<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-9940</journal-id>
<journal-title><![CDATA[Archivos de cardiología de México]]></journal-title>
<abbrev-journal-title><![CDATA[Arch. Cardiol. Méx.]]></abbrev-journal-title>
<issn>1405-9940</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Cardiología Ignacio Chávez]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-99402011000300013</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Genética y genómica de la hipertensión arterial: una actualización]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetic and genomic studies in the hypertension: an actualization]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Bello]]></surname>
<given-names><![CDATA[Julián]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Pérez-Méndez]]></surname>
<given-names><![CDATA[Oscar]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ramírez-Fuentes]]></surname>
<given-names><![CDATA[Silvestre]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Carrillo-Sánchez]]></surname>
<given-names><![CDATA[Silvia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Vargas-Alarcón]]></surname>
<given-names><![CDATA[Gilberto]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fragoso]]></surname>
<given-names><![CDATA[José Manuel]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Nacional de Medicina Genómica Laboratorio de Inmunogenómica y Enfermedades Metabólicas ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Grupo de Estudio en Genómica y Proteómica de Enfermedades Cardiovasculares Departamento de Biología Molecular]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Instituto Nacional de Cardiología Ignacio Chávez Grupo de Estudio en Genómica y Proteómica de Enfermedades Cardiovasculares Departamento de Biología Molecular]]></institution>
<addr-line><![CDATA[México D. F.]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>09</month>
<year>2011</year>
</pub-date>
<volume>81</volume>
<numero>3</numero>
<fpage>240</fpage>
<lpage>250</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-99402011000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-99402011000300013&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-99402011000300013&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La hipertensión arterial es considerada la principal causa de riesgo para el desarrollo de infarto agudo al miocardio, falla cardiaca, arritmia ventricular, nefropatía, ceguera, entre otras. La hipertensión arterial es una enfermedad multifactorial en la que participan factores ambientales, genéticos e intrínsecos como raza y género. La Organización Mundial de la Salud ha estimado que la prevalencia de la hipertensión se incrementará drásticamente, de modo que en la próxima década será la primera causa de muerte a nivel mundial, debido al elevado número de muertes (17.5 millones) por enfermedades cardiovasculares registradas a nivel mundial. No obstante, los datos publicados en la Encuesta Nacional de la Secretaría de Salud en 2006, señalan aproximadamente 17 millones de hipertensos en población adulta y una prevalencia de 30.8%, cifra que indica que la hipertensión arterial aumentó su morbilidad del año 2000 al 2005. Sin embargo, poco se ha logrado en la comprensión de los mecanismos moleculares y genéticos involucrados en el desarrollo de esta patología y en consecuencia su prevalencia sigue aumentando drásticamente. Con el uso de las nuevas tecnologías para el análisis de las variantes en el genoma, se han identificado algunos genes en diferentes loci que confieren susceptibilidad al desarrollo de hipertensión arterial. La finalidad de esta revisión es hacer una comparación entre los diferentes estudios en genética y genómica relacionados con esta patología a nivel mundial y en nuestro país, con la finalidad de identificar genes clave que participen en la susceptibilidad al desarrollo de la hipertensión arterial.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The arterial hypertension is considered to be the main risk factor for myocardial infarction, heart failure, ventricular arrhythmias, kidney failure, blindness and other diseases. Arterial hypertension is a multifactorial disease derived from environmental, genetic, gender and ethnic factors. In recent years, the World Health Organization estimated that approximately 17.5 million of deaths were due to cardiovascular diseases worldwide and that this pathology will become the leading cause of death in the next decade. Data from the National Survey of Mexican Ministry of Health (2006), reported approximately 17 million hypertensive adults, equivalent to a prevalence of 30.8% among Mexican population. As a consequence, hypertension represents the leading cause of morbidity from 2000 to 2005 and is increasing in recent years. However, studies have failed to clearly identify the molecular and genetic mechanisms of this pathology so far. Nevertheless, using the new technologies for analysis of variants in the genome, several genes in different loci that confer susceptibility to develop hypertension have been identified. In this review we compared the different studies in genetics and genomics of the hypertension that have been made worldwide and in Mexico, with the aim of identifying important genes involved in susceptibility to the development of this pathology.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Hipertensión arterial]]></kwd>
<kwd lng="es"><![CDATA[Genética]]></kwd>
<kwd lng="es"><![CDATA[Genómica]]></kwd>
<kwd lng="es"><![CDATA[México]]></kwd>
<kwd lng="en"><![CDATA[Arterial hypertension]]></kwd>
<kwd lng="en"><![CDATA[Genetic]]></kwd>
<kwd lng="en"><![CDATA[Genomic]]></kwd>
<kwd lng="en"><![CDATA[Mexico]]></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>Gen&eacute;tica y gen&oacute;mica de la hipertensi&oacute;n arterial: una actualizaci&oacute;n</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="3"><b>Genetic and genomic studies in the hypertension: an actualization</b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="center"><font face="verdana" size="2"><b>Juli&aacute;n Ram&iacute;rez&#150;Bello,<sup>1</sup> Oscar P&eacute;rez&#150;M&eacute;ndez,<sup>2</sup> Silvestre Ram&iacute;rez&#150;Fuentes,<sup>2</sup> Silvia Carrillo&#150;S&aacute;nchez,<sup>2</sup> Gilberto Vargas&#150;Alarc&oacute;n,<sup>2</sup> Jos&eacute; Manuel Fragoso<sup>2</sup></b></font></p>     <p align="center"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><i><sup>1 </sup>Laboratorio de Inmunogen&oacute;mica y Enfermedades Metab&oacute;licas, Instituto Nacional de Medicina Gen&oacute;mica. M&eacute;xico, D. F.</i> </font></p>      <p align="justify"><font face="verdana" size="2"><i><sup>2 </sup>Departamento de Biolog&iacute;a Molecular. Grupo de Estudio en Gen&oacute;mica y Prote&oacute;mica de Enfermedades Cardiovasculares. Instituto Nacional de Cardiolog&iacute;a Ignacio Ch&aacute;vez. Tlalpan, M&eacute;xico, D. F.</i></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>Correspondencia:    <br> </b>Jos&eacute; Manuel Fragoso.    <br> Juan Badiano N&deg;1, Tlalpan 14080,    <br> M&eacute;xico D. F.    <br> Tel&eacute;fono: (525) 5573 2911, ext: 1460.    <br> Fax: (525) 5573 0926.    <br> Correo electr&oacute;nico: <a href="mailto:mfragoso1275@yahoo.com.mx"> mfragoso1275@yahoo.com.mx</a>.</font></p>     <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2">Recibido el 24 de septiembre de 2010;    ]]></body>
<body><![CDATA[<br>   Aceptado el 31 de marzo de 2011.</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">La hipertensi&oacute;n arterial es considerada la principal causa de riesgo para el desarrollo de infarto agudo al miocardio, falla cardiaca, arritmia ventricular, nefropat&iacute;a, ceguera, entre otras. La hipertensi&oacute;n arterial es una enfermedad multifactorial en la que participan factores ambientales, gen&eacute;ticos e intr&iacute;nsecos como raza y g&eacute;nero. La Organizaci&oacute;n Mundial de la Salud ha estimado que la prevalencia de la hipertensi&oacute;n se incrementar&aacute; dr&aacute;sticamente, de modo que en la pr&oacute;xima d&eacute;cada ser&aacute; la primera causa de muerte a nivel mundial, debido al elevado n&uacute;mero de muertes (17.5 millones) por enfermedades cardiovasculares registradas a nivel mundial. No obstante, los datos publicados en la Encuesta Nacional de la Secretar&iacute;a de Salud en 2006, se&ntilde;alan aproximadamente 17 millones de hipertensos en poblaci&oacute;n adulta y una prevalencia de 30.8%, cifra que indica que la hipertensi&oacute;n arterial aument&oacute; su morbilidad del a&ntilde;o 2000 al 2005. Sin embargo, poco se ha logrado en la comprensi&oacute;n de los mecanismos moleculares y gen&eacute;ticos involucrados en el desarrollo de esta patolog&iacute;a y en consecuencia su prevalencia sigue aumentando dr&aacute;sticamente. Con el uso de las nuevas tecnolog&iacute;as para el an&aacute;lisis de las variantes en el genoma, se han identificado algunos genes en diferentes <i>loci </i>que confieren susceptibilidad al desarrollo de hipertensi&oacute;n arterial. La finalidad de esta revisi&oacute;n es hacer una comparaci&oacute;n entre los diferentes estudios en gen&eacute;tica y gen&oacute;mica relacionados con esta patolog&iacute;a a nivel mundial y en nuestro pa&iacute;s, con la finalidad de identificar genes clave que participen en la susceptibilidad al desarrollo de la hipertensi&oacute;n arterial. </font></p>      <p align="justify"><font face="verdana" size="2"><b>Palabras clave: </b>Hipertensi&oacute;n arterial; Gen&eacute;tica; Gen&oacute;mica; M&eacute;xico.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Abstract</b> </font></p>      <p align="justify"><font face="verdana" size="2">The arterial hypertension is considered to be the main risk factor for myocardial infarction, heart failure, ventricular arrhythmias, kidney failure, blindness and other diseases. Arterial hypertension is a multifactorial disease derived from environmental, genetic, gender and ethnic factors. In recent years, the World Health Organization estimated that approximately 17.5 million of deaths were due to cardiovascular diseases worldwide and that this pathology will become the leading cause of death in the next decade. Data from the National Survey of Mexican Ministry of Health (2006), reported approximately 17 million hypertensive adults, equivalent to a prevalence of 30.8% among Mexican population. As a consequence, hypertension represents the leading cause of morbidity from 2000 to 2005 and is increasing in recent years. However, studies have failed to clearly identify the molecular and genetic mechanisms of this pathology so far. Nevertheless, using the new technologies for analysis of variants in the genome, several genes in different loci that confer susceptibility to develop hypertension have been identified. In this review we compared the different studies in genetics and genomics of the hypertension that have been made worldwide and in Mexico, with the aim of identifying important genes involved in susceptibility to the development of this pathology. </font></p>      <p align="justify"><font face="verdana" size="2"><b>Keywords: </b>Arterial hypertension; Genetic; Genomic; Mexico.</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">La hipertensi&oacute;n arterial esencial (HTA, como se abordar&aacute; en este texto) es una enfermedad multifactorial en la que participan factores ambientales, gen&eacute;ticos e intr&iacute;nsecos como raza y g&eacute;nero en su desarrollo.<sup>1&#150;4</sup> La HTA se define como una elevaci&oacute;n de la presi&oacute;n sist&oacute;lica igual o mayor a 140 mmHg, as&iacute; como una elevaci&oacute;n de la presi&oacute;n arterial diast&oacute;lica igual o mayor de 90 mmHg. De hecho, un incremento incluso dentro del rango normal de la presi&oacute;n sist&oacute;lica y diast&oacute;lica tienen impacto continuo sobre enfermedades cardiovasculares.<sup>5,6</sup> En 2005, la Organizaci&oacute;n Mundial de la Salud estim&oacute; que la mortalidad debida a enfermedades cardiovasculares fue de aproximadamente 17.5 millones a nivel mundial.<sup>5</sup> En la Encuesta Nacional de Salud 2006 del Instituto Nacional de Salud P&uacute;blica de M&eacute;xico, se document&oacute; la estimaci&oacute;n de 17 millones de hipertensos en poblaci&oacute;n adulta, cifra con la que se alcanza la prevalencia de 30.8%, que ubica a la HTA como una de las principales causas de morbi&#150;mortalidad en nuestro pa&iacute;s.<sup>7</sup> As&iacute;, la HTA es el principal factor de riesgo para el desarrollo de infarto agudo al miocardio, falla cardiaca, arritmia ventricular, nefropat&iacute;as, ceguera, entre otros serios problemas de salud. Aunque la HTA es una de las enfermedades m&aacute;s comunes a nivel mundial, poco se ha logrado en la comprensi&oacute;n sobre cu&aacute;l o cu&aacute;les son los mecanismos moleculares y gen&eacute;ticos involucrados en su desarrollo. Sin embargo, en las recientes d&eacute;cadas se ha observado que el estilo de vida, sobrepeso, obesidad e inactividad f&iacute;sica, en conjunto con otros factores como la ingesta elevada de sal en la dieta, adicci&oacute;n al alcohol, el g&eacute;nero, entre otros que contribuyen dr&aacute;sticamente en el aumento de su prevalencia.<sup>5,8&#150;10</sup> No obstante, la HTA involucra otros eventos muy importantes en su fisiopatogenia, como la disfunci&oacute;n endotelial, el proceso infamatorio y los factores gen&eacute;ticos. </font></p>      <p align="justify"><font face="verdana" size="2">Se ha estimado que el componente gen&eacute;tico es muy importante para su desarrollo, de hecho varios estudios de heredabilidad muestran que entre 30% a 60% depende del componente gen&eacute;tico para que se desarrolle HTA.<sup>1,2&#150;11 </sup>Recientemente, con el uso de la tecnolog&iacute;a de an&aacute;lisis de variantes gen&eacute;ticas del genoma completo, se han identificado diferentes <i>loci </i>que confieren susceptibilidad a desarrollar HTA.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Objetivo</b> </font></p>      <p align="justify"><font face="verdana" size="2">Discutir los trabajos de gen&eacute;tica y gen&oacute;mica en HTA que se han realizado tanto a nivel mundial como en nuestro pa&iacute;s; estos estudios permitir&aacute;n identificar aquellos genes que participan en la etiopatogenia de esta enfermedad. De esta manera, en el futuro se pretende que la HTA se pueda prevenir y que estas herramientas moleculares nos ayuden a establecer el diagn&oacute;stico y pron&oacute;stico m&aacute;s certeros, convirtiendo as&iacute; a la gen&oacute;mica en una herramienta para hacer una medicina m&aacute;s personalizada e individualizada.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Estrategias gen&eacute;ticas y gen&oacute;micas en la b&uacute;squeda de genes involucrados en la susceptibilidad para desarrollar HTA</b> </font></p>      <p align="justify"><font face="verdana" size="2">Los estudios en familias han detectado que el componente gen&eacute;tico es muy importante en el desarrollo de la HTA; varias publicaciones han puesto en evidencia que los genes juegan un papel principal en su desarrollo; el car&aacute;cter hereditario llega a exceder 50%.<sup>1&#150;2,11,12</sup> Otros estudios que apoyan estos datos, son los realizados en gemelos concordantes (monocigotos) y discordantes (dicigotos), con quienes se ha mostrado tambi&eacute;n que el componente gen&eacute;tico est&aacute; fuertemente ligado a la HTA.<sup>13</sup> Se ha calculado que el riesgo relativo (&#955;<sub>s</sub>) en pares de hermanos afectados es de 3.5 veces mayor riesgo para hipertensi&oacute;n que el &#955;<sub>s</sub> de la enfermedad arterial isqu&eacute;mica (&#955;<sub>s</sub> = 2).<sup>12 </sup>Actualmente, los estudios gen&eacute;ticos se est&aacute;n enfocando a buscar los diferentes genes que pueden participar en la etiopatolog&iacute;a de la HTA, lo cual, en el futuro, podr&iacute;a tener fuertes implicaciones diagn&oacute;sticas y pron&oacute;sticas en esta patolog&iacute;a multifactorial. </font></p>      <p align="justify"><font face="verdana" size="2">Existen dos estrategias principales para identificar genes de susceptibilidad a HTA en humanos: a) los an&aacute;lisis de ligamiento y, b) los an&aacute;lisis de asociaci&oacute;n. Ambas estrategias han sido ampliamente usadas con el objetivo de identificar a los genes que causan HTA.<sup>14</sup> Estas estrategias no son mutuamente excluyentes y cada una presenta ventajas y desventajas.</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>An&aacute;lisis de ligamiento</b> </font></p>      <p align="justify"><font face="verdana" size="2">El ligamiento gen&eacute;tico se refiere a la co&#150;segregaci&oacute;n de marcadores gen&eacute;ticos con el fenotipo de la enfermedad, por ejemplo HTA en familias con m&uacute;ltiples miembros afectados.<sup>14</sup> De esta manera, se puede analizar la co&#150;segregaci&oacute;n de marcadores gen&eacute;ticos ampliamente distribuidos sobre todo el genoma, tales como los repetidos cortos en t&aacute;ndem (<i>Short tandem repetitive: STRs</i>) y los polimorfismos de un s&oacute;lo nucle&oacute;tido (<i>single nucleotide polymorphisms: SNPs</i>) con HTA; finalmente, se identifican los <i>loci </i>que contienen marcadores gen&eacute;ticos que son cosegregados junto con la HTA en diferentes familias (<b><a href="#f1">Figura 1</a></b>).<sup>14,15</sup> En los &uacute;ltimos a&ntilde;os, en los an&aacute;lisis cl&aacute;sicos de escaneo del ligamiento del genoma completo (<i>Genome&#150;wide likage scan: GWLS</i>) se utilizaban marcadores gen&eacute;ticos tipo STRs, los cuales tienen la caracter&iacute;stica de ser muy informativos; sin embargo, su distribuci&oacute;n dentro del genoma no es tan amplia como los SNPs (se ha calculado que existen entre 10 y 20 millones), hasta hoy no hay estudios de ligamiento con este tipo de polimorfsmos en HTA.<sup>16&#150;18 </sup></font></p>      <p align="justify"><font face="verdana" size="2">Una de las principales ventajas que presentan los an&aacute;lisis de ligamiento en HTA es el an&aacute;lisis con variantes comunes en el genoma completo; esto nos da en primer lugar la identificaci&oacute;n de diferentes <i>loci </i>involucrados en HTA en todo el genoma, en segundo lugar, nos sirve para realizar un mapeo gen&eacute;tico m&aacute;s detallado con polimorfismos m&aacute;s comunes. Entre las principales desventajas que presenta esta estrategia, est&aacute; su bajo poder estad&iacute;stico, debido a la dificultad que implica obtener a un gran n&uacute;mero de familias, entre 200 o 300 y con m&uacute;ltiples casos afectados con HTA. Adem&aacute;s, la HTA es una enfermedad multifactorial en la que participan varios genes de susceptibilidad de baja penetrancia. A diferencia de las enfermedades monog&eacute;nicas, en las que un solo gen es el responsable del desarrollo de la patolog&iacute;a debido a su alta penetrancia, en las enfermedades multifactoriales hay m&uacute;ltiples genes de baja penetrancia y no hay un patr&oacute;n de herencia bien definido. Por lo anterior, en las enfermedades complejas como la HTA los estudios de ligamiento han tenido poco &eacute;xito para definir cu&aacute;les son los genes involucrados en su fisiopatolog&iacute;a.<sup>19,20</sup> </font></p>     <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/acm/v81n3/a13f1.jpg"> </font></p>      <p align="justify"><font face="verdana" size="2">Los GWLS han identificado varias regiones gen&oacute;micas con un <i>LOD score </i>(logaritmo con base en diez de las probabilidades) mayor a tres (este valor se toma como evidencia de ligamiento y se dice que el <i>locus </i>tiene un ligamiento de 1000 veces a uno respecto a la enfermedad) que est&aacute;n involucradas con HTA, estas incluyen a los siguientes <i>loci</i>: 1q42, 2p22.1, 5q33.3, 6q23, 15q25.1, y 17q12&#150;21 entre otros (<b><a href="#t1">Tabla 1</a></b>).<sup>14,21&#150;23</sup> Una vez confirmado el ligamiento, la b&uacute;squeda del o de los genes candidato debe iniciarse, en general las regiones ligadas a enfermedades comunes como la HTA son grandes, a veces se tiene que buscar un solo gen en 20 a 30 millones de pb, en esta densidad de nucle&oacute;tidos com&uacute;nmente puede haber m&aacute;s de 500 genes.<sup>15</sup> Entonces &iquest;c&oacute;mo se pueden buscar genes en una regi&oacute;n tan grande? Inicialmente se busca en diversas bases de datos cuales genes est&aacute;n ubicados en la regi&oacute;n de ligamiento y cu&aacute;l de ellos es un buen gen candidato (gen que codifica una prote&iacute;na que por su funci&oacute;n biol&oacute;gica puede estar relacionado con la enfermedad);<sup>24</sup> por ejemplo, la primera regi&oacute;n de ligamiento involucrada con HTA fue la 1q42, aqu&iacute; se identific&oacute; un marcador <i>r&iacute;o abajo </i>del gen de angiotensin&oacute;geno (<i>AGT</i>), que desempe&ntilde;a un papel fundamental en la regulaci&oacute;n de la presi&oacute;n arterial a trav&eacute;s del sistema renina angiotensina y que se ha asociado con HTA.<sup>21</sup> Otra regi&oacute;n ligada a HTA es la 5q33.3, en esta regi&oacute;n hay una gran cantidad de genes, sin embargo, cuatro de ellos son fuertes candidatos a ser analizados con polimorfismos m&aacute;s comunes como los SNPs, estos genes son <i>IL12B </i>y <i>IL17B </i>(ambos involucrados en eventos inflamatorios), <i>ADAM19 </i>(metaloproteasa involucrada en la adhesi&oacute;n celular y transducci&oacute;n de se&ntilde;ales) y <i>FABP6 </i>(la cual tiene un papel importante en la uni&oacute;n a &aacute;cidos grasos).</font></p>      <p align="center"><font face="verdana" size="2"><a name="t1"></a></font></p>      <p align="center"><font face="verdana" size="2"><img src="/img/revistas/acm/v81n3/a13t1.jpg"></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>An&aacute;lisis de asociaci&oacute;n</b></font></p>      <p align="justify"><font face="verdana" size="2">Este tipo de estudio se divide com&uacute;nmente en casos y controles, y los basados en familias, en el primero los casos son individuos no relacionados afectados con HTA y controles son individuos sanos no relacionados que no tienen antecedentes de HTA, los segundos, involucran a familias, espec&iacute;ficamente tr&iacute;os: progenitores y afectado.<sup>14,15</sup> El objetivo de este dise&ntilde;o de estudio es comparar frecuencias al&eacute;licas y genot&iacute;picas de la variante estudiada, y entonces observar si existe una diferencia estad&iacute;stica entre los grupos.<sup>14,15</sup> Si la variante es m&aacute;s com&uacute;n en los casos que en los controles, decimos que la variante est&aacute; asociada con susceptibilidad; si es m&aacute;s com&uacute;n en controles que en individuos afectados, entonces confiere protecci&oacute;n. En el caso de los estudios de asociaci&oacute;n basados en familias, se emplea un m&eacute;todo que se denomina an&aacute;lisis de desequilibrio de transmisi&oacute;n (<i>transmission disequilibrium test</i>: TDT), el cual compara la frecuencia con la que los padres heterocigotos transmiten un alelo espec&iacute;fico de un marcador gen&eacute;tico, por ejemplo tipo SNP al hijo afectado; si la frecuencia del alelo transmitido muestra significancia estad&iacute;stica, se dice que est&aacute; asociado con la enfermedad.<sup>14,15</sup> La gran mayor&iacute;a de estudios de asociaci&oacute;n est&aacute;n realizados en casos y controles, debido a la relativa facilidad que conlleva a reclutar a individuos no relacionados con HTA e individuos sanos sin antecedentes familiares de HTA; sin embargo, para los casos s&oacute;lo se deben colectar a aquellos que cumplan con criterios cl&iacute;nicos espec&iacute;ficos para HTA, mientras que los controles deben ser los adecuados, ya que una gran parte de ellos est&aacute;n mal evaluados, aqu&iacute; no s&oacute;lo se debe realizar un cuestionario con historia de antecedentes hereditarios de la enfermedad, deben adem&aacute;s existir otros datos cl&iacute;nicos y de laboratorio. Una mala inclusi&oacute;n y estratificaci&oacute;n de casos y controles en el estudio puede resultar en falsas asociaciones o descartar a genes que si pueden tener un efecto en la enfermedad. As&iacute;, cuando existe evidencia de una regi&oacute;n gen&oacute;mica ligada a HTA, lo que sigue es investigar cu&aacute;les genes son candidatos a estudiar en esta regi&oacute;n mediante un dise&ntilde;o de casos y controles. La elecci&oacute;n, de uno o varios SNPs en el gen candidato se pueden hacer de acuerdo a su funcionalidad de la variante dentro del gen. </font></p>      <p align="justify"><font face="verdana" size="2">Actualmente se han desarrollado nuevas metodolog&iacute;as de asociaci&oacute;n, denominadas estudios de asociaci&oacute;n amplios del genoma o estudio de asociaci&oacute;n del genoma completo (GWAS).<sup>25,26</sup> Mediante microarreglos de <i>Affymetrix </i>o <i>IIIumina </i>se pueden analizar hasta m&aacute;s de un mill&oacute;n de SNPs;<sup>25&#150;27</sup> el par&aacute;metro principal es el desequilibrio de ligamiento (<i>linkage disequilibrium</i>: LD), el cual se refiere a una asociaci&oacute;n no azarosa de alelos en dos o m&aacute;s <i>loci </i>con la enfermedad.<sup>25,28</sup> Estos mismos micro&#150;arreglos permiten adem&aacute;s analizar a otro tipo de polimorfismos en el genoma denominados variantes en el n&uacute;mero de copias (<i>copy number variants</i>: CNVs), los cuales son segmentos de DNA que tienen un tama&ntilde;o igual o mayor a 1 kb e incluyen inserciones, deleciones o duplicaciones.<sup>27,29,30 </sup>Recientemente, los estudios realizados por Tuzun y colaboradores, identificaron 241 CNVs cuando compararon dos genomas de humano.<sup>31</sup> Este tipo de variantes no han dado los resultados esperados debido a el tama&ntilde;o de sondas que identifican a los CNVs.<sup>29,32</sup> S&oacute;lo algunos CNVs han sido asociados a glomerulonefritis y artritis reumatoide. Sin embargo, estos CNVs han sido detectados mediante gen candidato y no por GWAS.<sup>33,34</sup> Hasta ahora, no se han se&ntilde;alado CNVs asociados a HTA .</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Causas de asociaci&oacute;n de los SNPs</b> </font></p>      <p align="justify"><font face="verdana" size="2">Los estudios de asociaci&oacute;n pueden presentar un efecto directo (por su localizaci&oacute;n dentro del gen puede tener un efecto en el fenotipo de la enfermedad) o indirecto (desequilibrio de ligamiento o estratificaci&oacute;n poblacional) entre el SNP analizado y la HTA. </font></p>     <blockquote>       <p align="justify"><font face="verdana" size="2"><i>1. Efecto directo del SNP. </i>El SNP puede ser el involucrado directo en conferir susceptibilidad o protecci&oacute;n a HTA, debido a que puede tener un papel biol&oacute;gico fundamental en la regulaci&oacute;n del gen, s&iacute;ntesis de la prote&iacute;na, regulaci&oacute;n de la maduraci&oacute;n, por corte y empalme o en la estabilidad del RNAm (<b><a href="/img/revistas/acm/v81n3/a13f2.jpg" target="_blank">Figura 2</a></b>).<sup>35&#150;39</sup> </font></p>        <p align="justify"><font face="verdana" size="2"><i>2. Desequilibrio de ligamiento. </i>Algunas veces se asocia un alelo con la enfermedad; sin embargo, es usual que este alelo no sea uno de los involucrados en susceptibilidad o protecci&oacute;n sino que una variante cercana o lejana ubicada en el mismo cromosoma sea la verdadera variante involucrada con la susceptibilidad (<b><a href="/img/revistas/acm/v81n3/a13f3.jpg" target="_blank">Figura 3</a></b>). Este tipo de asociaci&oacute;n se debe a LD y se puede presentar tanto en estudios de casos y controles como en los basados en familias. </font></p>        <p align="justify"><font face="verdana" size="2"><i>3. Falsas asociaciones debido a estratificaci&oacute;n poblacional. </i>En ocasiones, las asociaciones encontradas entre un marcador gen&eacute;tico y la enfermedad se deben a estratificaci&oacute;n poblacional (sub&#150;grupos de individuos con carga ancestral europea, amerindia o africana y que se presentan en diferente proporci&oacute;n en casos y controles, esto ocasiona en algunas veces que las asociaciones encontradas no sean reales). Mediante el an&aacute;lisis de un grupo de marcadores informativos de historia ancestral en casos y controles, se evita este fen&oacute;meno (<b><a href="#f4">Figura 4</a></b>). </font></p>       ]]></body>
<body><![CDATA[<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/acm/v81n3/a13f4.jpg"></font></p>       <p align="center"><font face="verdana" size="2">&nbsp;</font></p> </blockquote>     <p align="justify"><font face="verdana" size="2"><b>Estudios de asociaci&oacute;n en HTA en genes candidatos: ejemplo del sistema de regulaci&oacute;n de la presi&oacute;n sangu&iacute;nea renina&#150;angiotensina</b> </font></p>      <p align="justify"><font face="verdana" size="2">Hasta 2009, los informes sobre SNPs en genes candidatos analizados en HTA fueron pocos.<sup>40&#150;53</sup> Sin embargo, a mediados de 2010, la cantidad de publicaciones en HTA u otras enfermedades las que se manifiesta HTA, se ha incrementado dr&aacute;sticamente.<sup>54&#150;68</sup> Algunos genes que son excelentes candidatos, porque codifican a prote&iacute;nas que regulan la presi&oacute;n sangu&iacute;nea y que participan en el sistema renina&#150;angiotensina, son precisamente la enzima convertidora de angiotensina (<i>Angitiotensin&#150;converting enzime</i>: <i>ACE</i>), angiotensin&oacute;geno (<i>angiotensinogen; AGT</i>) y el receptor 1 de angiotensina II (<i>angiotensin II type 1 receptor</i>)<i>.</i><sup>14,21,40&#150;49 </sup>Aunque existe una gran cantidad de estudios en estos genes, es importante mencionar que no han sido replicados en las diferentes poblaciones de estudio, debido a un sin n&uacute;mero de variables, que incluyen tama&ntilde;o de muestra peque&ntilde;a, origen &eacute;tnico, estratificaci&oacute;n poblacional, etc&eacute;tera (<b><a href="/img/revistas/acm/v81n3/a13t2.jpg" target="_blank">Tabla </a></b><a href="/img/revistas/acm/v81n3/a13t2.jpg"><b>2</b></a>).<sup>41&#150;43,45&#150;47,57,64,66</sup> </font></p>      <p align="justify"><font face="verdana" size="2">De hecho, en tres meta&#150;an&aacute;lisis se evidenci&oacute; que el genotipo 235T/T del gen <i>AGT </i>confiere susceptibilidad a HTA, un &uacute;ltimo an&aacute;lisis mostr&oacute; que esta misma variante confiere protecci&oacute;n a HTA. Estos resultados controversiales muestran que estos polimorfismos a&uacute;n deben de estudiarse en otras poblaciones.<sup>42,43,45,47</sup> Una publicaci&oacute;n reciente document&oacute; variantes diferentes a la M235T en el gen <i>AGT </i>que muestran asociaci&oacute;n con HTA, de hecho un meta&#150;an&aacute;lisis demuestra que la variante T174M y dos variantes ubicadas en la regi&oacute;n promotora G&#150;217A y A&#150;20C se asociaron con riesgo a HTA.<sup>51</sup> De esta manera, parece que la combinaci&oacute;n de los diferentes alelos puede explicar el riesgo a desarrollar HTA, m&aacute;s que sea debido a un s&oacute;lo SNP en este gen.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Otros genes asociados a HTA</b> </font></p>      <p align="justify"><font face="verdana" size="2">Una publicaci&oacute;n reciente, con un tama&ntilde;o de muestra de 1700 casos y 1700 controles, mostr&oacute; que un tag SNP (SNP&#150;etiqueta) en el gen <i>WNK1 </i>est&aacute; asociado con riesgo a presi&oacute;n sangu&iacute;nea elevada; este mismo resultado fue apoyado cuando se ampli&oacute; la muestra a 14 451 pertenecientes a seis diferentes poblaciones (<b><a href="/img/revistas/acm/v81n3/a13t2.jpg" target="_blank">Tabla 2</a></b>); &eacute;ste y otros informes apoyan la evidencia de que este gen es sumamente importante en el desarrollo de la HTA, de hecho cuando el mismo sufre de algunas mutaciones, causa pseudo&#150;hipoaldosteronismo, una rara enfermedad mendeliana que se caracteriza por presentar HTA e hipercalemia.<sup>4849</sup> Otros genes que se han asociado con HTA son los que codifican para el &oacute;xido n&iacute;trico sintasa endotelial <i>(endothelial nitric oxide synthase; eNOS), </i>factor de necrosis tumoral&#150;alfa <i>(tumour necrosis factor&#150;alpha; TNF&#150;&#945;), </i>interleucina&#150;6 <i>(in&#150;terleukine&#150;6; IL&#150;6), </i>entre otros;<sup>53, 57, 64&#150;66</sup> por ejemplo, se ha observado que un SNP ubicado en la subunidad &#946;3 de la prote&iacute;na G (825C/T) y uno en el gen que codifica al receptor 2 de quimiocinas (190G/A) han sido asociados con susceptibilidad en varones en poblaci&oacute;n Japonesa, mientras que la variante &#150;238G/A de <i>TNF&#150;&#945; </i>se ha asociado en mujeres.<sup>46</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>Estudios de asociaci&oacute;n del genoma completo en HTA</b> </font></p>      <p align="justify"><font face="verdana" size="2">Actualmente, en pa&iacute;ses desarrollados se han implementado los GWAS mediante micro arreglos de SNPs, estos ensayos sirven para identificar genes asociados a HTA a trav&eacute;s del estudio de variantes comunes distribuidas en todo el genoma. Los primeros dos GWAS fueron realizados en 2007 por <i>The Framingham Heart Study </i>(FHS) y por el <i>Wellcome Trust Case Control Consortium </i>(WTCCC); sin embargo, la ausencia de asociaciones significativas (los valores <i>p </i>no fueron estad&iacute;sticamente significativos; <i>p &lt;</i>5x10<sup>&#150;8</sup>, valor m&iacute;nimo necesario para realizar m&uacute;ltiples correcciones) en estos estudios, ocasion&oacute; grandes cuestionamientos acerca de la utilidad de esta metodolog&iacute;a en la HTA.<sup>69&#150;71</sup> El principal problema presentado en el primer estudio fue la incorrecta selecci&oacute;n de los controles, ya que no se tomaron los par&aacute;metros adecuados en la evaluaci&oacute;n de la presi&oacute;n sangu&iacute;nea que se encuentra com&uacute;nmente en individuos aparentemente sanos, este grupo de controles adem&aacute;s fue com&uacute;n para siete enfermedades comunes. En el segundo estudio, el an&aacute;lisis se realiz&oacute; mediante el micro arreglo 100 K, que tiene poca cobertura en el genoma debido a que el chip incluye aproximadamente 100 000 SNPs y no 300 000 como el que utiliz&oacute; el WTCCC. Un problema com&uacute;n de ambos estudios, fue la no replicaci&oacute;n de asociaci&oacute;n del gen <i>WNK1, </i>en el cual previamente se hab&iacute;a identificado que una sola mutaci&oacute;n produc&iacute;a pseudo&#150;hipoaldosteronismo.<sup>48,49,52</sup> El   problema   radic&oacute; en que ambos micro arreglos carecieron de Tag SNPs que cubrieran la regi&oacute;n del gen <i>WNK1</i>, adem&aacute;s, otro problema que presentan los GWAS es la no detecci&oacute;n de SNPs con una frecuencia mayor a 5%, de manera que no detectan SNP con frecuencias bajas,<sup>72</sup> y en algunas ocasiones estas variantes participan en el desarrollo de las enfermedades. A pesar de los resultados nada alentadores, en el primer estudio algunos SNPs ubicados en los genes <i>ADAMTSL3, CDH13, CCL20, WDR69 </i>mostraron un valor cercano a la asociaci&oacute;n con presi&oacute;n sist&oacute;lica y diast&oacute;lica. Mientras, que en el segundo GWAS no se identificaron SNPs en genes previamente asociados con HTA y tampoco se identificaron nuevos SNPs asociados con esta patolog&iacute;a.<sup>11,69&#150;72</sup> Otros 10 GWAS posteriores, no mostraron asociaci&oacute;n entre <i>WNK1 </i>y HTA, pero s&iacute; identificaron SNPs asociados en los siguientes genes: <i>CDH13</i>, <i>STK39</i>, <i>LOC344371</i>, <i>RASGRP3</i>, <i>IMPG1</i>, <i>PMS1</i>, <i>SLC24A4</i>, <i>YWHA7</i>, <i>IPO7</i>, entre otros (<b><a href="#f5">Figura 5</a></b>).<sup>73&#150;82</sup> </font></p>     <p align="center"><font face="verdana" size="2"><a name="f5"></a> </font></p>     <p align="center"><sup><img src="/img/revistas/acm/v81n3/a13f5.jpg"></sup> </font></p>      <p align="justify"><font face="verdana" size="2">Recientemente, Newton y colaboradores, as&iacute; como Levy y colaboradores, publicaron dos GWAS con resultados muy robustos, basados principalmente en el gran n&uacute;mero de muestras que analizaron (por arriba de 30 mil individuos) y a los valores de <i>p </i>obtenidos (<i>p </i>&lt;5X10<sup>&#150;8</sup>).<sup>81,82</sup> Newton y colaboradores, identificaron a ocho <i>loci </i>asociados con presi&oacute;n sist&oacute;lica o diast&oacute;lica que comprenden a los genes que se enlistan en la <b><a href="/img/revistas/acm/v81n3/a13t3.jpg" target="_blank">Tabla 3</a></b>. Algunos genes fuertemente asociados a HTA son <i>CYP17A1, CYP1A2, FGF5, SH2B3</i>.<sup>81</sup> Por otro lado, Ledy y colaboradores identificaron cuatro genes que se asociaron fuertemente a presi&oacute;n sist&oacute;lica, <i>ATP2B1, CYP17A1, PLEKHA7 </i>y <i>SH2B3 </i>y seis genes asociados con presi&oacute;n diast&oacute;lica, <i>SH2B3, CSK&#150;ULK3, ULK4, ATP2B1, CAC&#150;NB2, TBX3&#150;TBX5 </i>y uno para hipertensi&oacute;n, ATP2B1.<sup>82</sup> </font></p>      <p align="justify"><font face="verdana" size="2">De las variantes encontradas asociadas con HTA, s&oacute;lo dos genes se comparten en ambos estudios, <i>CYP17A1 </i>y <i>SH2B3</i>. El gen <i>CYP17A1 </i>codifica para una enzima del citocromo P450, que puede regular el tono vascular perif&eacute;rico y la presi&oacute;n sangu&iacute;nea.<sup>83</sup> Este gen ha sido asociado con una forma rara de hipertensi&oacute;n que segrega de manera mendeliana. Por lo anterior, los SNPs del mismo se convierten en candidatos para futuros estudios de casos y controles. Por otro lado, el gen <i>SH2B3 </i>codifica para una prote&iacute;na adaptadora de linfocitos; este SNP que result&oacute; asociado a presi&oacute;n diast&oacute;lica, se encuentra en el ex&oacute;n tres y cambia al amino&aacute;cido arginina por tript&oacute;fano (R262W) en la prote&iacute;na. Este gen se expresa en c&eacute;lulas precursoras hematopoy&eacute;ticas y en c&eacute;lulas endoteliales.<sup>84</sup> Ratones <i>knockout </i>para <i>SH2B3 </i>muestran disminuci&oacute;n en los progenitores hematopoy&eacute;ticos, sugiriendo que el alelo de menor frecuencia <i>(Minor al&iacute;ele frequency: MAF) </i>resulte en la p&eacute;rdida de la funci&oacute;n de <i>SH2B3.<sup>85</sup> </i>Se ha observado que en respuesta a est&iacute;mulos infamatorios, <i>SH2B3 </i>regula negativamente la transducci&oacute;n de se&ntilde;ales en c&eacute;lulas endoteliales, un tipo celular que juega un papel fundamental en la regulaci&oacute;n de la presi&oacute;n sangu&iacute;nea y aterosclerosis. Un tercer gen que se asoci&oacute; fuertemente a esta patolog&iacute;a fue <i>FGF5, </i>este gen codifica a una prote&iacute;na involucrada en la proliferaci&oacute;n y crecimiento de diversos tipos celulares incluyendo a cardiomiocitos, &eacute;ste adem&aacute;s se ha asociado a angiog&eacute;nesis.<sup>86</sup> Cabe aclarar que estos genes identificados mediante GWAS han sido replicados en diversas poblaciones.<sup>87</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>Estudios gen&eacute;ticos en enfermedades cardiovasculares en M&eacute;xico</b> </font></p>      <p align="justify"><font face="verdana" size="2">En nuestro pa&iacute;s, no hay datos de que se&ntilde;alen estudios gen&eacute;ticos y gen&oacute;micos en esta enfermedad tan prevalente y de consecuencias mortales. Sin embargo, algunos estudios realizados en el Instituto Nacional de Cardiolog&iacute;a han arrojado una serie de datos de asociaci&oacute;n entre polimorfismos y diversas enfermedades cardiovasculares que incluyen a la enfermedad arterial coronaria, cardiopat&iacute;a dilatada idiop&aacute;tica, cardiopat&iacute;a reum&aacute;tica inactiva. Algunos genes analizados y que han mostrado que juegan un papel importante en el desarrollo de estas patolog&iacute;as son <i>HLA&#150;DR, HLA&#150;DQ, TNF&#150;a, </i>entre otros.<sup>90</sup> Por otro lado, la variante del tipo inserci&oacute;n/deleci&oacute;n en el gen <i>ACE </i>se asoci&oacute; a presi&oacute;n sangu&iacute;nea sist&oacute;lica<sup>91</sup> en mexicoamericanos. </font></p>      <p align="justify"><font face="verdana" size="2">Por otro lado, se analizaron tres polimorfismos que incluyen al &#150;786T/C, Glu298Asp y un repetido en t&aacute;ndem de n&uacute;mero variable <i>(Variable number tandem repeat: VN&#150;TRs) </i>de 27 pb ubicado en el intr&oacute;n 4 del gen &oacute;xido n&iacute;trico sintasa endotelial, aunque el an&aacute;lisis no reflejo una asociaci&oacute;n con HTA o presi&oacute;n sangu&iacute;nea sist&oacute;lica o diast&oacute;lica, las variantes &#150;786T/C y el VNTR se asociaron con niveles de triglic&eacute;ridos y alb&uacute;mina&#150;creatinina, respectivamente.<sup>92 </sup>Uno de estos polimorfismos, el Glu298Asp fue tambi&eacute;n analizado en poblaci&oacute;n mexicana con infarto del miocardio (IAM) con elevaci&oacute;n ST, y se encontr&oacute; una asociaci&oacute;n entre el polimorfismo y la enfermedad.<sup>93</sup> Por otro lado, se analiz&oacute; el SNP 677C/T del gen MTHFR que codifica a la 5&#150;10 metilen&#150;tetrahidrofolato reductasa en individuos con IAM con elevaci&oacute;n ST y no se encontr&oacute; asociaci&oacute;n entre casos y controles.<sup>94</sup> Por otra parte, Meaney (datos no publicados) investigaron un polimorfismo inserci&oacute;n/deleci&oacute;n ubicada en el intr&oacute;n 16 del gen <i>ACE </i>en THA sin encontrar ninguna asociaci&oacute;n entre el polimorfsmo y la enfermedad.<sup>95</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>Perspectivas en el tratamiento cl&iacute;nico y la funcionalidad biol&oacute;gica de los SNPs en HTA</b> </font></p>      <p align="justify"><font face="verdana" size="2">Los GWAS y de genes candidato en HTA han dado evidencia acerca de polimorfismos asociados a esta patolog&iacute;a; sin embargo, es necesario realizar estudios de replicaci&oacute;n en las diferentes poblaciones, incluyendo a la nuestra para saber si &eacute;stos causan susceptibilidad. Es bien conocido que entre las poblaciones existe una gran heterogeneidad gen&eacute;tica, esto trae la posibilidad que SNPs asociados en esta patolog&iacute;a en poblaciones cauc&aacute;sicas no se repliquen en hispanas, africanas u otras. Se debe adem&aacute;s evaluar la correlaci&oacute;n entre genotipos y el aspecto cl&iacute;nico y de tratamiento, por ejemplo, com&uacute;nmente la inserci&oacute;n/deleci&oacute;n ubicado en el intr&oacute;n 15 de <i>ACE </i>se ha asociado a HTA en diversas poblaciones, algunos f&aacute;rmacos han sido evaluados tomando en cuenta a este polimorfismo; sin embargo, los resultados no correlacionan entre variante y respuesta al tratamiento.<sup>96</sup> Entonces, es posible que estas variantes asociadas est&eacute;n en LD con otra variante que causa susceptibilidad y que a&uacute;n no han sido identificadas. Recientemente, en este mismo gen <i>ACE </i>se analiz&oacute; el efecto de tres polimorfsmos ubicados en el promotor y se observ&oacute; que estos alteran los niveles de expresi&oacute;n, esto correlacion&oacute; con respuesta al tratamiento a inhibidores de ACE y &#946;&#150;bloquedores.<sup>97</sup> Por otro lado, es necesario evaluar el efecto funcional de los SNPs ubicados en los intrones, exones, promotores, 5' y 3' UTRs, <i>enhancer, </i>etc&eacute;tera, en los diversos genes asociados a esta patolog&iacute;a, de esta manera podremos determinar la relevancia biol&oacute;gica dentro de una c&eacute;lula, tejido u organismo entero y ver su efecto en el fenotipo hipertenso.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Conclusi&oacute;n</b> </font></p>      <p align="justify"><font face="verdana" size="2">A pesar de que en las &uacute;ltimas d&eacute;cadas se han identificado variantes gen&eacute;ticas asociadas con la HTA, estos estudios han sido poco replicados en las diferentes poblaciones debido a diversos problemas, que incluyen el planteamiento del problema, tama&ntilde;o de muestra, bajo poder estad&iacute;stico, estrategia de estudio, estructura de poblaci&oacute;n, etc. A&uacute;n as&iacute; se ha hecho un gran esfuerzo para identificar las variantes gen&eacute;ticas que est&aacute;n implicadas en la etiolog&iacute;a de la HTA y de las enfermedades cardiovasculares. Recientemente se ha desarrollado una estrategia nueva que incluye estudiar ampliamente o completamente el genoma mediante micro arreglos de SNPs. Desafortunadamente este tipo de tecnolog&iacute;a no se ha aplicado en la mayor&iacute;a de pa&iacute;ses en v&iacute;as de desarrollo debido a su elevado costo y al n&uacute;mero de muestras que se requieren para obtener datos contundentes. Es importante hacer notar que los estudios de GWAS son relativamente nuevos en las enfermedades multifactoriales, donde se incluye a la HTA. Sin embargo, este tipo de an&aacute;lisis nos muestra un panorama general acerca de las variantes en el genoma asociadas con ciertas caracter&iacute;sticas, como la presi&oacute;n sist&oacute;lica o diast&oacute;lica altas o HTA. Es importante mencionar que aunque parece que estamos en una etapa donde estos estudios de GWAS parecen resolver todo, no es as&iacute; debido a que tambi&eacute;n presentan varios inconvenientes como bajo desequilibrio de ligamiento en varias regiones del genoma, adem&aacute;s de no capturar SNPs con una frecuencia menor a 5%, y en algunas ocasiones estas variantes s&iacute; participan en el desarrollo de la enfermedad. As&iacute;, la completa identificaci&oacute;n de los factores gen&eacute;ticos de riesgo en HTA tendr&aacute; en un futuro no muy lejano un gran potencial en el desarrollo de nuevos m&eacute;todos de diagn&oacute;stico, tratamiento y predicci&oacute;n de la enfermedad.</font></p>      <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>     <p align="justify"><font face="verdana" size="2"><b>Referencias</b> </font></p>      <!-- ref --><p align="justify"><font face="verdana" size="2">1. Vargas&#150;Alarc&oacute;n G. Physiopathogenesis of hypertension. 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