<sup>106</sup> Todo esto est&aacute; en desarrollo y pronto veremos sus resultados.</font></p>     <p align="justify"><font face="verdana" size="2">Los an&aacute;lisis a gran escala con bibliotecas de siRNA, pueden realizarse por medio de microarreglos imprimiendo diferentes miRNA o siRNA sobre laminillas de s&iacute;lice para realizar trasfecciones inversas. Este tipo de transfecciones involucran a la deposici&oacute;n de complejos &aacute;cidos nucleicol&iacute;pidos sobre una superficie s&oacute;lida y las c&eacute;lulas que se plaquean sobre esta superficie "tomar&aacute;n" el DNA o RNA encapsulado para regular la expresi&oacute;n o el silenciamiento del RNAm.<sup>107&#150;109</sup> Otra manera de valorar los efectos del miRNA es por medio de una transfecci&oacute;n <i>in situ, </i>seleccionando las c&eacute;lulas transfectadas en cultivo ya sea mediante citosinas o bien por antibi&oacute;ticos y posteriormente realizar microarreglos de expresi&oacute;n para determinar la expresi&oacute;n diferencial en cada una de las c&eacute;lulas (<a href="#f4">Figura 4</a>).<sup>110&#150;112</sup></font></p>     <p align="center"><font face="verdana" size="2"><a name="f4"></a></font></p>     <p align="center"><font face="verdana" size="2"><img src="/img/revistas/ric/v58n4/a9f4.jpg"></font></p>     <p align="justify"><font face="verdana" size="2">En conclusi&oacute;n, el &eacute;xito del empleo del RNAi para analizar la funci&oacute;n de un solo gen ha llevado a aplicar esta tecnolog&iacute;a a gran escala. Ahora que los genomas del humano, rat&oacute;n, rata y chimpanc&eacute; est&aacute;n completamente secuenciados, el RNAi provee un mecanismo mediante el cual toda esta informaci&oacute;n puede ser traducida a generar definiciones funcionales para cada gen.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RNAi EN EL TRATAMIENTO Y DESCUBRIMIENTO DE NUEVOS F&Aacute;RMACOS</b></font></p>     <p align="justify"><font face="verdana" size="2">Como hemos visto, el RNAi ha comenzado a cambiar los paradigmas hasta ahora existentes en el proceso del descubrimiento de nuevos f&aacute;rmacos. Con los m&eacute;todos de an&aacute;lisis a gran escala que se mencionaron, el RNAi cobra gran importancia, ya que puede enfocarse directamente a la b&uacute;squeda de los blancos de f&aacute;rmacos m&aacute;s promisorios.</font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Sin embargo, desde que se describi&oacute; por primera vez la utilizaci&oacute;n de RNAi en c&eacute;lulas de mam&iacute;feros, se han realizado muchos estudios para utilizarlos en el tratamiento de enfermedades. Su eficacia en la terap&eacute;utica depender&aacute; de la especificidad de la inhibici&oacute;n a la que el gen blanco es sometido. En tal caso, las posibles secuencias blanco para tratar enfermedades ser&iacute;an: oncogenes, genes supresores o incluso polimorfismos de un solo nucle&oacute;tido (SNP). Adem&aacute;s, hay grandes esperanzas de poder alg&uacute;n d&iacute;a utilizar el RNAi en el tratamiento de enfermedades virales como la hepatitis C y las infecciones por virus de inmunodeficiencia humana (VIH), de lo cual hay resultados preliminares. No obstante el gran potencial de esta t&eacute;cnica en terap&eacute;utica, debemos mantener en mente su posible toxicidad, cuyas consecuencias no estamos en condiciones de predecir. Actualmente existen propuestas cl&iacute;nicas para utilizar miRNA sint&eacute;ticos o vectores virales como tratamiento, pero ninguna ha sido aprobada.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RNAi EN EL TRATAMIENTO DE PACIENTES CON VIH</b></font></p>     <p align="justify"><font face="verdana" size="2">El uso de la combinaci&oacute;n de dos o tres f&aacute;rmacos en el tratamiento del VIH ha ayudado enormemente a los pacientes infectados. Sin embargo, a pesar del aparente &eacute;xito de los nuevos agentes antirretrovirales, persisten problemas debido principalmente al surgimiento de variantes virales resistentes a dichos agentes y a la emergente toxicidad resultante de las mezclas de los diferentes f&aacute;rmacos. De ah&iacute; el gran inter&eacute;s en la b&uacute;squeda de nuevos tratamientos antirretrovirales. El VIH fue el primer agente infeccioso estudiado mediante RNAi, probablemente debido a que su patr&oacute;n de expresi&oacute;n y ciclo de vida est&aacute;n siendo conocidos. Se han utilizado varias secuencias sint&eacute;ticas de siRNA y miRNA para silenciar los RNA de expresi&oacute;n temprana y tard&iacute;a del VIH en l&iacute;neas celulares y en c&eacute;lulas hematopoy&eacute;ticas.<sup>113&#150;114</sup> Aunque la inhibici&oacute;n de secuencias de VIH en cultivos celulares por RNAi ha sido efectiva hasta ahora, el reto actual es la alta tasa de mutaci&oacute;n del virus que, adem&aacute;s de permitirle evadir la respuesta inmune, podr&iacute;a permitir tambi&eacute;n a las secuencias mutantes escapar del silenciamiento. De ah&iacute; que otra alternativa terap&eacute;utica en esta enfermedad es la supresi&oacute;n de co&#150;factores celulares requeridos para la infecci&oacute;n por VIH. Algunos cofactores celulares como el receptor de VIH CD4 y otros, han sido suprimidos en l&iacute;neas celulares de linfocitos T y c&eacute;lulas germinales derivadas de macr&oacute;fagos mediante RNAi, resultando en inhibici&oacute;n de la replicaci&oacute;n del VIH o de la invasi&oacute;n celular.<sup>113</sup></font></p>     <p align="justify"><font face="verdana" size="2">La liberaci&oacute;n de siRNA y miRNA dentro de las c&eacute;lulas infectadas con VIH es un problema. Dado que la acci&oacute;n de los siRNA no persiste largos periodos de tiempo en la c&eacute;lula, y considerando que las c&eacute;lulas a tratar son linfocitos T, monocitos y macr&oacute;fagos, estos RNA peque&ntilde;os deben ser introducidos en las c&eacute;lulas varias veces durante a&ntilde;os para tener &eacute;xito en el control de la infecci&oacute;n.<sup>100,</sup><sup>115&#150;117</sup> Adem&aacute;s, cualquier m&eacute;todo de transfecci&oacute;n que no tenga 100% de eficacia permite la persistencia de clonas infectadas que a largo plazo, al expandirse, permiten la persistencia del virus. Por otro lado, la utilizaci&oacute;n de vectores virales de miRNA tambi&eacute;n causa problemas debido a la respuesta inmune que el mismo vector puede causar en el individuo.<sup>100,118,119</sup> De ah&iacute; que uno de los m&eacute;todos que han sido mayormente utilizados sea aislar c&eacute;lulas T de los pacientes para ser transfectadas, crecidas e introducidas en los mismos pacientes. Para lo anterior, tambi&eacute;n se han utilizado c&eacute;lulas precursoras transfectadas con vectores que contienen los genes terap&eacute;uticos, las cuales generar&aacute;n c&eacute;lulas hematopoy&eacute;ticas resistentes al virus. <sup>115,</sup><sup>120,</sup><sup>121 </sup>Las c&eacute;lulas madre son adquiridas del paciente y transducidas <i>ex vivo </i>antes de transferencia adoptiva o reconstituci&oacute;n <i>in vivo. </i>Debido a que el RNAi ha demostrado ser m&aacute;s exitoso que algunas sondas antisentido o ribozimas que se utilizan actualmente, se cree que esta tecnolog&iacute;a podr&aacute; ser utilizada en humanos en los pr&oacute;ximos a&ntilde;os.<sup>115</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RNAi EN EL TRATAMIENTO DE LAS HEPATITIS VIRALES</b></font></p>     <p align="justify"><font face="verdana" size="2">La hepatitis producida por los virus de hepatitis B (VHB) y C (VHC) es un problema muy importante de salud a nivel mundial, ya que millones de individuos se infectan anualmente. Hoy en d&iacute;a existe una vacuna contra el VHB pero el tratamiento solamente funciona para prevenir la infecci&oacute;n viral y no existe todav&iacute;a vacuna para VHC. De ah&iacute; que la hepatitis causada por estos dos agentes virales sea un blanco potencial de terapia por RNAi.<sup>122</sup></font></p>     <p align="justify"><font face="verdana" size="2">El VHC infecta aproximadamente a 3% de la poblaci&oacute;n mundial y es el factor etiol&oacute;gico m&aacute;s importante de enfermedad cr&oacute;nica del h&iacute;gado que puede progresar a cirrosis hep&aacute;tica y a carcinoma hep&aacute;tico. El genoma del VHC es una cadena positiva de RNA que se procesa postranscripcionalmente para producir por lo menos diez prote&iacute;nas. En algunos estudios se han transfectado regiones subgen&oacute;micas o replicones con el genoma del VHC a c&eacute;lulas derivadas de hepatocarcinoma para estudiar nuevos f&aacute;rmacos antivirales. En otros trabajos se ha inyectado siRNA antiVHC en ratones para digerir secuencias de VHC utilizando una construcci&oacute;n de VHC&#150;luciferasa, como gen reportero, en hepatocitos de rat&oacute;n <i>in vivo.</i><sup>123,</sup><sup>126</sup></font></p>     <p align="justify"><font face="verdana" size="2">En estudios <i>in vivo </i>se utilizaron siRNA para tratar la hepatitis fulminante inducida por un anticuerpo agonista antifas en ratones. Los siRNA anti&#150;fas se inyectaron a ratones previamente tratados con el anticuerpo. El 82% de los ratones sobrevivi&oacute; por 10 d&iacute;as, mientras que los controles murieron a los tres d&iacute;as. Los ratones que padec&iacute;an hepatitis autoinmune tambi&eacute;n mejoraron despu&eacute;s del tratamiento con siRNA. De ah&iacute; que el siRNA podr&iacute;a disminuir la severidad de algunas enfermedades interfiriendo con la respuesta inflamatoria m&aacute;s que con el agente infeccioso mismo. De la misma manera que con el VIH, la liberaci&oacute;n de los siRNA o de los vectores de miRNA es el reto actual a vencer para poder lograr un posible tratamiento del VHC, ya que el m&eacute;todo de inyecci&oacute;n intravenosa utilizada en ratones no es factible en el tratamiento de la hepatitis humana. Aunque en ratones el material gen&eacute;tico puede introducirse en los hepatocitos utilizando cat&eacute;teres, no existen m&eacute;todos de liberaci&oacute;n efectiva y sin riesgos para su uso en humanos.<sup>127,</sup><sup>129</sup></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RNAi Y C&Aacute;NCER</b></font></p>     <p align="justify"><font face="verdana" size="2">Algunos estudios sugieren que el RNAi puede ser utilizado como tratamiento potencial en c&aacute;ncer. Aunque no existen protocolos de RNAi en proceso, los antecedentes son estudios en que se utiliz&oacute; DNA antisentido. El primer oligonucle&oacute;tido antisentido utilizado para el tratamiento del c&aacute;ncer fue el Genasense (Genta, Inc.), que tiene como blanco al gen antiapopt&oacute;tico BCL&#150;2, su uso, en combinaci&oacute;n con quimioterapia convencional, ha dado resultados alentadores en melanoma. Sin embargo, su uso como f&aacute;rmaco recientemente aprobado por la FDA ha sido postergado sin explicar la causa.<sup>130,</sup><sup>131</sup> Es innegable que el uso potencial del RNAi para tratar c&aacute;ncer metast&aacute;tico depender&aacute; de encontrar buenos genes blanco en las c&eacute;lulas.</font></p>     <p align="justify"><font face="verdana" size="2">Aparentemente la expresi&oacute;n de los miRNA es regulada tanto por el tipo de c&eacute;lula como por su estadio de progresi&oacute;n. En 2003 se report&oacute; que este aspecto de especificidad se mantiene a&uacute;n en c&aacute;ncer, ya que al medir la expresi&oacute;n de 217 miRNA humanos en muestras de c&aacute;ncer encontraron que el patr&oacute;n de expresi&oacute;n de estos RNA peque&ntilde;os var&iacute;a en los diferentes tipos de tumor. Es importante mencionar que los patrones de expresi&oacute;n de este peque&ntilde;o grupo de miRNA definen e identifican mejor los diferentes tipos de c&aacute;ncer que los datos de expresi&oacute;n generados por microarreglos de cDNA con 16,000 clonas, lo que lo ubica como una novedosa estrategia para clasificar los diferentes tipos de c&aacute;ncer.<sup>132,</sup><sup>133</sup></font></p>     <p align="justify"><font face="verdana" size="2">Como se esperaba, la expresi&oacute;n de algunos miRNA est&aacute; relacionada directamente con el desarrollo y con el tejido en que se desarrollan. Los tumores de un mismo origen embrionario tienen patrones de expresi&oacute;n similares (por ejemplo el c&aacute;ncer g&aacute;strico, el hepatocarcinoma y el c&aacute;ncer de colon, que derivan del endodermo). Las leucemias tienen un patr&oacute;n muy diferente al de los tumores s&oacute;lidos y est&aacute;n subagrupadas de acuerdo con anormalidades gen&eacute;ticas. Es posible que m&aacute;s observaciones ayuden a mejorar el diagn&oacute;stico de los c&aacute;nceres poco diferenciados con or&iacute;genes desconocidos y aporten mejores opciones para el tratamiento.</font></p>     <p align="justify"><font face="verdana" size="2">Considerando que en algunos linfomas hay copias extras de un fragmento del cromosoma 13 (13q31&#150;32), se determin&oacute; que en esta regi&oacute;n que se amplifica existe un gen que se llama cl3orf25 que codifica el precursor de siete miRNA. He <i>et al. </i>encontraron que los miRNA derivados de cl3orf25 se sobrexpresan en c&eacute;lulas de linfoma que tienen copias extra del cl3orf25. Para identificar las consecuencias biol&oacute;gicas de la sobrexpresi&oacute;n de este miRNA, se utiliz&oacute; un modelo murino de linfoma inducido por el oncogen myc. Se infectaron c&eacute;lulas precursoras hematopoy&eacute;ticas de este rat&oacute;n con un retrovirus que conten&iacute;a una regi&oacute;n del cluster de miRNA, y se inyectaron en ratones. En &eacute;stos, la leucemia se desarroll&oacute; en 51 d&iacute;as, mientras que en los controles, inyectados con un vector vac&iacute;o, la leucemia se desarroll&oacute; en un periodo de 3 a 6 meses. El mecanismo de funcionamiento no ha sido a&uacute;n descrito y tampoco se ha determinado cu&aacute;l de los componentes del cluster de cl3orf25 es el causante. Sin embargo, este estudio identifica al primer oncogen que no codifica ninguna prote&iacute;na.<sup>134</sup></font></p>     <p align="justify"><font face="verdana" size="2">En c&aacute;ncer, frecuentemente se sobreexpresa el gen regulador de la trascripci&oacute;n C&#150;MYC. En un trabajo reciente de O'Donell <i>et al., </i>se utiliz&oacute; una l&iacute;nea celular de linfoma que expresa el gen C&#150;MYC. En estas c&eacute;lulas se activ&oacute; este transcrito utilizando un inductor y se detect&oacute; que el aumento en la expresi&oacute;n de C&#150;MYC resulta en expresi&oacute;n de seis miRNA. De &eacute;stos, dos est&aacute;n codificados por el cluster de cl3orf25 y el resto por clusters de los cromosomas 7 y X.<sup>135</sup></font></p>     <p align="justify"><font face="verdana" size="2">Es evidente la necesidad de definir las rutas biol&oacute;gicas alteradas en c&aacute;ncer que son reguladas por miRNA. Esto resulta bastante complejo debido a las funciones duales de los mismos miRNA como las previamente descritas. La identificaci&oacute;n de las redes reguladoras de los miRNA es uno de los retos actuales, pero esto se apoya en la evidencia de que la regulaci&oacute;n de la expresi&oacute;n g&eacute;nica es esencial en el estudio del crecimiento, desarrollo y sobrevivencia de los organismos multicelulares.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>RNAi, VIRUS DE PAPILOMA HUMANO Y C&Aacute;NCER CERVICOUTERINO</b></font></p>     ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">El c&aacute;ncer cervicouterino (CC) es la segunda causa de muerte en mujeres por neoplasia en M&eacute;xico. El virus de papiloma humano (VPH) es considerado el factor etiol&oacute;gico m&aacute;s importante, ya que se encuentra presente en 99% de todas las muestras. La infecci&oacute;n por VPH a la c&eacute;lula hace que se traduzcan dos oncoprote&iacute;nas virales denominadas E6 y E7, las cuales se unen a las prote&iacute;nas celulares p53 y RB respectivamente, inactiv&aacute;ndolas. Recientemente, diversos grupos se han dado a la tarea de dise&ntilde;ar una vacuna contra este virus; sin embargo, hasta la fecha no existe ninguna de estas vacunas, ya sea preventiva o de tratamiento disponible en el mercado.</font></p>     <p align="justify"><font face="verdana" size="2">Bas&aacute;ndose en que la inhibici&oacute;n de factores antiapopt&oacute;ticos podr&iacute;a tener gran importancia en terapias antitumorales, trabajos recientes reportan que en l&iacute;neas celulares derivadas de CC e infectadas con VPH cuando se utiliza siRNA para el oncogen E6, se acumula p53, se transactiva el gen p21 (controlador del ciclo celular) y se reduce el crecimiento celular, adem&aacute;s de que se restablece la actividad de las rutas supresoras de tumor. Mientras que al inhibir E7 se induce la muerte celular abriendo la posibilidad de utilizar siRNA en el tratamiento del CC. Por otro lado, trabajos recientes indican que cuando se utiliza siRNA contra las oncoprote&iacute;nas virales E6 y E7, adem&aacute;s de los efectos antes mencionados, se incrementa el efecto terap&eacute;utico del cisplatino, que es el tratamiento m&aacute;s empleado en CC, como resultado directo del incremento en los niveles de p53. Sin embargo, aunque el panorama resulte bastante similar al de VIH y VHC, es muy evidente que el estudio del c&aacute;ncer cervicouterino mediante RNAi a&uacute;n no ha tenido la atenci&oacute;n suficiente, convirti&eacute;ndolo en un blanco de investigaci&oacute;n.<sup>136&#150;139</sup></font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>CONCLUSIONES</b></font></p>     <p align="justify"><font face="verdana" size="2">En un periodo de tiempo relativamente corto, y a partir de su descubrimiento en modelos animales, la ruta de silenciamiento del RNAi es ya considerada una poderosa herramienta para la determinaci&oacute;n de la funci&oacute;n de los genes de mam&iacute;feros. Conforme aumente nuestro conocimiento sobre la biolog&iacute;a y bioqu&iacute;mica de este mecanismo conservado de regulaci&oacute;n g&eacute;nica, mejorar&aacute; nuestra habilidad para utilizar al RNAi como herramienta experimental. Con el auge de los estudios de RNAi en diferentes modelos animales, en un futuro cercano podr&aacute; establecerse la mejor estrategia para utilizar el RNAi en terapia.</font></p>     <p align="justify"><font face="verdana" size="2">Queda una pregunta en el aire: &iquest;podr&aacute; el RNAi revolucionar el tratamiento de enfermedades de la misma manera en que ha revolucionado a la investigaci&oacute;n b&aacute;sica en la b&uacute;squeda de la funci&oacute;n de los genes?</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>AGRADECIMIENTO</b></font></p>     <p align="justify"><font face="verdana" size="2">A la M. en C. Patricia Mendoza Lorenzo, por su valiosa participaci&oacute;n en la revisi&oacute;n del manuscrito.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     ]]></body>
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