<?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>1817-5996</journal-id>
<journal-title><![CDATA[Revista Cubana de Reumatología]]></journal-title>
<abbrev-journal-title><![CDATA[Rev Cuba Reumatol]]></abbrev-journal-title>
<issn>1817-5996</issn>
<publisher>
<publisher-name><![CDATA[Editorial CIMEQ]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1817-59962015000400008</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Epigenética y enfermedades autoinmunes sistémicas]]></article-title>
<article-title xml:lang="en"><![CDATA[Epigenetics and autoimmune systemic diseases]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Torres Lima]]></surname>
<given-names><![CDATA[Ana María]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rodríguez Torres]]></surname>
<given-names><![CDATA[Ana Yolanda]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Ciencias Médicas de la Habana Facultad de Ciencias Médicas 10 de Octubre Hospital Docente Clínico Quirúrgico 10 de Octubre]]></institution>
<addr-line><![CDATA[La Habana ]]></addr-line>
<country>Cuba</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Ciencias Médicas de la Habana Instituto de Ciencias Básicas y Preclínicas Victoria de Girón ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2015</year>
</pub-date>
<volume>17</volume>
<numero>3</numero>
<fpage>216</fpage>
<lpage>222</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_arttext&amp;pid=S1817-59962015000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_abstract&amp;pid=S1817-59962015000400008&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://scielo.sld.cu/scielo.php?script=sci_pdf&amp;pid=S1817-59962015000400008&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La epigenética, como ciencia que estudia la modificaciones heredables en la función del genoma que se realizan sin cambios en la secuencia del ADN, está atrayendo una atención creciente entre la comunidad científica, por su contribución en la patogenia de un grupo numeroso de enfermedades, en sus enfoques terapéuticos e incluso en la prevención de las mismas. Las enfermedades autoinmunes sistémicas tienen una etipatogenia multifactorial compleja y en los últimos años las evidencias tanto clínicas, como experimentales, de la influencia que ejercen los cambios en el epigenoma, en estas entidades clínicas, son numerosas y pretendemos abordarlas en esta serie de artículos de revisión.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Epigenetics as the science about inheritables modifications of genetic information without DNA sequence changes, is atracting an increasing focus among scientific community, for his contribution in pathogenesis, therapeutic approaches and even in prevention of many diseases. Systemic autoimmune diseases have a multifactorial complex pathogenesis and in the last few years there are numerous clinical and experimental evidences, about the influence of epigenoma changes in these diseases, so we pretend to review them in this Article series.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[epigenética]]></kwd>
<kwd lng="es"><![CDATA[etiopatogenia]]></kwd>
<kwd lng="es"><![CDATA[enfermedades autoinmunes sistémicas]]></kwd>
<kwd lng="en"><![CDATA[epigenetics]]></kwd>
<kwd lng="en"><![CDATA[pathogenesis]]></kwd>
<kwd lng="en"><![CDATA[autoimmune systemic diseases]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  	     <p align="right"><font face="verdana" size="2"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>  	     <p align="left">&nbsp;</p>     <p align="left"><font face="verdana" size="2"><b><font size="4">Epigen&eacute;tica    y enfermedades autoinmunes sist&eacute;micas</font></b></font></p>     <p align="left">&nbsp;</p>     <p align="left"><font face="verdana" size="2"><b><font size="3">Epigenetics    and autoimmune systemic diseases</font></b></font></p>     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p>     <p align="left"><font face="verdana" size="2"><b>Ana Mar&iacute;a Torres Lima    <sup>I</sup>, Ana Yolanda Rodr&iacute;guez Torres <sup>II</sup></b></font></p>     <p align="left"><font face="verdana" size="2"><sup>I</sup> MSc. Especialista de    2do. Grado en Inmunolog&iacute;a. Centro de Reumatolog&iacute;a. Hospital Docente    Cl&iacute;nico Quir&uacute;rgico 10 de Octubre. Facultad de Ciencias M&eacute;dicas    10 de Octubre. Universidad de Ciencias M&eacute;dicas de la Habana. La Habana,    Cuba.    ]]></body>
<body><![CDATA[<br>   </font><font face="verdana" size="2"><sup>II</sup> Residente de 2do a&ntilde;o    de Bioqu&iacute;mica Cl&iacute;nica. Instituto de Ciencias B&aacute;sicas y    Precl&iacute;nicas Victoria de Gir&oacute;n. Universidad de Ciencias M&eacute;dicas    de la Habana. La Habana, Cuba.</font></p>  	     <p align="left">&nbsp;</p>     <p align="left">&nbsp;</p> <hr>     <p align="left"><font face="verdana" size="2"><b>RESUMEN</b></font></p>  	     <p align="left"><font face="verdana" size="2">La epigen&eacute;tica, como ciencia    que estudia la&nbsp; modificaciones heredables en la funci&oacute;n del genoma    que se realizan sin cambios&nbsp; en la secuencia del ADN, est&aacute; atrayendo    una atenci&oacute;n creciente entre la comunidad cient&iacute;fica, por su contribuci&oacute;n    en la patogenia de un grupo numeroso de enfermedades, en sus enfoques terap&eacute;uticos    e incluso en la prevenci&oacute;n de las mismas. &nbsp;Las enfermedades autoinmunes    sist&eacute;micas &nbsp;tienen una etipatogenia multifactorial compleja y en    los &uacute;ltimos a&ntilde;os las evidencias tanto cl&iacute;nicas, como experimentales,    de la influencia que ejercen los cambios en el epigenoma, en estas entidades    cl&iacute;nicas, son numerosas y pretendemos abordarlas en esta serie de art&iacute;culos    de revisi&oacute;n.</font></p>     <p align="left"><font face="verdana" size="2"><b>Palabras clave:</b> epigen&eacute;tica,&nbsp;    etiopatogenia, enfermedades autoinmunes sist&eacute;micas.</font></p> <hr>     <p align="left"><font face="verdana" size="2"><b>ABSTRACT</b></font></p>  	     <p align="left"><font face="verdana" size="2">Epigenetics as the science about    inheritables modifications of genetic information without DNA sequence changes,    is atracting an increasing focus among scientific community, for his contribution    in pathogenesis, therapeutic approaches and even in prevention of many diseases.    Systemic autoimmune diseases have a multifactorial complex pathogenesis and    in the last few years there are numerous clinical and experimental evidences,    about the influence of epigenoma changes in these diseases, so we pretend to    review them in this Article series.</font></p>     <p align="left"><font face="verdana" size="2"><b>Keywords:</b> epigenetics, pathogenesis,    autoimmune systemic diseases</font></p> <hr>     <p align="left">&nbsp;</p>  	    ]]></body>
<body><![CDATA[<p align="left"><font face="verdana" size="2">&nbsp;</font></p>  	     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt'><font face="verdana" size="2"><b><font size="3">INTRODUCCI&Oacute;N</font></b></font></p>  	     <p align="left"><font face="verdana" size="2">Cuando se revisa la literatura m&eacute;dica    reciente de la &uacute;ltima d&eacute;cada, que trata sobre la etiopatogenia,    los diferentes enfoques terap&eacute;uticos e incluso la prevenci&oacute;n de    las enfermedades reum&aacute;ticas, un t&eacute;rmino es recurrente: Epigen&eacute;tica    y aunque est&eacute; sobreentendido en la pr&aacute;ctica m&eacute;dica cotidiana,    no es a&uacute;n un t&eacute;rmino muy divulgado en nuestro medio, a pesar de    su uso creciente, pretendemos acercarnos con una serie de art&iacute;culos de    revisi&oacute;n a este tema y las evidencias crecientes sobre su relaci&oacute;n    con las enfermedades&nbsp; autoinmunes.</font></p>     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt' align="left">&nbsp;</p>     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt'><font face="verdana" size="2"><b><font size="3">DESARROLLO</font></b></font></p>  	     <p align="left"><font face="verdana" size="2">Como es bien conocido, desde los    estudios de Watson y Crick que les valieran&nbsp; el premio nobel en medicina    y fisiolog&iacute;a en el a&ntilde;o 1962&nbsp; la informaci&oacute;n gen&eacute;tica    est&aacute; contenida en el &aacute;cido desoxirribonucleico (ADN), en forma    de pares de bases nucleot&iacute;dicas de citosina&#45;adenina, guanina&#45;timidina,    cuya lectura, traducci&oacute;n y expresi&oacute;n en forma de &aacute;cido    ribonucleico (ARN),&nbsp; para posteriormente dar lugar a la s&iacute;ntesis    de prote&iacute;nas, que forman parte de la estructura y ejercen las funciones    vitales; es un fen&oacute;meno bioqu&iacute;micamente complejo y estrictamente    programado que comienza en cada individuo y en cada c&eacute;lula, desde que    ocurre la fecundaci&oacute;n hasta la muerte.<sup>1</sup></font></p>     <p align="left"><font face="verdana" size="2">Hasta hace relativamente poco tiempo,    los conocimientos disponibles hac&iacute;an pensar que en los genes pr&aacute;cticamente    "estaba programado" todo el proceso vital de cada individuo, excluyendo aquellos    trastornos en que est&aacute;n alterados genes que codifican estructuras y funciones    que se ponen de manifiesto desde el nacimiento y que son objeto de la atenci&oacute;n    de los estudiosos de la gen&eacute;tica, tambi&eacute;n es conocido que en la    informaci&oacute;n gen&eacute;tica "est&aacute;n escritas las instrucciones    precisas" sobre pr&aacute;cticamente todas las estructuras y funciones de cada    individuo, desde cu&aacute;les son las caracter&iacute;sticas fenot&iacute;picas    de cada individuo, la susceptibilidad a responder de manera normal ante est&iacute;mulos    antig&eacute;nicos normales o de tener una respuesta catalogada como de hipersensibilidad    ante los mismos, o&nbsp; la mayor o menor respuesta ante un est&iacute;mulo    doloroso o placentero, o la susceptibilidad a padecer determinadas enfermedades    por la menor o mayor capacidad de responder ante diversos microorganismos, hasta    la posibilidad de que un f&aacute;rmaco pueda causar toxicidad.<sup>2,3</sup></font></p>     <p align="left"><font face="verdana" size="2">A pesar de este aparente "determinismo    gen&eacute;tico absoluto" es ciencia constituida que individuos que comparten    el mismo patrimonio gen&eacute;tico, como los gemelos monocig&oacute;ticos,    si est&aacute;n expuestos a diferentes est&iacute;mulos del ambiente, expresaban    diversas caracter&iacute;sticas fenot&iacute;picas, que pod&iacute;an ser incluso    enfermedades.<sup>4&#45;8</sup></font></p>     <p align="left"><font face="verdana" size="2">    <br>   En 1942 Conrad Waddington introdujo el t&eacute;rmino de Epigen&eacute;tica    para definir las interacciones causales entre los genes y sus productos que    se traduc&iacute;an como diferencias fenot&iacute;picas.<sup>9</sup> Este t&eacute;rmino    ha sido redefinido y como consenso se establece que la epigen&eacute;tica es    el conjunto de cambios heredables colectivamente debido a procesos que surgen    independientemente de la secuencia primaria de ADN. La heredabilidad de esta    informaci&oacute;n epigen&eacute;tica durante muchos a&ntilde;os se pens&oacute;    que estaba limitada a la divisi&oacute;n celular, pero actualmente se considera    que los procesos epigen&eacute;ticos pueden transferirse en los organismos de    una generaci&oacute;n a la siguiente.<sup>10,11</sup></font></p>  	     ]]></body>
<body><![CDATA[<p align="left"><font face="verdana" size="2">En los &uacute;ltimos a&ntilde;os    el t&eacute;rmino epigen&eacute;tica se ha hecho m&aacute;s y m&aacute;s recurrente    cuando se trata de comprender la patogenia de muchas entidades cl&iacute;nicas    e incluso la respuesta terap&eacute;utica a los f&aacute;rmacos, en cuanto a    divergencias que aparecen en individuos que comparten caracter&iacute;sticas    similares en el genoma, as&iacute; como la influencia que tiene el ambiente    y sus cambios en la expresi&oacute;n de genes que regulan de manera positiva    o negativa, para que aquellas entidades cl&iacute;nicas que tienen entre su    factores etiol&oacute;gicos, las alteraciones de los genes, existan variaciones    en algunos pacientes, en cuanto a la severidad de las manifestaciones cl&iacute;nicas,    por la expresi&oacute;n en diversos momentos de genes diferentes.<sup>12&#45;25</sup></font></p>  	     <p align="left"><font face="verdana" size="2">El epigenoma comprende aquellos    cambios que se producen en la informaci&oacute;n gen&eacute;tica por la metilaci&oacute;n    del ADN que provoca cambios en su estructura espacial, o las modificaciones    en las histonas o en el denominado ARN&#45;no codificante, es decir, cambios    de forma de la cromatina, estos cambios son producidos por modificaciones bioqu&iacute;micas    del tipo Metilaci&oacute;n, Acetilaci&oacute;n o Fosforilaci&oacute;n y alteran    la etapa de transcripci&oacute;n en la s&iacute;ntesis de prote&iacute;nas,    por tanto se modifica toda la programaci&oacute;n celular, dando lugar a fenotipos    m&aacute;s amplios. Seg&uacute;n los estudiosos del tema, el epigenoma se encuentra    en un estado denominado metastable, es decir, lo suficientemente estable para    mantener&nbsp; a las c&eacute;lulas funcionales, pero al mismo tiempo, este    estado es din&aacute;mico y permite responder a aquellos&nbsp; factores ambientales    o del desarrollo que pueden alterar este&nbsp; funcionamiento. Las alteraciones    en el epigenoma que son resultado de la evoluci&oacute;n, como respuesta a los    cambios del ambiente, tales como una infecci&oacute;n, pueden producir epi&#45;mutaciones    que son transmitidas a las c&eacute;lulas hijas.<sup>13, 26&#45;37</sup></font></p>  	    <p style='margin&#45;top:12.0pt'><font face="verdana" size="2">Estas epi&#45;mutaciones pueden tener un impacto muy significativo en el funcionamiento celular y conducir a un estado de enfermedad y est&aacute; muy bien documentado este fen&oacute;meno en las enfermedades neopl&aacute;sicas: &nbsp;A la luz de los cambios epigen&eacute;ticos podemos explicar fen&oacute;menos como la influencia del tabaquismo en la desrepresi&oacute;n de oncogenes que confieren caracter&iacute;sticas de malignidad &nbsp;a las c&eacute;lulas del &aacute;rbol traqueobronquial, donde la exposici&oacute;n a los qu&iacute;micos irritantes nos dar&iacute;an una causa muy evidente de los cambios celulares que conducen a la oncoproliferaci&oacute;n, tambi&eacute;n est&aacute;n involucrados las modificaciones epigen&eacute;ticas en la aparici&oacute;n de otras neoplasias, vinculadas a infecciones previas con algunos microorganismos, como se ha sugerido en el caso del c&aacute;ncer g&aacute;strico y el H. pilori.<sup>38&#45;45</sup></font></p>  	     <p align="left"><font face="verdana" size="2">Las modificaciones adquiridas en    el ADN, &nbsp;o en las histonas, es decir, los cambios epigen&eacute;ticos,    se ha demostrado que se encuentran involucradas en la patogenia de otras enfermedades    no oncol&oacute;gicas, entre las que encontramos las enfermedades autoinmunes    sist&eacute;micas, tambi&eacute;n relacionadas con factores ambientales, como    el humo del tabaco, tales como la Artritis reumatoidea con infecciones previas    con determinados microorganismos como en las espondiloartropat&iacute;as, o    con la exposici&oacute;n a agentes f&iacute;sicos, como la luz ultravioleta,    en el caso del lupus eritematoso sist&eacute;mico.<sup>46&#45;53</sup></font></p>     <p align="left"><font face="verdana" size="2">En fechas recientes los investigadores    que trabajan en el campo de la epigen&eacute;tica, han estudiado c&oacute;mo    en las enfermedades autoinmunes, que &nbsp;en su patogenia multifactorial, intervienen    diversos genes que confieren una mayor susceptibilidad de padecerlas a ciertos    individuos de la poblaci&oacute;n, en diferentes etnias. En estas enfermedades    que son gen&eacute;ticamente complejas, para que un individuo llegue desarrollar    los signos y s&iacute;ntomas cl&iacute;nicos que est&aacute;n relacionados con    la p&eacute;rdida de la tolerancia a lo propio, est&aacute;n involucrados m&uacute;ltiples    genes que codifican no s&oacute;lo para la respuesta inmune espec&iacute;fica,    si no que &nbsp;en algunas de estas entidades, se ha comprobado que los pacientes    sufren adem&aacute;s de alteraciones en los genes que codifican para sustancias    que forman parte de la denominada inmunidad innata o inespec&iacute;fica y que    estos genes codifican, prote&iacute;nas &nbsp;como las que intervienen en la    cascada del complemento, o las citocinas que tienen funciones proinflamatorias,    que son participantes indispensables en la amplificaci&oacute;n de la respuesta,    autoinmune.<sup>54&#45;60</sup></font></p>     <p align="left"><font face="verdana" size="2">En este contexto, es razonable suponer    que la epigen&eacute;tica en estas enfermedades, contribuye a los cambios din&aacute;micos    de fenotipos, es decir al cambio de algunas caracter&iacute;sticas como la edad    de debut de la enfermedad, recurrencia de las crisis, severidad de los s&iacute;ntomas,    duraci&oacute;n de las remisiones o la respuesta a los tratamientos medicamentosos.<sup>61&#45;67</sup></font></p>  	     <p align="left"><font face="verdana" size="2">Como es bien conocido los des&oacute;rdenes    autoinmunes como las endocrinopat&iacute;as, la aterosclerosis y algunas enfermedades    reum&aacute;ticas, progresan con el envejecimiento, la clave puede estar en    que a lo largo de la vida, existe una reprogramaci&oacute;n constante del epigenoma    de las c&eacute;lulas inmunitarias como resultado de la exposici&oacute;n a    los factores ambientales&nbsp; que en la medida en la que el tiempo transcurre,    puede ir alejando al organismo de la tolerancia a lo propio. Los mecanismos    epigen&eacute;ticos regulan la expresi&oacute;n de los genes y son sensibles    a est&iacute;mulos externos, por lo que se puede decir que constituyen una forma    de&nbsp; interacci&oacute;n del medio ambiente sobre la informaci&oacute;n contenida    en los genes y en el caso de las enfermedades autoinmunes son el puente que    une a los factores gen&eacute;ticos y ambientales que intervienen en la patogenia    de estas entidades. La comprensi&oacute;n de c&oacute;mo los mecanismos epigen&eacute;ticos    pueden alterar la expresi&oacute;n gen&eacute;tica y por tanto, la funci&oacute;n    celular, ha conducido a nuevas interpretaciones de c&oacute;mo los agentes ambientales    pueden contribuir al desarrollo de enfermedades en individuos gen&eacute;ticamente    predispuestos.<sup>68&#45;74</sup></font></p>     <p align="left"><font face="verdana" size="2">En a&ntilde;os recientes, diversos    estudios, tanto cl&iacute;nicos, como en modelos experimentales, proponen que    el epigenoma puede constituir el elemento clave para la adecuada comprensi&oacute;n    de la iniciaci&oacute;n y perpetuaci&oacute;n de la autoinmunidad, m&aacute;s    espec&iacute;ficamente hay datos que respaldan el impacto de los cambios epigen&eacute;ticos    en el lupus eritematoso sist&eacute;mico, la artritis reumatoide, la esclerosis    m&uacute;ltiple y otras enfermedades&nbsp; autoinmunes.<sup>65&#45;68</sup></font></p>     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt' align="left">&nbsp;</p>     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt'><font face="verdana" size="2"><b><font size="3">CONCLUSIONES</font></b></font></p>  	     ]]></body>
<body><![CDATA[<p align="left"><font face="verdana" size="2">Hemos hecho una revisi&oacute;n    de los principales conceptos que se han desarrollado en los &uacute;ltimos tiempos    alrededor de la relaci&oacute;n entre epigen&eacute;tica y las enfermedades    autoinmunes, esperando motivar el estudio de estos temas, y la intenci&oacute;n    de continuar profundizando en su conocimiento a trav&eacute;s de la investigaci&oacute;n    y la divulgaci&oacute;n de sus resultados en nuestros &oacute;rganos de difusi&oacute;n    cient&iacute;fica.</font></p>  	     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt'>&nbsp;</p>     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt' align="left"><font face="verdana" size="2"><b><font size="3">REFERENCIAS    BIBLIOGR&Aacute;FICAS</font></b></font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">1. Watson JD, Crick FHC. Molecular    Structure of Nucleic Acids. A Structure for Deoxyribose Nucleic Acid. Nature    1953;171: 737-8.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">2. Hern&aacute;ndez Fern&aacute;ndez    R. La expresi&oacute;n de la informaci&oacute;n gen&eacute;tica En Introducci&oacute;n    a la Gen&eacute;tica M&eacute;dica Lantig&uuml;a Cruz A. La Habana: Editorial    Ciencias M&eacute;dicas; 2004, 27-41.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">3. Bell CG, Beck S. The epigenomic    interface between genome and environment in common complex diseases. Brief.    Funct. Genomics. 2010;9:477-85.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">4. Fraga MF, Ballestar E, Paz MF,    Ropero S, Setien F, Ballestar ML, Esteller M. Epigenetic differences arise during    the lifetime of monozygotic twins. Proc. Natl Acad. Sci. USA. 2005;102:10604-9.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">5. Kaminsky ZA, Tang T, Wang SC,    Ptak C, Oh G H, Wong AH, Petronis, A. DNA methylation profiles in monozygotic    and dizygotic twins. Nat. Genet. 2009;41:240-5.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">6. Baranzini SE, Mudge J, van Velkinburgh    J C, Khankhanian P, Khrebtukova I, Miller NA, Kingsmore SF. Genome, epigenome    and RNA sequences of monozygotic twins discordant for multiple sclerosis. Nature.    2010;464:135-6.     </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">7. Runyon RS, Cachola LM, Rajeshuni    N, Hunter T, Garcia M, Ahn R, Lurmann F, Krasnow R, Jack LM, Miller RL, Swan    GE, Kohli A, Jacobson AC, Nadeau KC. Asthma discordance in twins is linked to    epigenetic modifications of T cells. PLoS One. 2012; 7:e48796.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">8. Grundberg E, Small KS, Hedman    AK, Nica AC, Buil A, Keildso, S, Dermitzakis ET. Mapping cis- and trans-regulatory    effects across multiple tissues in twins. Nat. Genet. 2012;12:1084-9.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">9. Waddington CH. The epigenotype.    Endevour. 1942;1:18-20.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">10. Liu I, Li Y, Tollefsbol TO.    Gene-environment interactions and epigenetic basis of human diseases. Curr Iss    Mol Biol. 2008;10:25-36.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">11.Chong S, Whitelaw E. Epigenetic    germline inheritance. Curr Opin Genet Dev. 2004;14:692-6.     </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">12. Vedove CD, Del Giglio M, Schena    D, Girolomoni G. Drug-induced lupus erythematosus. Arch Dermatol Res 2009;301:99-105.    </font></p>     <!-- ref --><p align="left"><font face="verdana" size="2">13. Berger SL, Kouzarides T, Shiekhattar    R, Shilatifard A. An operational definition of epigenetics. Genes Dev. 2009;23,781-3.    doi: 10.1101/gad.1 </font><!-- ref --><p align="left"><font face="verdana" size="2">14. Bell CG, Beck S. The epigenomic    interface between genome and environment in common complex diseases. Brief.    Funct. Genomics. 2010;9:477-85.    </font></p>     ]]></body>
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<body><![CDATA[<p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt'>&nbsp;</p>     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt'>&nbsp;</p>     <p style='margin&#45;bottom:0cm;margin&#45;bottom:.0001pt' align="left"><font face="verdana" size="2">Contacto    para la correspondencia: <i>Dra. Ana Mar&iacute;a Torres Lima</i> E&#45;mail:    <a href="mailto:amtl@infomed.sld.cu">amtl@infomed.sld.cu    <br>   </a></font><font face="verdana" size="2">Centro de Reumatolog&iacute;a. Calzada    de 10 de Octubre No 122, esquina Agua Dulce. Cerro. La Habana, Cuba.</font></p>  	     ]]></body><back>
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