<?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>0185-3325</journal-id>
<journal-title><![CDATA[Salud mental]]></journal-title>
<abbrev-journal-title><![CDATA[Salud Ment]]></abbrev-journal-title>
<issn>0185-3325</issn>
<publisher>
<publisher-name><![CDATA[Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0185-33252014000100010</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[La genética del trastorno antisocial de la personalidad: Una revisión de la bibliografía]]></article-title>
<article-title xml:lang="en"><![CDATA[Genetics of antisocial personality disorder: review of the literature]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Holguín Mendoza]]></surname>
<given-names><![CDATA[Tomás Efrén]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Palacios Casados]]></surname>
<given-names><![CDATA[Juan Jorge]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Instituto Mexicano del Seguro Social Centro Médico Nacional Siglo XXI Hospital de Especialidades Dr. Bernardo Sepúlveda]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Instituto Nacional de Psiquiatría Ramón de la Fuente Muñiz Clínica de Genética Psiquiátrica ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>02</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>02</month>
<year>2014</year>
</pub-date>
<volume>37</volume>
<numero>1</numero>
<fpage>83</fpage>
<lpage>91</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S0185-33252014000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S0185-33252014000100010&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S0185-33252014000100010&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="en"><p><![CDATA[The antisocial personality disorder (ASPD) is characterized by an incapacity for an individual to adapt himself or herself to the social norms. These social norms are extremely important because they govern many aspects of behavior during adolescence and adulthood. Patients with ASPD typically have irritability problems and aggressive feelings toward other people. These aggressive feelings toward other people are expressed in a context of threat and intimidation. The ASPD is less common in clinical settings comparing the total population, in which the prevalence is 1.1. The familial aggregation for ASPD has been registered, in which the 40-50% of the variance can be explained to genetic influences. Most of the studies of ASPD in molecular genetics have been applying the hypothesis of association of candidate genes, focusing on genes associated with neurotransmission pathways. This has been greatly relevant to the monoamine oxidase gene (MAO). Genes that promote specific behavior between individuals must have been selected through the process of natural selection. Aggressive behaviors and other types of behavior that have an evolutionary origin are similar in the fact that they have to be codified in the genes and will later be transmitted to their descendants.]]></p></abstract>
<abstract abstract-type="short" xml:lang="es"><p><![CDATA[El trastorno antisocial de la personalidad (TAP) consiste en una incapacidad para adaptarse a las normas sociales que habitualmente rigen numerosos aspectos de la conducta de las personas en la adolescencia y la edad adulta. Los pacientes con TAP característicamente tienen problemas de irritabilidad y sentimientos agresivos hacia los demás, los cuales se expresan en el contexto de la amenaza o la intimidación. El TAP es menos común en la clínica comparándolo con la población general en la que se reporta una prevalencia media del 1.1. Se ha registrado una agregación familiar para el TAP en la que el 40-50% de la varianza puede ser explicada por influencias genéticas. La mayoría de los estudios de genética molecular en el TAP se han realizado utilizando la hipótesis basada en los estudios de asociación con genes candidatos, enfocándose en los genes relacionados a vías de neurotransmisión, siendo uno de los más relevantes, hasta el momento, el gen para la monoamino oxidasa (MAOA). Aquellos genes que promueven que cierta conducta exista entre los individuos debieron haberse elegido a través del proceso de la selección natural. De manera similar a otros comportamientos que tienen orígenes evolutivos, los comportamientos agresivos también deben ser codificados en los genes, que a la postre serán transmitidos a la descendencia.]]></p></abstract>
<kwd-group>
<kwd lng="en"><![CDATA[Antisocial personality disorder]]></kwd>
<kwd lng="en"><![CDATA[cuantitative genetics]]></kwd>
<kwd lng="en"><![CDATA[molecular genetics]]></kwd>
<kwd lng="es"><![CDATA[Trastorno antisocial de la personalidad]]></kwd>
<kwd lng="es"><![CDATA[genética cuantitativa]]></kwd>
<kwd lng="es"><![CDATA[genética molecular]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	    <p align="justify"><font face="verdana" size="4">Actualizaci&oacute;n por temas</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="4"><b>La gen&eacute;tica del trastorno antisocial de la personalidad: Una revisi&oacute;n de la bibliograf&iacute;a</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="3"><b>Genetics of antisocial personality disorder: review of the literature</b></font></p>  	    <p align="center"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="center"><font face="verdana" size="2"><b>Tom&aacute;s Efr&eacute;n Holgu&iacute;n Mendoza,<sup>1</sup> Juan Jorge Palacios Casados<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"><sup><i>1</i></sup><i> Hospital de Especialidades Dr. Bernardo Sep&uacute;lveda. Centro M&eacute;dico Nacional Siglo XXI. Instituto Mexicano del Seguro Social.</i></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><i><sup>2</sup> Cl&iacute;nica de Gen&eacute;tica Psiqui&aacute;trica. Instituto Nacional de Psiquiatr&iacute;a Ram&oacute;n de la Fuente Mu&ntilde;iz.</i></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Correspondencia</b>:    <br> 	Dr. Tom&aacute;s Efr&eacute;n Holgu&iacute;n Mendoza.    <br> 	Calle Dr. Velasco 14 int. 511B,    <br> 	Doctores, Cuauht&eacute;moc, 06720. M&eacute;xico, D.F.    <br> 	Tel&eacute;fono: (55) 5588&#45;9369. Celular: (55) 4487&#45;2812.    <br> 	E&#45;mail: <a href="mailto:praximeo@me.com">praximeo@me.com</a></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2">Recibido: 27 de febrero de 2013.    ]]></body>
<body><![CDATA[<br> 	Aceptado: 30 de octubre de 2013.</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 antisocial personality disorder (ASPD) is characterized by an incapacity for an individual to adapt himself or herself to the social norms. These social norms are extremely important because they govern many aspects of behavior during adolescence and adulthood. Patients with ASPD typically have irritability problems and aggressive feelings toward other people. These aggressive feelings toward other people are expressed in a context of threat and intimidation. The ASPD is less common in clinical settings comparing the total population, in which the prevalence is 1.1. The familial aggregation for ASPD has been registered, in which the 40&#45;50% of the variance can be explained to genetic influences. Most of the studies of ASPD in molecular genetics have been applying the hypothesis of association of candidate genes, focusing on genes associated with neurotransmission pathways. This has been greatly relevant to the monoamine oxidase gene (MAO). Genes that promote specific behavior between individuals must have been selected through the process of natural selection. Aggressive behaviors and other types of behavior that have an evolutionary origin are similar in the fact that they have to be codified in the genes and will later be transmitted to their descendants.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Key words:</b> Antisocial personality disorder, cuantitative genetics, molecular genetics.</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 trastorno antisocial de la personalidad (TAP) consiste en una incapacidad para adaptarse a las normas sociales que habitualmente rigen numerosos aspectos de la conducta de las personas en la adolescencia y la edad adulta. Los pacientes con TAP caracter&iacute;sticamente tienen problemas de irritabilidad y sentimientos agresivos hacia los dem&aacute;s, los cuales se expresan en el contexto de la amenaza o la intimidaci&oacute;n. El TAP es menos com&uacute;n en la cl&iacute;nica compar&aacute;ndolo con la poblaci&oacute;n general en la que se reporta una prevalencia media del 1.1. Se ha registrado una agregaci&oacute;n familiar para el TAP en la que el 40&#45;50% de la varianza puede ser explicada por influencias gen&eacute;ticas. La mayor&iacute;a de los estudios de gen&eacute;tica molecular en el TAP se han realizado utilizando la hip&oacute;tesis basada en los estudios de asociaci&oacute;n con genes candidatos, enfoc&aacute;ndose en los genes relacionados a v&iacute;as de neurotransmisi&oacute;n, siendo uno de los m&aacute;s relevantes, hasta el momento, el gen para la monoamino oxidasa (MAOA). Aquellos genes que promueven que cierta conducta exista entre los individuos debieron haberse elegido a trav&eacute;s del proceso de la selecci&oacute;n natural. De manera similar a otros comportamientos que tienen or&iacute;genes evolutivos, los comportamientos agresivos tambi&eacute;n deben ser codificados en los genes, que a la postre ser&aacute;n transmitidos a la descendencia.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Palabras clave:</b> Trastorno antisocial de la personalidad, gen&eacute;tica cuantitativa, gen&eacute;tica molecular.</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>Definiciones</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Un trastorno de la personalidad (TP) es definido por el DSM&#45;IV&#45;TR (Diagnostic and Statistical Manual of Mental Disorders) como un patr&oacute;n r&iacute;gido de experiencia interna y de conducta que se desv&iacute;a marcadamente de las expectativas culturales del individuo, es persistente e inflexible, tiene su inicio en la adolescencia o en la adultez temprana, es estable a trav&eacute;s del tiempo y conlleva malestar o deterioro.<sup>1</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Uno de los aspectos m&aacute;s antiguos y controversiales en el campo de la clasificaci&oacute;n de los TP ha sido si &eacute;stos deber&iacute;an ser conceptualizados dimensional o categ&oacute;ricamente. Parece ser que existe un acuerdo general de que los TP se clasificar&iacute;an mejor de manera dimensional,<sup>2&#45;4</sup> y se discutieron distintos sistemas alternativos para el DSM&#45;5.<sup>5</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">S&oacute;lo los criterios del trastorno antisocial de la personalidad (TAP), de entre el resto de los trastornos de personalidad, han producido hist&oacute;ricamente niveles aceptables de confiabilidad, y esos criterios han enfatizado los actos abiertamente criminales o delictivos.</font></p>  	    <p align="justify"><font face="verdana" size="2">El TAP consiste en una incapacidad para adaptarse a las normas sociales que habitualmente rigen numerosos aspectos de la conducta de las personas en la adolescencia y la edad adulta. Los pacientes con TAP caracter&iacute;sticamente muestran f&aacute;cilmente irritabilidad y sentimientos agresivos hacia los dem&aacute;s, los cuales se expresan en el contexto de la amenaza o la intimidaci&oacute;n.</font></p>  	    <p align="justify"><font face="verdana" size="2">El DSM&#45;IV&#45;TR lo describe como un trastorno caracterizado por un patr&oacute;n general de desprecio y violaci&oacute;n de los derechos de los dem&aacute;s que se presenta desde la edad de 15 a&ntilde;os.</font></p>  	    <p align="justify"><font face="verdana" size="2">La investigaci&oacute;n longitudinal ha documentado que los ni&ntilde;os y los adolescentes con trastornos de la conducta tienen un mayor riesgo para presentar conductas antisociales en la adultez.<sup>6</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Aunque no todas las conductas antisociales de la adultez tienen antecedentes en la infancia,<sup>7</sup> los trastornos con factores gen&eacute;ticos contribuidores tienden a manifestarse de forma temprana en la vida. Hasta la mitad de aquellos que presentan un trastorno de conducta de manera temprana pueden a&uacute;n experimentarlo en la adultez, mientras que los individuos con inicio m&aacute;s tard&iacute;o de los s&iacute;ntomas pueden experimentar s&iacute;ntomas transitorios y lograr la remisi&oacute;n.<sup>8&#45;11</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Epidemiolog&iacute;a</b></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En 12 estudios de poblaci&oacute;n general que analizaron la prevalencia de distintos trastornos de personalidad, reportaron prevalencias para el TAP que iban del 0.2 al 4.5, con una media de 1.1. El primer estudio reportado es de 1989 y el &uacute;ltimo, del 2007. Fueron realizados en los EUA, el Reino Unido y Noruega, con entrevistas estructuradas del DSM&#45;III, DSM&#45;III&#45;R y DSM&#45;IV como instrumentos de medici&oacute;n seg&uacute;n cada &eacute;poca.<sup>12</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El TAP es menos com&uacute;n en la cl&iacute;nica compar&aacute;ndolo con la poblaci&oacute;n general. Esto se debe a que los pacientes con patrones de pensamiento y conducta antisocial rara vez buscan tratamiento.<sup>13</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Se presenta con mayor frecuencia en hombres que en mujeres.<sup>14&#45;16</sup> Dentro del <i>cluster</i> B de los trastornos de personalidad del DSM&#45;IV&#45;TR, las personas con rasgos o franco TAP suelen ser mas j&oacute;venes,<sup>17</sup> con mayor frecuencia est&aacute;n divorciadas, separadas o nunca se han casado; cuando son entrevistadas frecuentemente est&aacute;n solteras y viven solas.</font></p>  	    <p align="justify"><font face="verdana" size="2">Algunos estudios documentan que el TAP &#45;o personas con estos rasgos&#45;, se encuentra relacionado con una baja educaci&oacute;n. Un estudio del 2006 encontr&oacute; que todos los trastornos del <i>cluster</i> B estaban asociados a una clase social baja;<sup>18</sup> y en un estudio del 2004 se document&oacute; una asociaci&oacute;n con ingresos menores;<sup>19</sup> pero un estudio del 2002 no hab&iacute;a encontrado ninguna asociaci&oacute;n con el ingreso.<sup>20</sup></font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Datos en M&eacute;xico</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En las estad&iacute;sticas sobre menores infractores se puede observar un incremento en el n&uacute;mero de los sujetos puestos a disposici&oacute;n del Consejo de Menores, es decir, de aquellos y Palacios Casados</font></p>  	    <p align="justify"><font face="verdana" size="2">sometidos a alg&uacute;n proceso penal; de 2 623 registrados en el a&ntilde;o 1999, la cifra se elev&oacute; a 3 506 en el 2003.<sup>19,21</sup> Se ha observado que es mayor la proporci&oacute;n de hombres que cometen infracciones y, adem&aacute;s, que los adolescentes son puestos a disposici&oacute;n del Consejo de Menores a una edad m&aacute;s temprana. Los robos constituyen la principal infracci&oacute;n, pero en a&ntilde;os m&aacute;s recientes se documentan infracciones que, aunque cometidas por una escasa proporci&oacute;n de adolescentes, se pueden considerar de mayor gravedad, por ejemplo el homicidio, la portaci&oacute;n de armas prohibidas, la violaci&oacute;n y el abuso sexual.<sup>22</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Al revisar la conducta antisocial en los estudiantes adolescentes de M&eacute;xico, los resultados m&aacute;s importantes indican tambi&eacute;n que es mayor la proporci&oacute;n de los hombres que incurren en este tipo de comportamientos, y que destacan la participaci&oacute;n en ri&ntilde;as, el golpear o da&ntilde;ar cosas ajenas, el golpear o herir a otras personas y tomar dinero ajeno. Los comportamientos considerados de mayor gravedad como vender drogas y usar un arma para robar o atacar a alguien, se han documentado en una proporci&oacute;n baja de estudiantes.<sup>23&#45;26</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En mediciones que se realizaron en 1997, 2000 y 2003, en estudiantes adolescentes del nivel escolar medio y medio superior de escuelas p&uacute;blicas y privadas del Distrito Federal, en un estudio que buscaba las tendencias de la conducta antisocial, se encontr&oacute; que de 1997 al 2000 hubo un incremento del 1.9% de cualquiera de las conductas antisociales, y del 2000 al 2003 el aumento fue de 6.7%. En t&eacute;rminos generales, el estudio concluye que hubo un incremento para conductas antisociales no graves relacionadas con violencia y robo, como lo ser&iacute;an tomar parte en ri&ntilde;as, golpear o da&ntilde;ar objetos, golpear o herir a personas, tomar mercanc&iacute;a sin pagarla y robar dinero o valores por 50 pesos o menos; as&iacute; como de conductas antisociales graves, espec&iacute;ficamente la sustracci&oacute;n de dinero o valores mayores a 500 pesos y atacar a alguien usando un objeto o arma, aunque esta &uacute;ltima conducta con incrementos menores.<sup>27</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Estas situaciones se presentaron de manera similar en los hombres y en las mujeres, aunque &eacute;stas a&uacute;n representan una proporci&oacute;n menor, con una relaci&oacute;n de casi dos hombres por cada mujer.</font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">En el presente texto nos enfocaremos en los factores gen&eacute;ticos del TAP, haciendo referencia a la interacci&oacute;n que parece darse entre genes y ambiente para que se desarrolle el trastorno o alg&uacute;n rasgo, a la vez que se considerar&aacute; una perspectiva evolutiva de estas conductas.</font></p>  	    <p align="justify"><font face="verdana" size="2">&nbsp;</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Aspectos Gen&eacute;ticos</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La gen&eacute;tica psiqui&aacute;trica es un campo multidisciplinario con ra&iacute;ces en la gen&eacute;tica humana, la psiquiatr&iacute;a, las estad&iacute;sticas y la epidemiolog&iacute;a, que data de poco m&aacute;s de 100 a&ntilde;os. El trabajo m&aacute;s temprano en este campo involucr&oacute; m&eacute;todos de gen&eacute;tica cl&iacute;nica y conductual (o gen&eacute;tica cuantitativa), como estudios de familia, de gemelos y de adopci&oacute;n, los cuales son efectivos para establecer si los factores gen&eacute;ticos influyen en un rasgo y en qu&eacute; grado. Subsecuentemente, el campo se diversific&oacute; para incluir m&eacute;todos de gen&eacute;tica molecular como los an&aacute;lisis de ligamiento y de asociaci&oacute;n, que se supon&iacute;a permitir&iacute;an el aislamiento de regiones de cromosomas <i>(locus</i> candidatos) y la identificaci&oacute;n de genes espec&iacute;ficos que estuvieran mediando la transmisi&oacute;n familiar de un rasgo conductual.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Gen&eacute;tica cuantitativa</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Los rasgos normales de personalidad han mostrado repetidamente estar influidos por factores gen&eacute;ticos, con estimaciones que van de un 30% a un 60% de heredabilidad aproximadamente.<sup>28,29</sup> Estimaciones similares de heredabilidad han sido encontradas en clasificaciones dimensionales de los TP basadas en autorregistros.<sup>30</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Los estudios de epidemiolog&iacute;a gen&eacute;tica indican que los 10 trastornos de personalidad clasificados en el eje II del DSM&#45;IV&#45;TR son de leve a moderadamente heredables.</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>Estudios de familia</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Se ha registrado agregaci&oacute;n familiar para el TAP.<sup>31</sup> Existe un patr&oacute;n familiar que se manifiesta en una frecuencia cinco veces mayor entre los familiares de primer grado de los varones afectados que entre los familiares de los individuos de control.<sup>32</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El TAP parece tener tanto ra&iacute;ces gen&eacute;ticas como ambientales. Un adulto adoptado que tiene un padre biol&oacute;gico con registros de haber estado en prisi&oacute;n por haber mostrado conductas antisociales tiene cuatro veces m&aacute;s probabilidades de presentar una problem&aacute;tica conducta agresiva que una persona sin tal vulnerabilidad biol&oacute;gica. Al mismo tiempo, una persona en la que su padre adoptivo tiene un TAP, tiene m&aacute;s de tres veces la probabilidad para desarrollar el trastorno (comparado con la poblaci&oacute;n general sin este antecedente), a pesar de la historia biol&oacute;gica.<sup>33</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Estudios de gemelos y adopci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">En un estudio de poblaci&oacute;n con gemelos utilizando representaciones dimensionales para los TP del <i>cluster</i> B del DSM&#45;IV, se encontr&oacute; una heredabilidad para el TAP del 38%.<sup>34</sup> Los factores gen&eacute;ticos aditivos dan raz&oacute;n del 49% de la varianza y son m&aacute;s importantes que el ambiente compartido para la psicopatolog&iacute;a.<sup>35</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En su texto <i>Psychiatric Genetics: A Primer (2008),</i> Tsuang estima que la heredabilidad (h2) para el TAP es del 69%, equivalente al trastorno l&iacute;mite de la personalidad, encontr&aacute;ndose por debajo del tartamudeo y por encima del trastorno obsesivo compulsivo.<sup>36</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Una revisi&oacute;n meta&#45;anal&iacute;tica del TAP, de 1997, sugiere que el 40&#45;50% de la varianza puede ser explicada por influencias gen&eacute;ticas.<sup>37</sup> A su vez, en un meta&#45;an&aacute;lisis realizado por Rhee et al. en 2002, con 51 estudios de gemelos y de adopci&oacute;n de conductas antisociales basado en registros, autorreportes y reportes familiares, se encontr&oacute; que la varianza podr&iacute;a ser explicada por factores gen&eacute;ticos aditivos (32%), factores gen&eacute;ticos no aditivos (9%), factores por ambiente compartido (16%) y factores de ambiente individual espec&iacute;fico (43%),<sup>35</sup> sin existir diferencias significativas en la magnitud de las influencias gen&eacute;ticas y ambientales para hombres y mujeres. En un meta&#45;an&aacute;lisis m&aacute;s reciente, Ferguson encontr&oacute; en el 2010 que las influencias gen&eacute;ticas representaron el componente m&aacute;s importante en la varianza del TAP, con un 56%; los factores por ambiente compartido con un 11% y los factores de ambiente individual especifico con un 31%. Al mismo tiempo se encontr&oacute; que las influencias gen&eacute;ticas ten&iacute;an un mayor poder predictivo para el TAP en los individuos j&oacute;venes que en los adultos. Estos resultados indican que el componente gen&eacute;tico es un contribuyente importante para el TAP pero que las influencias no gen&eacute;ticas, particularmente las experiencias de vida &uacute;nicas, tambi&eacute;n son importantes.<sup>38</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Sea como sea, de acuerdo a la informaci&oacute;n que se tiene para el TAP y otros trastornos de la personalidad, es importante recordar que todas las estimaciones de heredabilidad son dependientes de la muestra.</font></p>  	    <p align="justify"><font face="verdana" size="2">Un estudio de Torgersen et al. (2008) en una poblaci&oacute;n de gemelos, que inclu&iacute;a todos los TP del <i>cluster</i> B, indic&oacute; que el TAP parec&iacute;a contener muchos m&aacute;s factores de riesgo gen&eacute;tico que aquellos contenidos en com&uacute;n con otros TP del <i>cluster</i> B, a excepci&oacute;n del trastorno l&iacute;mite de la personalidad.</font></p>  	    <p align="justify"><font face="verdana" size="2">Numerosos estudios de familia, de gemelos y de adopci&oacute;n han demostrado que el TAP, los trastornos de la conducta y los trastornos por consumo de sustancias (frecuentemente denominados trastornos externalizados), conllevan un riesgo gen&eacute;tico com&uacute;n.<sup>39,40</sup> En un estudio de familias con gemelos realizado por Hicks et al. (2004), se encontr&oacute; una alta vulnerabilidad general heredable (80%) para todos los trastornos externalizados, que represent&oacute; a la mayor&iacute;a de los parentescos familiares.<sup>41</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En un estudio de gemelos realizado por Lyons et al. (1995), se demostr&oacute; que la influencia gen&eacute;tica en los s&iacute;ntomas del TAP del DSM&#45;III&#45;R era m&aacute;s prominente en los adultos que en los adolescentes.<sup>42</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Todos estos resultados sugieren que las influencias gen&eacute;ticas tienen una contribuci&oacute;n significativa para el TAP.</font></p>  	    <p align="justify"><font face="verdana" size="2">En 1974, Crowe<sup>43</sup> encontr&oacute; que el cuidado institucional temprano era un factor de riesgo para la posterior conducta antisocial s&oacute;lo cuando se encontraba presente un factor de riesgo gen&eacute;tico. En otro estudio de adopci&oacute;n, Cadoret et al. (1983)<sup>44</sup> encontraron una significativa interacci&oacute;n gen&#45;ambiente cuando mostraron que exist&iacute;a un riesgo despreciable para la conducta antisocial si s&oacute;lo se ten&iacute;a el factor de riesgo gen&eacute;tico (conducta antisocial en el padre biol&oacute;gico) y un nulo efecto si s&oacute;lo exist&iacute;a un ambiente adverso en la familia adoptiva, pero que exist&iacute;a un efecto sustancial cuando ambos factores de riesgo estaban presentes. Este hallazgo fue replicado despu&eacute;s en un estudio con un mayor n&uacute;mero de adoptados.<sup>45</sup> Jaffe et al. (2005),<sup>46</sup> utilizando un dise&ntilde;o de gemelos, encontraron una interacci&oacute;n significativa gen&#45;ambiente con respecto al maltrato infantil y el desarrollo de la conducta antisocial, y en un estudio de gemelos Tuvblad et al. (2006)<sup>47</sup> demostraron una significativa interacci&oacute;n genambiente al demostrar que la heredabilidad para la conducta antisocial en adolescentes es mayor en entornos socioecon&oacute;micos desfavorecidos. Al utilizar un avanzado estudio de familia, Feinberg et al. (2007)<sup>48</sup> encontraron una interacci&oacute;n del genotipo con la negligencia parental, as&iacute; como con el escaso afecto, prediciendo la conducta antisocial. En un estudio de poblaci&oacute;n con gemelos, Hicks et al. (2009) demostraron una significativa interacci&oacute;n gen&#45;ambiente con distintos factores de riesgo ambientales, mostrando que una mayor adversidad ambiental se asociaba con un riesgo gen&eacute;tico incrementado para el TAP y el trastornos por consumo de sustancias.<sup>49</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2"><b>Gen&eacute;tica molecular</b></font></p>  	    <p align="justify"><font face="verdana" size="2">La mayor&iacute;a de los estudios de gen&eacute;tica molecular en el TP se han realizado utilizando la hip&oacute;tesis basada en los estudios de asociaci&oacute;n con genes candidatos, enfoc&aacute;ndose en los genes relacionados a v&iacute;as de neurotransmisi&oacute;n, especialmente en los sistemas serotonin&eacute;rgico y dopamin&eacute;rgico. Ejemplos de genes relacionados al metabolismo incluyen a la cateco&#45;O&#45;metil transferasa (COMT), la monoamino oxidasa (MAOA) y la dopamina beta&#45;hidroxilasa (DBH); aquellos relacionados a la morfolog&iacute;a del receptor incluyen al receptor D2 de dopamina (DRD2), al receptor D4 de dopamina (DRD4), al receptor 1B de serotonina (5HTR1B) y al receptor 2A de serotonina (5HTR2A); y aquellos relacionados a la actividad de transportadores incluyen al transportador de serotonina (en particular un polimorfismo en la regi&oacute;n promotora del gen referido como "transportador de serotonina ligado a las regiones polim&oacute;rficas" o 5HTTLPR) y el transportador de dopamina (DAT).</font></p>  	    <p align="justify"><font face="verdana" size="2"><b>An&aacute;lisis de ligamiento y de asociaci&oacute;n</b></font></p>  	    <p align="justify"><font face="verdana" size="2">M&uacute;ltiples l&iacute;neas de evidencia sugieren que una disfunci&oacute;n en el sistema de la serotonina (5&#45;HT) est&aacute; asociada con la impulsividad, la agresi&oacute;n, la labilidad afectiva y el suicidio. Los genes ligados a la funci&oacute;n de estos neurotransmisores pueden ser considerados, por lo tanto, genes candidatos para el TAP.</font></p>  	    <p align="justify"><font face="verdana" size="2">Localizado en el cromosoma 17 (17q11.2), el transportador de serotonina (5HTT o SLC6A4) codifica una prote&iacute;na transportadora que remueve la serotonina del espacio sin&aacute;ptico y la introduce a las neuronas presin&aacute;pticas. Este sitio es un blanco de acci&oacute;n de los medicamentos antidepresivos. Un repetido en t&aacute;ndem de n&uacute;mero variable (del ingl&eacute;s VNTR <i>&#45;variable number tandem repeat)</i> en el promotor de este gen (5HTTLPR) ha mostrado que afecta la proporci&oacute;n de recaptura de serotonina y puede desempe&ntilde;ar un papel en la conducta enferma, con los alelos cortos en este polimorfismo esencialmente dial&eacute;lico (ya sea corto o largo) siendo relacionados con niveles bajos de transcripci&oacute;n de este gen.<sup>44</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Cadoret et al. (2003) encontraron una relaci&oacute;n entre la baja actividad de la variante corta del 5HTTLPR y el espectro de los trastornos externalizados ante la presencia de adversidad ambiental despu&eacute;s del control de otras variables, tales como el sexo y la edad.<sup>50</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Un estudio de Lyons&#45;Ruth et al. (2007) encontr&oacute; una relaci&oacute;n significativa entre el alelo corto de 5HTTLPR y el TA,<sup>51</sup> pero otros estudios han fallado en encontrar una asociaci&oacute;n entre ese polimorfismo y alg&uacute;n trastorno de personalidad del <i>cluster</i> B.<sup>52</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En un estudio de Retz et al. (2004) se encontr&oacute; una relaci&oacute;n entre el gen promotor del transportador de serotonina (5&#45;HTT) y la violencia impulsiva en una muestra forense de 153 hombres. Espec&iacute;ficamente, un polimorfismo tipo deleci&oacute;n/ inserci&oacute;n en este gen predijo la conducta violenta impulsiva en esta poblaci&oacute;n.<sup>53</sup> Otros investigadores tambi&eacute;n han examinado el fenotipo antisocial&#45;conducta disocial encontrando correlaciones con la forma de baja actividad del 5HTTLPR en mujeres con bulimia,<sup>54</sup> y en hombres y mujeres en una variedad de escenarios,<sup>55&#45;58</sup> pero Monuteaux et al. (2009) no encontraron asociaci&oacute;n entre el 5HTTLPR y los trastornos de conducta en una muestra de individuos con TDAH.<sup>59</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Una vez m&aacute;s, Retz et al. (2008) confirmaron que los portadores de dos alelos largos ten&iacute;an m&aacute;s s&iacute;ntomas de TDAH en la infancia y la adultez, pero que los sujetos con al menos un alelo corto estaban m&aacute;s sensibilizados para la adversidad en la infancia que aquellos que portaban los dos alelos largos.<sup>60</sup> Posteriormente, Retz y Rosler (2009) presentaron una interesante revisi&oacute;n selectiva de TDAH, agresi&oacute;n y 5HTTLPR, notando que la literatura cient&iacute;fica en general sosten&iacute;a la idea de que polimorfismos comunes podr&iacute;an producir efectos diferentes ante circunstancias diferentes; concluyeron que aquellos individuos portadores de dos alelos largos estaban en mayor riesgo para TDAH, pero aquellos con alelos cortos presentaban mayor riesgo para el TDAH y la conducta violenta ante un escenario de estr&eacute;s ambiental.<sup>61</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Recientes estudios han implicado el gen para el receptor de serotonina 5HTR2A con impulsividad, agresi&oacute;n y conducta antisocial.<sup>62&#45;64</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Un estudio de Dick et al. (2006) encontr&oacute; que los individuos que ten&iacute;an un polimorfismo en el gen GRBRA2 asociado con dependencia al alcohol era menos probable que estuvieran casados, en parte porque ten&iacute;an un riesgo m&aacute;s elevado para el TAP y estaban menos motivados por el deseo de complacer a los dem&aacute;s.<sup>65</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Los polimorfismos en el gen MAOA se han asociado con trastornos de personalidad del <i>cluster</i> B<sup>66</sup> y con rasgos antisociales.<sup>67</sup> El gen MAOA est&aacute; localizado en el cromosoma X (Xp11.4&#45;p11.3) y codifica para la monoamino oxidasa A, una enzima que degrada los neurotransmisores am&iacute;nicos, como la dopamina, la noradrenalina y la serotonina. La mutaci&oacute;n en este gen da como resultado una deficiencia de monoamino oxidasa, o el s&iacute;ndrome de Brunner, el cual se caracteriza, en parte, por una grave conducta impulsiva.<sup>44</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Basado en los resultados de los estudios cuantitativos de gen&eacute;tica que mostraban una interacci&oacute;n gen&#45;ambiente en la conducta antisocial, Caspi et al (2002)<sup>68</sup> estudiaron la asociaci&oacute;n entre el maltrato infantil y un polimorfismo funcional en la regi&oacute;n promotora del gen MAOA sobre la conducta antisocial, evaluada por medio de un rango de medidas categ&oacute;ricas y dimensionales utilizando cuestionarios, entrevistas y registros oficiales. Los resultados no mostraron un efecto importante exclusivo del gen, s&oacute;lo un ligero efecto para el maltrato, pero s&iacute; una sustancial y significativa interacci&oacute;n entre el gen y la adversidad. Los ni&ntilde;os maltratados que eran portadores para niveles bajos de expresi&oacute;n del gen MAOA, con mayor frecuencia desarrollaron trastornos de conducta y una personalidad antisocial que aquellos ni&ntilde;os con un genotipo de alta actividad para MAOA. Foley et al. (2004)<sup>69</sup> repitieron estos hallazgos y extendieron el an&aacute;lisis inicial al mostrar que la interacci&oacute;n gen&#45;ambiente no pod&iacute;a explicarse por una correlaci&oacute;n gen&#45;ambiente; otros estudios han replicado a la vez estos hallazgos del genotipo de baja actividad del MAOA.<sup>70&#45;81</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Otros estudios sugieren que los efectos de los genes no son contribuyentes para la predicci&oacute;n de la conducta disruptiva en aquellos con una historia de maltrato u otros estresores durante el periodo de desarrollo.<sup>82,83</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Weder et al. (2009) encontraron que la vulnerabilidad era inducida por la MAOA en niveles moderados de trauma ambiental, pero que el genotipo no era contribuyente a la predicci&oacute;n de agresi&oacute;n en niveles extremos de trauma ambiental. <sup>84</sup> Sjoberg et al. (2008) sugieren que el genotipo MAOA podr&iacute;a interactuar con la testosterona en la predicci&oacute;n del espectro conductual antisocial, aunque no encontraron una asociaci&oacute;n directa entre la baja actividad de la variante y la conducta agresiva,<sup>85</sup> mientras que Beaver et al. (2010) no encontraron efectos directos del genotipo MAOA con las escalas de delincuencia en una muestra de adolescentes; en cambio s&iacute; reportaron que el genotipo MAOA parec&iacute;a interactuar con d&eacute;ficits neuropsicol&oacute;gicos en la predicci&oacute;n de delincuencia.<sup>86</sup> Buckholtz y Meyer&#45;Lindenberg (2008) revisaron la bibliograf&iacute;a disponible sobre la MAOA en la agresi&oacute;n impulsiva, y propusieron un mecanismo por el cual la variante de baja actividad de la MAOA podr&iacute;a sensibilizar circuitos neuronales pertinentes al estr&eacute;s en la vida temprana, mientras conclu&iacute;an que la variaci&oacute;n de la MAOA VNTR daba raz&oacute;n para s&oacute;lo una cantidad peque&ntilde;a de la varianza en el riesgo.<sup>87</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En un meta&#45;an&aacute;lisis de Kim&#45;Cohen et al. (2006), el hallazgo original de Caspi fue replicado. Adem&aacute;s, los hallazgos se extendieron para incluir ni&ntilde;os (pr&oacute;ximos a la fecha del maltrato), y la posibilidad de un hallazgo espurio fue descartado al tomar en cuenta la correlaci&oacute;n gen&#45;ambiente.<sup>88</sup> No todos los estudios han replicado los hallazgos discutidos anteriormente.<sup>89&#45;91</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En relaci&oacute;n a la COMT, distintos estudios han implicado al polimorfismo valina/metionina (val/met) en la agresi&oacute;n entre individuos con esquizofrenia,<sup>92,93</sup> y estudios m&aacute;s recientes sugieren que sujetos homocigotos para el alelo val/met tuvieron mayor agresividad.<sup>94&#45;97</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">En un estudio de 240 ni&ntilde;os con trastorno por d&eacute;ficit de atenci&oacute;n con hiperactividad (TDAH), aquellos con la variante valina/metionina en el gen de la catecol O&#45;metil&#45;transferasa (COMT) mostraron m&aacute;s conductas antisociales que aquellos sin la variante.<sup>98</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Wagner et al. (2010) reportaron que mujeres con el polimorfismo val/val, una historia de abuso sexual en la infancia y actual trastorno l&iacute;mite de la personalidad, exhib&iacute;an menos agresi&oacute;n impulsiva que aquellas que portaban los polimorfismos val/met o met/met.<sup>99</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Es importante destacar que estos genes no parecen, por s&iacute; mismos, causar deterministamente el TAP en el mismo sentido que lo har&iacute;a el gen mutante de HD, que invariablemente produce la enfermedad de Huntington. M&aacute;s bien estos genes probablemente interact&uacute;en unos con otros de manera que a&uacute;n resulta poco entendible. Adem&aacute;s, probablemente existen muchos otros genes que est&aacute;n involucrados ya sea directa o indirectamente (p.ej., v&iacute;a interacciones) y que a&uacute;n no han sido identificados. Pero finalmente estos estudios demuestran que la vulnerabilidad gen&eacute;tica y la exposici&oacute;n a la violencia familiar interact&uacute;an entre s&iacute; para producir el TAP.</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>Una perspectiva evolutiva</b></font></p>  	    <p align="justify"><font face="verdana" size="2">Aquellos genes que promueven que cierta conducta exista entre los individuos debieron haberse elegido por medio del proceso de selecci&oacute;n natural. De manera similar a otros comportamientos que tienen or&iacute;genes evolutivos, los comportamientos agresivos tambi&eacute;n deben ser codificados en los genes, que a la postre ser&aacute;n transmitidos a la descendencia a trav&eacute;s de la reproducci&oacute;n sexual.<sup>41</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">El TAP puede ser entendido como un bi&#45;producto de la agresi&oacute;n humana normal. Espec&iacute;ficamente, la agresividad puede ser definida como la producci&oacute;n de una conducta intencional para causar da&ntilde;o f&iacute;sico o humillaci&oacute;n a otra persona que desea evitar dicho da&ntilde;o. Pero la conducta violenta antisocial, adem&aacute;s de ser todo lo anterior, se lleva a cabo sin tener cuidado por el bienestar o los derechos de los dem&aacute;s. Por ejemplo, actuar en autodefensa como respuesta a un individuo amenazante podr&iacute;a considerarse como una conducta agresiva, pero no una conducta antisocial.<sup>41,100</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Teniendo en consideraci&oacute;n la existencia de aparentes subtipos cualitativos de agresi&oacute;n, se puede desarrollar un constructo sensible que hipotetice una dicotom&iacute;a entre un subtipo impulsivo&#45;reactivo&#45;hostil&#45;afectivo (agresi&oacute;n defensiva) y un subtipo controlado&#45;proactivo&#45;instrumental&#45;depredador (agresi&oacute;n ofensiva).<sup>101</sup> Aunque la mayor&iacute;a de los estudios neurobiol&oacute;gicos de la agresi&oacute;n y la violencia desafortunadamente no diferencian entre agresi&oacute;n defensiva y ofensiva, esta distinci&oacute;n puede ser relevante para entender los fundamentos neurobiol&oacute;gicos de la conducta agresiva, m&aacute;s a&uacute;n si est&aacute;n influidos por circuitos neuronales anat&oacute;mica y funcionalmente distintos.<sup>102</sup> Se cree que la propensi&oacute;n para la agresi&oacute;n impulsiva, que es relativamente no planeada y espontanea, pero que culmina en la violencia f&iacute;sica, se encuentra asociada con un umbral bajo a la activaci&oacute;n de los afectos negativos y con una falla para responder apropiadamente ante las potenciales consecuencias perjudiciales previstas por ese comportamiento. La investigaci&oacute;n sociopsicol&oacute;gica subraya la relaci&oacute;n entre cognici&oacute;n, emoci&oacute;n y agresi&oacute;n; afectos negativos tales como el miedo y la ansiedad frecuentemente precipitan, acent&uacute;an y modulan la conducta agresiva. As&iacute;, parece razonable que los circuitos neuronales que afectan los estados emocionales, como el sistema serotonin&eacute;rgico central, tambi&eacute;n afectar&iacute;an la predisposici&oacute;n para las conductas agresivas.<sup>103</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">La agresi&oacute;n puede ser considerada como una respuesta adaptativa que puede proporcionar ciertos beneficios, tales como la cooptaci&oacute;n o la defensa de recursos, mayores opciones de apareamiento y fidelidad de la pareja, as&iacute; como un mayor estatus.</font></p>  	    <p align="justify"><font face="verdana" size="2">Nuestro entendimiento de las conductas antisociales puede edificarse sobre distintos supuestos que se derivan de los modelos de la psicolog&iacute;a evolucionista, los cuales ser&iacute;an: 1) La agresi&oacute;n humana es una respuesta normativa y adaptativa que le provee una ventaja selectiva a los individuos (hay que notar que esto no implica que sea moralmente deseable); 2) La limitaci&oacute;n de la agresi&oacute;n (p. ej., control del impulso) tambi&eacute;n es una respuesta normativa y adaptativa que provee una ventaja selectiva a los individuos; 3) Los instintos de agresi&oacute;n y de control del impulso agresivo responden a est&iacute;mulos ambientales, o catalizadores, los cuales son procesados cognitivamente con el objeto de seleccionar la respuesta m&aacute;s adaptativa a un determinado estresor ambiental. 4) El cerebro humano ha desarrollado sistemas o "dispositivos" independientes para manejar por separado las unidades encargadas de la agresividad y del control&#45;reducci&oacute;n del impulso agresivo. Estos dispositivos pueden llegar a competir entre s&iacute; en algunas ocasiones, particularmente cuando los catalizadores ambientales son ambiguos.<sup>104</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Desde una perspectiva evolutiva, una conducta tan ubicua como la agresi&oacute;n puede ser mejor entendida como una adaptaci&oacute;n a las presiones del medio ambiente y que provee una ventaja selectiva a los miembros de la especie.<sup>105</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Aunque la agresi&oacute;n en moderadas cantidades y en proporci&oacute;n a las amenazas del ambiente puede ser ben&eacute;fica, los altos niveles de agresi&oacute;n pueden claramente ser "demasiado de algo bueno" fenot&iacute;picamente hablando. Los altos niveles de agresi&oacute;n pueden situar a un individuo en el riesgo extremo de da&ntilde;ar, o pueden conducirle al rechazo social y privarlo de los beneficios de los grupos sociales, mismos que tambi&eacute;n contribuyeron a la sobrevivencia de los organismos hom&iacute;nidos individuales. Por lo tanto, no es que un individuo se beneficiar&aacute; de ser agresivo, sino m&aacute;s bien de saber cu&aacute;ndo serlo y de cu&aacute;ndo controlar tales impulsos. As&iacute; como un instinto agresivo puede proveer una ventaja selectiva ante determinadas circunstancias, tambi&eacute;n un instinto de reducci&oacute;n de la agresividad puede proveer una ventaja selectiva en otras circunstancias.<sup>52</sup> El instinto de reducci&oacute;n de la agresividad puede ser sin&oacute;nimo de lo que frecuentemente se refiere como "control del impulso" o "funciones ejecutivas". Los d&eacute;ficits en porciones del cerebro (p. ej., la corteza de los l&oacute;bulos frontales) relacionados con las funciones ejecutivas han demostrado que predicen comportamientos excesivamente agresivos (p. ej., conductas antisociales).<sup>106&#45;108</sup> Los estudios de neuroimagen documentan que lesiones de la corteza frontal se asocian con agresividad impulsiva, o por lo menos con rasgos agresivos.<sup>109</sup> Los individuos con TAP tienen 11% menos materia gris en la corteza prefrontal en comparaci&oacute;n con los individuos sin este trastorno. Este fue el caso incluso para individuos sin historia de lesi&oacute;n cerebral. Un estudio encontr&oacute; resultados similares en individuos violentos, en comparaci&oacute;n a los controles no violentos, en la corteza prefrontal, la am&iacute;gdala y el hipocampo.<sup>110</sup> Los estudios sobre la corteza prefrontal y la violencia son numerosos, y existen excelentes revisiones sobre el tema.<sup>111,112</sup></font></p>  	    <p align="justify"><font face="verdana" size="2">Es importante enfatizar la interacci&oacute;n gen&#45;ambiente, ya que de existir un genotipo antisocial, como cualquier otro genotipo, es poco probable que produzca un patr&oacute;n conductual est&aacute;tico en todas las situaciones ambientales. M&aacute;s bien el genotipo produce un rango de conductas con el objeto de permitirle al individuo ajustarse a las diferentes amenazas ambientales. Ambientes con pocas amenazas o tensi&oacute;n son menos probables que produzcan respuestas conductuales antisociales, al contrario de lo que har&iacute;an ambientes con altas amenazas o tensi&oacute;n. Comprender cu&aacute;les situaciones ambientales son m&aacute;s probables que produzcan conductas antisociales en individuos con un genotipo de alto riesgo para la personalidad antisocial podr&iacute;a proveer m&eacute;todos prometedores para la prevenci&oacute;n y la intervenci&oacute;n dirigidas a incrementar el rango conductual de los individuos antisociales provey&eacute;ndoles de opciones conductuales no agresivas. Desde una perspectiva evolutiva, la forma en la cual interact&uacute;an los genes y el ambiente har&aacute; al individuo m&aacute;s flexible para hacer frente a una serie de posibles amenazas ambientales. Un organismo conductualmente flexible es inherentemente m&aacute;s adaptativo que uno conductualmente r&iacute;gido.<sup>41</sup></font></p>  	    ]]></body>
<body><![CDATA[<p align="justify"><font face="verdana" size="2">Como se ha indicado a lo largo del presente texto, la presencia de un significativo componente gen&eacute;tico en el TAP sugiere el origen evolutivo de estas conductas. Entender las influencias gen&eacute;ticas de la conducta e identificar los factores gen&eacute;ticos de riesgo en los individuos, puede resultar en tratamientos que te&oacute;ricamente podr&iacute;an estar dirigidos temprana y preventivamente hacia aquellos individuos que tengan semejantes factores. Comprensiblemente, la discusi&oacute;n de esas posibilidades incluye considerables preocupaciones &eacute;ticas.<sup>113</sup> Esto no presupone que tales t&eacute;cnicas no puedan probar en el futuro su utilidad, sino que deben tomarse con gran cuidado para asegurar que cualquier intervenci&oacute;n conductual o m&eacute;dica dirigida a prevenir la violencia se realice s&oacute;lo bajo estrictas gu&iacute;as y par&aacute;metros &eacute;ticos.<sup>41</sup></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. Trastornos de la personalidad. En: L&oacute;pez J, Vald&eacute;s M (eds). DSM&#45;IV&#45;TR. Breviario. Criterios Diagn&oacute;sticos. 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