<?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>0121-0793</journal-id>
<journal-title><![CDATA[Iatreia]]></journal-title>
<abbrev-journal-title><![CDATA[Iatreia]]></abbrev-journal-title>
<issn>0121-0793</issn>
<publisher>
<publisher-name><![CDATA[Universidad de Antioquia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0121-07932011000400006</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Alteraciones del gen c-Myc en la oncogénesis]]></article-title>
<article-title xml:lang="en"><![CDATA[C-Myc gene alterations in oncogenesis]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Ospina Pérez]]></surname>
<given-names><![CDATA[Mariano]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Muñetón Peña]]></surname>
<given-names><![CDATA[Carlos Mario]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad de Antioquia Instituto de Biología ]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad de Antioquia Facultad de Medicina Departamento de Pediatría]]></institution>
<addr-line><![CDATA[Medellín ]]></addr-line>
<country>Colombia</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>12</month>
<year>2011</year>
</pub-date>
<volume>24</volume>
<numero>4</numero>
<fpage>389</fpage>
<lpage>401</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_arttext&amp;pid=S0121-07932011000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_abstract&amp;pid=S0121-07932011000400006&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.co/scielo.php?script=sci_pdf&amp;pid=S0121-07932011000400006&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[La familia de protooncogenes MYC (c-Myc, N-Myc y L-Myc) se relaciona con el origen de diversas neoplasias en seres humanos. Estos genes actúan como factores de transcripción y participan en la regulación del ciclo celular, la proliferación y diferenciación celulares, la apoptosis y la inmortalización. Los genes MYC se expresan en diferentes tejidos y responden a diversas señales internas y externas; codifican para la síntesis de factores de transcripción que se unen al ADN para regular la expresión de múltiples genes. El gen más ampliamente estudiado de esta familia es c-Myc, que se expresa en las células con mayor tasa de proliferación. C-Myc se encuentra alterado en un gran número de tumores sólidos, leucemias y linfomas. Las alteraciones de c-Myc encontradas con mayor frecuencia en células cancerosas son las amplificaciones, translocaciones, mutaciones y reordenamientos cromosómicos que involucran el locus de este gen y conducen a que se desregule su expresión en diversas neoplasias humanas. La amplificación de c-Myc es una alteración común en los cánceres de mama, pulmón, ovario y próstata, así como en leucemias y linfomas, mientras que la pérdida de su regulación es común en el cáncer de colon, en tumores ginecológicos y melanoma. En neoplasias con defectos de c-Myc los estudios actuales están dirigidos al desarrollo de nuevas estrategias terapéuticas.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The family of MYC proto-oncogenes (c-Myc, N-Myc and L-Myc) is related to various types of cancer in humans. These genes act as transcription factors and are involved in cell cycle regulation as well as in the immortalization, apoptosis, proliferation and cell differentiation. They are expressed in different tissues and respond to various internal and external signals. They code for the synthesis of transcription factors that bind to DNA to modulate the expression of different genes. The most widely studied gene in this family is c-Myc, which expresses in cells with higher rate of proliferation. This gene shows alterations in many solid tumors, leukemias, and lymphomas. The most widely found alterations of c-Myc in cancer cells are amplifications, translocations, point mutations, and chromosomal rearrangements that involve its locus and lead to dys-regulation of its expression in different human malignancies. Amplification of c-Myc is frequent in breast, lung, ovarian and prostate cancers, as well as in leukemias and lymphomas. Loss of its regulation is common in colon cancer, gynecological tumors and melanoma. In tumors with c-Myc deffects present studies aim at the development of new therapeutic strategies.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[Amplificación]]></kwd>
<kwd lng="es"><![CDATA[Factores de transcripción]]></kwd>
<kwd lng="es"><![CDATA[Neoplasias]]></kwd>
<kwd lng="es"><![CDATA[Protooncogén c-Myc]]></kwd>
<kwd lng="en"><![CDATA[Amplification]]></kwd>
<kwd lng="en"><![CDATA[Neoplasia]]></kwd>
<kwd lng="en"><![CDATA[Proto-oncogen c-Myc]]></kwd>
<kwd lng="en"><![CDATA[Transcription Factors]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[ <p align="right"><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>ART&Iacute;CULO DE REVISI&Oacute;N</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="4" face="Verdana, Arial, Helvetica, sans-serif"> <b>Alteraciones del gen c-Myc en la oncog&eacute;nesis</b></font></p>     <p>&nbsp;</p>     <p align="center"><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>C-Myc gene alterations in oncogenesis</b></font></p>     <p align="center">&nbsp;</p>     <p align="center">&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Mariano Ospina P&eacute;rez<sup>1</sup>; Carlos Mario Mu&ntilde;et&oacute;n Pe&ntilde;a<sup>2</sup></b> </font></p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">1 Estudiante de posgrado de Biolog&iacute;a, Instituto de Biolog&iacute;a, Universidad de Antioquia, Medell&iacute;n, Colombia.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 2 Profesor Asociado, Unidad de Gen&eacute;tica M&eacute;dica,Departamento de Pediatr&iacute;a, Facultad de Medicina, Universidad de Antioquia, Medell&iacute;n, Colombia. <a href="mailto:cmuneton@quimbaya.udea.edu.co">cmuneton@quimbaya.udea.edu.co</a></font></p>     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Recibido: noviembre 26 de 2010    <br>   Aceptado: marzo 2011 </font></p>     <p>&nbsp;</p>     <p>&nbsp;</p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>RESUMEN</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La familia de protooncogenes MYC &#40;c-Myc, N-Myc y L-Myc&#41; se relaciona con el origen de   diversas neoplasias en seres humanos. Estos genes act&uacute;an como factores de transcripci&oacute;n   y participan en la regulaci&oacute;n del ciclo celular, la proliferaci&oacute;n y diferenciaci&oacute;n celulares, la   apoptosis y la inmortalizaci&oacute;n. Los genes MYC se expresan en diferentes tejidos y responden   a diversas se&ntilde;ales internas y externas; codifican para la s&iacute;ntesis de factores de transcripci&oacute;n   que se unen al ADN para regular la expresi&oacute;n de m&uacute;ltiples genes. El gen m&aacute;s ampliamente   estudiado de esta familia es c-Myc, que se expresa en las c&eacute;lulas con mayor tasa de proliferaci&oacute;n.   C-Myc se encuentra alterado en un gran n&uacute;mero de tumores s&oacute;lidos, leucemias y linfomas.   Las alteraciones de c-Myc encontradas con mayor frecuencia en c&eacute;lulas cancerosas son   las amplificaciones, translocaciones, mutaciones y reordenamientos cromos&oacute;micos que   involucran el locus de este gen y conducen a que se desregule su expresi&oacute;n en diversas   neoplasias humanas. La amplificaci&oacute;n de c-Myc es una alteraci&oacute;n com&uacute;n en los c&aacute;nceres de   mama, pulm&oacute;n, ovario y pr&oacute;stata, as&iacute; como en leucemias y linfomas, mientras que la p&eacute;rdida   de su regulaci&oacute;n es com&uacute;n en el c&aacute;ncer de colon, en tumores ginecol&oacute;gicos y melanoma. En   neoplasias con defectos de c-Myc los estudios actuales est&aacute;n dirigidos al desarrollo de nuevas   estrategias terap&eacute;uticas.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>PALABRAS CLAVE</b></font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">   <i>Amplificaci&oacute;n, Factores de transcripci&oacute;n, Neoplasias, Protooncog&eacute;n c-Myc</i>   </font></p> <hr noshade size="1">     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>SUMMARY</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">The family of MYC proto-oncogenes &#40;c-Myc, N-Myc and L-Myc&#41; is related to various types   of cancer in humans. These genes act as transcription factors and are involved in cell cycle   regulation as well as in the immortalization, apoptosis, proliferation and cell differentiation.   They are expressed in different tissues and respond to various internal and external signals. They   code for the synthesis of transcription factors that bind to DNA to modulate the expression of different genes. The most widely studied gene in this   family is c-Myc, which expresses in cells with higher   rate of proliferation. This gene shows alterations in   many solid tumors, leukemias, and lymphomas.   The most widely found alterations of c-Myc in   cancer cells are amplifications, translocations,   point mutations, and chromosomal rearrangements   that involve its locus and lead to dys-regulation   of its expression in different human malignancies.   Amplification of c-Myc is frequent in breast, lung,   ovarian and prostate cancers, as well as in leukemias   and lymphomas. Loss of its regulation is common in   colon cancer, gynecological tumors and melanoma.   In tumors with c-Myc deffects present studies aim at   the development of new therapeutic strategies. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>KEY WORDS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">   <i>Amplification, Neoplasia, Proto-oncogen c-Myc,   Transcription Factors</i>   </font></p> <hr noshade size="1">     <p>&nbsp;</p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>INTRODUCCI&Oacute;N</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La familia de genes MYC es una de las m&aacute;s   ampliamente estudiadas en biolog&iacute;a; est&aacute; constituida   por los protooncogenes c-Myc, N-Myc and L-Myc, que   se relacionan con diferentes neoplasias en humanos.   Las funciones de estos genes en la biolog&iacute;a de las   c&eacute;lulas normales y cancerosas se han estudiado desde   hace m&aacute;s de tres d&eacute;cadas &#40;1&#41;. Dichos genes act&uacute;an   como factores de transcripci&oacute;n y reguladores del ciclo   celular e intervienen en la proliferaci&oacute;n, apoptosis y   diferenciaci&oacute;n celular y en la inmortalizaci&oacute;n &#40;2&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los genes c-Myc, N-Myc and L-Myc se expresan   en diferentes tejidos durante la embriog&eacute;nesis.   Espec&iacute;ficamente, el gen c-Myc se expresa   principalmente en c&eacute;lulas con una mayor tasa de   proliferaci&oacute;n. Por su parte, el N-Myc se expresa a bajos   niveles en diversos tejidos neonatales y especialmente   en c&eacute;lulas pre-B, ri&ntilde;&oacute;n, cerebro e intestino &#40;3, 4&#41;. Por   otra parte, el L-Myc se expresa durante el desarrollo   del ri&ntilde;&oacute;n y el pulm&oacute;n y en los compartimentos de   diferenciaci&oacute;n y proliferaci&oacute;n del cerebro y del tubo   neural. Los tres genes participan activamente en   los mecanismos de se&ntilde;alizaci&oacute;n celular. Adem&aacute;s,   sintetizan factores de transcripci&oacute;n que forman   heterod&iacute;meros con la prote&iacute;na Max, para luego unirse   al ADN; de esta manera, regulan la expresi&oacute;n de   m&uacute;ltiples genes &#40;1,5,6&#41;.   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El gen m&aacute;s ampliamente estudiado de esta familia es el   c-Myc, que fue el primero en ser descubierto mediante   su homolog&iacute;a con el gen transformante del virus de la   mielocitomatosis aviar MC29 &#40;v-Myc&#41; &#40;7&#41;. Los otros dos   genes, N-Myc y L-Myc, se descubrieron posteriormente   por su homolog&iacute;a con el v-Myc en secuencias amplificadas   en c&eacute;lulas de neuroblastoma y en tumores de c&eacute;lulas   peque&ntilde;as del pulm&oacute;n, respectivamente &#40;2,8-10&#41;   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En 1911 Peyton Rous observ&oacute; que el sarcoma del pollo   podr&iacute;a transmitirse mediante extractos libres de c&eacute;lulas   de tumores y sugiri&oacute; que un virus podr&iacute;a ser el agente   etiol&oacute;gico de los sarcomas &#40;11,12&#41;. Con base en el trabajo   de Rous, Bishop y colaboradores &#40;13&#41; llevaron a cabo un   estudio en un subgrupo espec&iacute;fico de retrovirus aviares,   que inclu&iacute;a diversos tumores en pollos, como leucemia   mieloide, tumores de h&iacute;gado, ri&ntilde;&oacute;n y sarcomas; estos   estudios condujeron a la identificaci&oacute;n del oncog&eacute;n   v-Myc en pollos. Luego, con el descubrimiento de un gen   hom&oacute;logo, denominado c-Myc en pollos, se corrobor&oacute;   la hip&oacute;tesis de que los retrovirus aviares oncog&eacute;nicos   podr&iacute;an interaccionar con genes reguladores del   crecimiento celular y transmitir el gen activado.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Por otra parte, se encontr&oacute; que el gen c-Myc se   encuentra alterado en diversos tumores s&oacute;lidos,   leucemias y linfomas, as&iacute; como en diferentes tumores   en animales &#40;2,14-16&#41;. En las c&eacute;lulas neopl&aacute;sicas es muy   frecuente que se presente la amplificaci&oacute;n del gen c-Myc   en tumores hematopoy&eacute;ticos debido a translocaciones   cromos&oacute;micas o aneuploid&iacute;as. Estas alteraciones   inducen una desregulaci&oacute;n de la expresi&oacute;n del gen.   Se sabe que en el locus del gen c-Myc &#40;8q24&#41; ocurren   frecuentemente reordenamientos cromos&oacute;micos,   adem&aacute;s de integraci&oacute;n de virus oncog&eacute;nicos que   promueven modificaciones funcionales o estructurales   &#40;17,18&#41;. Entre las alteraciones cromos&oacute;micas m&aacute;s   comunes que involucran al locus del c-Myc est&aacute; la   translocaci&oacute;n t&#40;8;14&#41; presente en el linfoma de Burkitt   &#40;LB&#41; &#40;18-20&#41;. As&iacute;, el gen c-Myc translocado act&uacute;a de   forma defectuosa. De otro lado, la amplificaci&oacute;n del   gen c-Myc es muy frecuente en el c&aacute;ncer de mama,   pulm&oacute;n, ovario, pr&oacute;stata, leucemias y linfomas;   mientras que la p&eacute;rdida de la regulaci&oacute;n es m&aacute;s   com&uacute;n en el c&aacute;ncer de colon, tumores ginecol&oacute;gicos y   melanoma &#40;1,18,20&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El prop&oacute;sito de esta revisi&oacute;n es describir la estructura   y funci&oacute;n del gen c-Myc, as&iacute; como su papel en los   diferentes mecanismos celulares en que participa.   Tambi&eacute;n, ilustrar sobre los mecanismos gen&eacute;ticos   propuestos en relaci&oacute;n con la oncog&eacute;nesis en humanos.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b> Estructura y funci&oacute;n del gen c-Myc</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El proto-oncog&eacute;n c-Myc participa en una amplia   red de v&iacute;as metab&oacute;licas, y por esta raz&oacute;n tiene   m&uacute;ltiples funciones como son la progresi&oacute;n del   ciclo celular, metabolismo celular, angiog&eacute;nesis,   adherencia celular, reparaci&oacute;n del ADN, apoptosis y   diferenciaci&oacute;n celulares &#40;1&#41; &#40;<a href="#f1">figura 1</a>&#41;.</font></p>     <p align="center"><a name="f1"></a><img src="img/revistas/iat/v24n4/v24n4a6f1.jpg"></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El gen c-Myc fue descubierto hace m&aacute;s de 25 a&ntilde;os   como un oncog&eacute;n retroviral aviar &#40;v-Myc&#41; en c&eacute;lulas   infectadas por el virus de transformaci&oacute;n aguda MC29,   el cual induce mielocitomatosis y tumores en pollos;   posteriormente se identific&oacute; el c-Myc en humanos y   en otros vertebrados por su homolog&iacute;a celular con el   v-Myc &#40;1,13,21&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El c-Myc se localiza en la regi&oacute;n cromos&oacute;mica 8q24.   Codifica para una prote&iacute;na con funci&oacute;n de factor de   transcripci&oacute;n nuclear, que interviene en numerosos   mecanismos celulares y v&iacute;as de transducci&oacute;n. En   c&eacute;lulas normales el c-Myc se encuentra bien regulado,   en contraste con la desregulaci&oacute;n que presenta en las   c&eacute;lulas cancerosas &#40;9,19-22&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El gen c-Myc se compone de tres exones. El ex&oacute;n 1   tiene dos promotores y no codifica. Los exones 2 y 3   codifican para la prote&iacute;na Myc que tiene un sitio de   inicio para la traducci&oacute;n en el nucle&oacute;tido 16 del ex&oacute;n   2 &#40;20&#41;; en dicho sitio se sintetiza una prote&iacute;na c-Myc   de 64 kDa constituida por 439 amino&aacute;cidos y presenta   una traducci&oacute;n alternativa que origina dos tipos de   prote&iacute;nas, una de secuencia larga y otra de secuencia   corta, denominadas p67 Myc &#40;67 kDa&#41; y MycS &#40;45 kDa&#41;.   Otros autores tambi&eacute;n informan un polip&eacute;ptido de   c-Myc de 45-kDa. De otro lado, se tiene un inter&eacute;s   particular en las diferentes funciones de dos productos   alternativos del gen c-Myc: c-Myc 1 y c-Myc 2. La prote&iacute;na   c-Myc 2 estimula el crecimiento celular, mientras que   c-Myc 1 lo suprime; o sea, que las actividades de estas   dos prote&iacute;nas son antag&oacute;nicas &#40;23&#41;. Esta situaci&oacute;n,   sumada a la ocurrencia de mutaciones en el gen c-Myc   en neoplasias humanas, hace m&aacute;s complejo el estudio   del papel de este gen en dichas c&eacute;lulas. </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por otra parte, se sabe que la p&eacute;rdida de la regulaci&oacute;n   de la expresi&oacute;n del gen c-Myc ocurre por diferentes   mecanismos gen&eacute;ticos, tales como la amplificaci&oacute;n,   alteraciones cromos&oacute;micas num&eacute;ricas y estructurales,   inserci&oacute;n viral o mutaciones puntuales; estas   alteraciones se relacionan con la transformaci&oacute;n e   inmortalizaci&oacute;n de las c&eacute;lulas neopl&aacute;sicas &#40;1,24&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Como resultado de m&uacute;ltiples estudios sobre la   regulaci&oacute;n de la expresi&oacute;n del gen c-Myc, se ha   informado la existencia de una gran variedad de   factores de transcripci&oacute;n que interaccionan con &eacute;l.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El gen c-Myc se regula por mecanismos complejos de   transcripci&oacute;n y postranscripci&oacute;n. Se conocen cuatro   promotores de transcripci&oacute;n, pero el ARN sintetizado   a partir del promotor P2 contribuye con 80&#37; a 90&#37;   del total del ARN en las c&eacute;lulas normales &#40;25,26&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En las c&eacute;lulas humanas normales el gen c-Myc se   transcribe en diferentes tejidos, mientras que en   c&eacute;lulas neopl&aacute;sicas la transcripci&oacute;n se lleva a cabo   de forma anormal &#40;22&#41;. La actividad oncog&eacute;nica del   c-Myc se demostr&oacute; en animales transg&eacute;nicos y en   estudios <i>in vitro</i> con cultivos celulares &#40;27&#41;. Asimismo,   se encontr&oacute; que una deleci&oacute;n homocig&oacute;tica del gen   c-Myc es letal en embriones murinos, lo que sugiere   que la expresi&oacute;n de este gen es esencial para el   desarrollo embrionario &#40;28&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> <b>Estructura y funci&oacute;n de la prote&iacute;na c-Myc</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Los protooncogenes codifican para prote&iacute;nas   reguladoras de la transcripci&oacute;n, que son fundamentales   para muchos procesos celulares. Estas prote&iacute;nas,   cuando se expresan de una forma anormal, act&uacute;an   como oncoprote&iacute;nas por lo que se asocian con el   desarrollo de diversas neoplasias &#40;16,29-31&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> La prote&iacute;na c-Myc es una fosfoprote&iacute;na nuclear de   439 amino&aacute;cidos que juega un papel importante en la   regulaci&oacute;n de la expresi&oacute;n g&eacute;nica en c&eacute;lulas humanas;   generalmente forma complejos de cremallera de   leucina &#40;LZ, por la sigla en ingl&eacute;s de <i>leucine zipper</i>&#41;   con otras mol&eacute;culas &#40;8,9&#41;. Adem&aacute;s, tiene varias   secuencias estructurales conservadas y posee dos   dominios principales. El primero es un motivo de   dimerizaci&oacute;n, denominado <i>helix-loop-helix leucine     zipper</i> &#40;HLH/LZ&#41; en el residuo C-terminal que consta   de 90 amino&aacute;cidos; este dominio se requiere para la   dimerizaci&oacute;n con otras prote&iacute;nas y con el ADN &#40;28,32&#41;.   Adem&aacute;s, el dominio HLH/LZ permite la dimerizaci&oacute;n   homot&iacute;pica o heterot&iacute;pica con otras prote&iacute;nas HLH/   LZ, como ocurre con la heterodimerizaci&oacute;n con la   prote&iacute;na Max y con la uni&oacute;n al ADN en una secuencia   espec&iacute;fica E-box, denominada sitio Myc E-box o EMS   &#40;por la sigla en ingl&eacute;s de <i>E-box Myc Site</i>&#41;; la alteraci&oacute;n   de este dominio destruye la actividad biol&oacute;gica de la   prote&iacute;na, indicando que la uni&oacute;n al ADN es esencial   para su funci&oacute;n &#40;33&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El segundo dominio comprende una gran parte de   la prote&iacute;na c-Myc y se define como el dominio de   transactivaci&oacute;n. La regi&oacute;n N-terminal de c-Myc tiene   140 amino&aacute;cidos y contiene grupos &aacute;cidos ricos en   prolina y glutamina, similares a los asociados con   algunos dominios de transactivaci&oacute;n &#40;28, 33-35&#41;; la   secuencia de la prote&iacute;na c-Myc posee varios dominios   N-terminales conservados, que se denominan <i>cajas     Myc</i>, y se encuentran en prote&iacute;nas hom&oacute;logas   relacionadas, como N-Myc y L-Myc. La regi&oacute;n rica   en glutamina de c-Myc es esencial para la actividad   oncog&eacute;nica. Adem&aacute;s, el dominio N-terminal,   denominado <i>dominio de activaci&oacute;n transcripcional</i> &#40;TAD&#41; &#40;amino&aacute;cidos 1 a 143&#41; contiene un elemento rico   en prolina que se extiende desde el amino&aacute;cido 41 hasta   el 103 &#40;36&#41;. El dominio TAD es necesario para activar   la transcripci&oacute;n de c-Myc y para la transformaci&oacute;n   celular, la inhibici&oacute;n de la diferenciaci&oacute;n celular y la   inducci&oacute;n de la apoptosis mediada por c-Myc &#40;28,37&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">De otro lado, en 1991 se identific&oacute; la prote&iacute;na Max   que interact&uacute;a con la prote&iacute;na c-Myc para formar un   heterod&iacute;mero Myc-Max, complejo que se une luego   al ADN &#40;38&#41;. La prote&iacute;na c- Myc tiene una vida media   corta, de aproximadamente 20 minutos, mientras   que la de la prote&iacute;na Max es mayor de 24 horas; por   lo tanto, en muchos sistemas, la prote&iacute;na c-Myc es   el componente limitante del heterod&iacute;mero, lo cual   es clave en la regulaci&oacute;n de la transcripci&oacute;n g&eacute;nica   en diversos mecanismos como la proliferaci&oacute;n y   diferenciaci&oacute;n celulares y la apoptosis &#40;5,6,33&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La dimerizaci&oacute;n de las prote&iacute;nas Myc y Max mediante   los dominios HLH/LZ es importante para la uni&oacute;n de   este complejo con el ADN en secuencias espec&iacute;ficas   de hexanucle&oacute;tidos, denominadas <i>cajas E</i> &#40;E boxes&#41;   &#40;5'-CA&#91;C/T&#93;GTG-3'&#41; &#40;33&#41;. Por esta v&iacute;a, c-Myc activa   la transcripci&oacute;n de promotores que contienen la   secuencia CACGTG &#40;39&#41;. El heterod&iacute;mero Myc-Max   unido al ADN, interacciona a trav&eacute;s de la regi&oacute;n N-terminal de Myc con una variedad de prote&iacute;nas   involucradas en la transcripci&oacute;n de m&uacute;ltiples genes;   entre estas prote&iacute;nas se incluyen las TRRAP &#40;por la   sigla en ingl&eacute;s de <i>transactivation-transformation     domain-associated proteins</i>&#41;, que se asocian con la   histona acetilasa GCN5 &#40;40&#41;. La acetilaci&oacute;n de histonas   puede luego marcar la cromatina para permitir el   acceso de factores de transcripci&oacute;n que pertenecen a   la maquinaria de aquellos de tipo general &#40;5&#41;.   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por otra parte, en estudios <i>in vitro</i> se encontr&oacute; que   la prote&iacute;na c-Myc es inactiva cuando se encuentra   sola, no forma homod&iacute;meros, ni se une al ADN; por lo   tanto, requiere la dimerizaci&oacute;n con Max para unirse   al ADN &#40;27,39&#41;. En contraste, la prote&iacute;na Max forma   f&aacute;cilmente homod&iacute;meros y se une directamente al   ADN para inducir la transcripci&oacute;n.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Otro aspecto importante es que la prote&iacute;na Max puede   unirse a otras prote&iacute;nas como las de la familia Mad, para   inducir represi&oacute;n de la transcripci&oacute;n &#40;6,33&#41;. Los niveles   de la prote&iacute;na Mad, que son opuestos a los de c-Myc,   aumentan durante la diferenciaci&oacute;n celular, mientras   que una baja expresi&oacute;n de la prote&iacute;na Mad2 &#40;Mxi-1&#41;   se asocia con el desarrollo de tumores en modelos   murinos. El complejo Mad-Max, al contrario de Myc-Max,   interacciona con las histonas deacetilasas que inducen   estructuras compactas de la cromatina, lo cual limita el   acceso de los factores de transcripci&oacute;n al ADN &#40;33&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Finalmente, se presentan modificaciones postraduccionales   de la prote&iacute;na c-Myc, como glicosilaci&oacute;n y   fosforilaci&oacute;n, que alteran su vida media; por ejemplo,   la fosforilaci&oacute;n del dominio de transactivaci&oacute;n   transcripcional de c-Myc constituye un sustrato para   la acci&oacute;n de factores de crecimiento regulados por las   prote&iacute;nas MAP quinasas &#40;por la sigla en ingl&eacute;s de <i>mitogenactivated     protein kinases</i>&#41;, as&iacute; como para prote&iacute;nas   quinasas dependientes del ciclo celular. Este dominio   tiene gran importancia porque se lo considera un blanco   directo para la regulaci&oacute;n del ciclo celular y de diferentes   v&iacute;as de se&ntilde;alizaci&oacute;n &#40;<a href="img/revistas/iat/v24n4/v24n4a6f2.jpg" target="_blank">figura 2</a>&#41;. De otro lado, se ha   observado que la inhibici&oacute;n de la prote&iacute;na c-Myc podr&iacute;a   bloquear v&iacute;as de se&ntilde;alizaci&oacute;n mit&oacute;genas espec&iacute;ficas y de   esta manera facilitar la diferenciaci&oacute;n celular &#40;34,36,41&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Funci&oacute;n del c-Myc en la regulaci&oacute;n del ciclo celular</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El gen c-Myc participa junto con muchos otros genes   en la regulaci&oacute;n del ciclo celular. Sin embargo, no   se conoce bien su funci&oacute;n en la activaci&oacute;n de las   redes metab&oacute;licas citos&oacute;lica y mitocondrial durante   la entrada de la c&eacute;lula al ciclo celular &#40;42&#41;; c-Myc no   solamente promueve el paso de las c&eacute;lulas de G0 a   G1, sino que tambi&eacute;n durante toda la fase G1 del ciclo   celular induce la transcripci&oacute;n de genes e interviene   en el crecimiento y la proliferaci&oacute;n celulares y en la   apoptosis. Los estudios sugieren que c-Myc tiene la   capacidad de activar la maquinaria del ciclo celular   y se lo considera un gen ''maestro'' para la activaci&oacute;n   de muchos genes por diferentes v&iacute;as metab&oacute;licas.   Se sabe que este gen es clave para la activaci&oacute;n de   la gluc&oacute;lisis, mediante la regulaci&oacute;n de genes que   intervienen en ella con el fin de proporcionar energ&iacute;a   durante todo el ciclo celular &#40;21,43&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En c&eacute;lulas en reposo la prote&iacute;na c-Myc estimula el   inicio de la mitosis, lo que sugiere que es una prote&iacute;na   esencial para el crecimiento celular continuo; adem&aacute;s,   es necesaria para varias fases del ciclo celular. No solo   c-Myc es indispensable en el punto de transici&oacute;n G<sub>0</sub>/G1   de dicho ciclo, sino que tambi&eacute;n, como resultado de   su activaci&oacute;n, permite a las c&eacute;lulas salir de la fase G<sub>0</sub> y   continuar con la progresi&oacute;n del ciclo &#40;42,44-47&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Con respecto a las funciones del c-Myc en el ciclo   celular, varios estudios determinaron, mediante la   recombinaci&oacute;n hom&oacute;loga, que la inactivaci&oacute;n de   los dos alelos de este gen produce una prolongaci&oacute;n   significativa de la fase S &#40;28,47&#41;. Asi mismo, se demostr&oacute;   en c&eacute;lulas Myc-nulas, es decir, que no expresan L-Myc   ni N-Myc, una mayor prolongaci&oacute;n de las fases G<sub>1</sub> y   G<sub>2</sub>, mientras que la fase S transcurre en un tiempo   normal, por lo que se concluye que c-Myc es esencial   durante las fases G<sub>1</sub> y G<sub>2</sub> del ciclo celular.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por otra parte, est&aacute; bien definido que prote&iacute;nas como   las ciclinas, las quinasas dependientes de ciclinas   &#40;CDK, por la sigla en ingl&eacute;s de <i>cycline-dependent     kinases</i>&#41;, inhibidores de las CDK &#40;CKI, por la sigla en   ingl&eacute;s de <i>cycline kinases inhibitors</i>&#41; y otras prote&iacute;nas   reguladoras del ciclo celular son importantes para   el funcionamiento de c-Myc. Una de las v&iacute;as por las   cuales c-Myc participa en la progresi&oacute;n del ciclo   celular es la regulaci&oacute;n de los genes de las ciclinas;   por ejemplo, una expresi&oacute;n desregulada de c-Myc se   asocia con un aumento en la expresi&oacute;n de las ciclinas   A y E &#40;42, 44,45&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Adem&aacute;s, en cuanto a la regulaci&oacute;n de la fase G<sub>1</sub>, la   interacci&oacute;n entre c-Myc y ciclina D1 es compleja   y depende de diferentes est&iacute;mulos. Adem&aacute;s,   c-Myc aumenta la expresi&oacute;n de las CDK por varios   mecanismos, por ejemplo: coopera con la prote&iacute;na   RAS &#40;por la sigla en ingl&eacute;s de <i>RA-t sarcoma</i>&#41; para   inducir el promotor de CDC2 &#40;CDK1&#41;. Otra relaci&oacute;n   directa entre c-Myc y el ciclo celular es la capacidad   de activar directamente genes como cdc25A y el de la   ciclina E durante la progresi&oacute;n de dicho ciclo &#40;42,45&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">El gen cdc25A codifica para una prote&iacute;na fosfatasa que   a su vez activa a CDK2 y CDK4. Adem&aacute;s, la expresi&oacute;n   de c-Myc disminuye el nivel del inhibidor p27 durante   la regulaci&oacute;n del ciclo celular en el punto G1/S; sin   embargo, no se conoce con claridad el mecanismo   por el cual c-Myc interfiere con la actividad del p27   &#40;48&#41;.   </font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En la d&eacute;cada de los a&ntilde;os 90 Cleveland y colaboradores   encontraron en estudios con l&iacute;neas mieloides de   c&eacute;lulas progenitoras que la desregulaci&oacute;n del gen   c-Myc induce el mecanismo de apoptosis &#40;28,49&#41;;   estas c&eacute;lulas dependen de la interleucina-3 &#40;IL-3&#41;   para su crecimiento y para la expresi&oacute;n de c-Myc.   En ausencia de IL-3, la expresi&oacute;n anormal de c-Myc   conduce a las c&eacute;lulas hacia la fase S, para luego activar   por esta v&iacute;a la apoptosis y detener el ciclo celular;   adem&aacute;s, se observ&oacute; que c-Myc afecta la transcripci&oacute;n   de diferentes genes que intervienen en la apoptosis,   como es el caso de TP53.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>c-Myc en la oncog&eacute;nesis</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El proto-oncog&eacute;n c-Myc es uno de los genes m&aacute;s   com&uacute;nmente relacionados con el origen de una gran   variedad de neoplasias humanas &#40;14,34,44&#41;. La p&eacute;rdida   de regulaci&oacute;n de c-Myc juega un papel importante en el   origen del c&aacute;ncer. Estudios con animales transg&eacute;nicos   demostraron que la desregulaci&oacute;n de c-Myc es el   principal evento que podr&iacute;a explicar la carcinog&eacute;nesis   en la mayor&iacute;a de los tejidos &#40;16&#41;, adem&aacute;s de que   induce a la transformaci&oacute;n celular en modelos <i>in vitro</i> e <i>in vivo</i> &#40;44&#41;. De los anteriores hallazgos, tambi&eacute;n se   concluye que la sobrexpresi&oacute;n de c-Myc se encuentra   en m&aacute;s del 50&#37; de las neoplasias humanas y se asocia   con un mal pron&oacute;stico y un fenotipo invasor. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En el locus 8q24 del gen c-Myc ocurren con frecuencia   alteraciones cromos&oacute;micas que afectan su estructura   y funci&oacute;n &#40;18,22&#41;. Entre las alteraciones m&aacute;s comunes   de c-Myc que lo relacionan con la oncog&eacute;nesis est&aacute;   la translocaci&oacute;n rec&iacute;proca t&#40;8;14&#41; en individuos con   linfoma de Burkitt, una malignidad hematol&oacute;gica de   c&eacute;lulas B, caracterizada por ser muy agresiva y con   un alto grado de proliferaci&oacute;n &#40;19,20&#41;. En este tipo   de tumor c-Myc se transloca con uno de los genes de   la cadena pesada de las inmunoglobulinas &#40;IGH, por   la sigla en ingl&eacute;s de <i>immunoglobulin heavy chain</i>&#41;   localizado en el cromosoma 14 &#40;18,19,22,50&#41;. Estos   dos genes translocados se activan de una forma   anormal en las c&eacute;lulas afectadas, lo que conduce a una   expresi&oacute;n del gen c-Myc constitutiva y desregulada;   as&iacute; se alcanzan niveles altos de expresi&oacute;n del producto   del gen. Adem&aacute;s, el gen IGH potencia la desregulaci&oacute;n   de c-Myc. La t&#40;8;14&#41; se observa en cerca del 85&#37; de los   casos de linfoma de Burkitt &#40;50-52&#41;; sin embargo, dicha   translocaci&oacute;n no es exclusiva de este linfoma sino   que tambi&eacute;n se la ha encontrado en otras neoplasias   humanas, como es el caso de leucemias y del mieloma   m&uacute;ltiple &#40;19,53&#41;. Por otra parte, en otros estudios se   encontr&oacute; que en el linfoma de Burkitt tambi&eacute;n puede   ocurrir que el gen c-Myc se transloque con otros genes   de las inmunoglobulinas, generando translocaciones   cromos&oacute;micas variantes como la t&#40;2;8&#41; y la t&#40;8;22&#41;,   como resultado de los diferentes sitios de ruptura   cromos&oacute;mica &#40;18,54&#41;. De los anteriores hallazgos se   concluye que el gen c-Myc juega un papel importante   en la patog&eacute;nesis del linfoma de Burkitt &#40;19,55&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Finalmente, otras alteraciones frecuentes en el   locus 8q24 que afectan la expresi&oacute;n del gen c-Myc   son deleciones, aneuploid&iacute;as del cromosoma 8,   amplificaci&oacute;n, mutaciones puntuales e inserci&oacute;n viral   &#40;15,18,24,53&#41;; todas estas alteraciones se presentan en   diversas neoplasias como en los c&aacute;nceres de mama,   pulm&oacute;n, ovario, pr&oacute;stata, colon y est&oacute;mago, as&iacute; como   en leucemias y linfomas &#40;18,56-59&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Inestabilidad gen&eacute;tica en c&aacute;ncer inducida por c-Myc</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> El c&aacute;ncer es un proceso evolutivo en el que las   c&eacute;lulas normales adquieren un fenotipo maligno   a partir de la acumulaci&oacute;n de diversas alteraciones   gen&eacute;ticas y epigen&eacute;ticas que afectan a protooncogenes,   genes supresores de tumores y genes   de reparaci&oacute;n del ADN &#40;19,60-63&#41;. La inestabilidad   gen&eacute;tica &#40;IG&#41; es una caracter&iacute;stica propia de las c&eacute;lulas   tumorales; este fen&oacute;meno favorece la aparici&oacute;n de   aneuploid&iacute;as y, adem&aacute;s, genera un aumento en la tasa   de mutaciones &#40;64&#41;. En la IG se identifican dos tipos: la   inestabilidad microsatelital &#40;MSI, por la sigla en ingl&eacute;s   de <i>microsatellite instability</i>&#41;, tambi&eacute;n conocida como   MIN, en la que se presenta expansi&oacute;n o contracci&oacute;n del   n&uacute;mero de repeticiones de oligonucle&oacute;tidos presentes   en secuencias de microsat&eacute;lites de genes de reparaci&oacute;n,   como es el caso de los genes MLH1 y MSH2 en individuos   con c&aacute;ncer colorrectal hereditario sin poliposis &#40;63,64&#41;;   el otro tipo es la inestabilidad cromos&oacute;mica &#40;CIN, por   la sigla en ingl&eacute;s de <i>chromosomal instability</i>&#41;, que se   refiere a las alteraciones cromos&oacute;micas num&eacute;ricas   y estructurales presentes en las c&eacute;lulas neopl&aacute;sicas   &#40;63,65-67&#41;. Se considera que cerca del 50&#37; de los   tumores s&oacute;lidos tienen alteraciones cromos&oacute;micas.   Los dos tipos de inestabilidad se presentan en una   amplia variedad de neoplasias. Cabe mencionar que   entre los tipos de IG en el c&aacute;ncer tambi&eacute;n se propone   la inestabilidad telom&eacute;rica, que a su vez promueve   la inestabilidad cromos&oacute;mica &#40;63,65,68&#41;; este tipo de   inestabilidad afecta la integridad del tel&oacute;mero y se la   ha observado en varias neoplasias &#40;66&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La relaci&oacute;n del gen c-Myc con la IG en las c&eacute;lulas   tumorales se podr&iacute;a explicar por sus funciones en la   proliferaci&oacute;n y regulaci&oacute;n del ciclo celular, pero m&aacute;s   espec&iacute;ficamente por la inducci&oacute;n de especies reactivas   de ox&iacute;geno y la promoci&oacute;n de CIN, especialmente   aneuploid&iacute;as y tetraploid&iacute;as &#40;64,68&#41;. Por consiguiente,   la desregulaci&oacute;n de c-Myc afecta su interacci&oacute;n con   otros genes responsables de la integridad del genoma,   como son los genes supresores de tumores y los de la   reparaci&oacute;n del ADN, lo que ocasiona que se alteren   diversos mecanismos celulares y gen&eacute;ticos; de esta   forma se induce la aparici&oacute;n de un fenotipo mutador en   las c&eacute;lulas neopl&aacute;sicas. De lo anterior se concluye que el   gen c-Myc act&uacute;a como un gen ''maestro'' que coordina   la expresi&oacute;n de m&uacute;ltiples genes &#40;1,18,42,64&#41;. Adem&aacute;s,   c-Myc tambi&eacute;n contribuye a la oncog&eacute;nesis mediante   la inducci&oacute;n de la IG por alteraciones espec&iacute;ficas en   el punto de control G1/S del ciclo celular, en el cual se   presenta la respuesta al da&ntilde;o del ADN; en consecuencia,   se acumulan diversos tipos de da&ntilde;os en la c&eacute;lula &#40;42,64&#41;. </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"><b>Amplificaci&oacute;n del gen c-Myc en la oncog&eacute;nesis</b> </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La amplificaci&oacute;n es una de las alteraciones m&aacute;s   comunes del oncog&eacute;n c-Myc en diversas neoplasias humanas &#40;30,69,70&#41;. Muchos estudios demuestran que   la amplificaci&oacute;n y la sobrexpresi&oacute;n del oncog&eacute;n c-Myc   son claves en la iniciaci&oacute;n y progresi&oacute;n del c&aacute;ncer, tal   como se informa en leucemias, linfomas y tumores   s&oacute;lidos. Adem&aacute;s, la amplificaci&oacute;n se relaciona con   la sobrexpresi&oacute;n de oncogenes, produciendo una   ventaja selectiva y mayor tasa de proliferaci&oacute;n a   las c&eacute;lulas transformadas &#40;60-62&#41;. El oncog&eacute;n c-Myc   se encuentra expresado en altos niveles en diversas   neoplasias como las de mama, pr&oacute;stata, pulm&oacute;n,   colon y linfomas, y en la mayor&iacute;a se asocia con mal   pron&oacute;stico de la enfermedad &#40;14,71,72&#41;; por ejemplo,   las frecuencias de amplificaci&oacute;n y sobrexpresi&oacute;n de   c-Myc en el c&aacute;ncer de mama var&iacute;an ampliamente   entre 1&#37; y 94&#37; y de 22&#37; a 95&#37;, respectivamente   &#40;60,61,73-76&#41;.</font></p>     ]]></body>
<body><![CDATA[<p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En otro estudio en el que se analizaron cerca de   1.000 casos de c&aacute;ncer de mama se encontr&oacute; que   la amplificaci&oacute;n de c-Myc fue del 17&#37;; adem&aacute;s se   hall&oacute; que esta alteraci&oacute;n se correlaciona con un mal   pron&oacute;stico de la enfermedad &#40;77,78&#41;. La amplificaci&oacute;n   de c-Myc tambi&eacute;n se ha observado en un 29&#37; de los   casos de c&aacute;ncer de pr&oacute;stata y en un 40&#37; de los de   c&aacute;ncer g&aacute;strico &#40;57,58&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">La amplificaci&oacute;n es una alteraci&oacute;n gen&eacute;tica que   conduce al aumento en el n&uacute;mero de copias de un   gen o de grupos de genes contiguos, lo que ocasiona   una expresi&oacute;n g&eacute;nica anormal &#40;18,62&#41;. Entre las causas   cromos&oacute;micas que originan la amplificaci&oacute;n del   oncog&eacute;n c-Myc est&aacute;n las translocaciones, trisom&iacute;as,   duplicaciones e isocromosomas que involucren el   locus 8q24 &#40;51,68&#41;. Asimismo, dichas alteraciones   afectan las v&iacute;as de regulaci&oacute;n de c-Myc sobre otros   genes, tales como TP53 y RB, por lo que se propone   que la amplificaci&oacute;n de este gen se asocia con la   inestabilidad gen&oacute;mica, la cual a su vez promueve la   oncog&eacute;nesis &#40;14,66,78&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Un tipo de amplificaci&oacute;n son los cromosomas dobles   diminutos &#40;DM&#41; <i>&#40;double minutes&#41;</i>, que son peque&ntilde;os   fragmentos extracromos&oacute;micos que contienen genes   amplificados, est&aacute;n presentes en m&uacute;ltiples copias y   son frecuentes en diversos tumores s&oacute;lidos y linfomas   &#40;17-19,53&#41;; los cromosomas DM generalmente se   detectan con t&eacute;cnicas de citogen&eacute;tica convencional o   molecular &#40;FISH, por la sigla en ingl&eacute;s de <i>fluorescent in     situ hybridization</i>&#41;. Otro tipo de amplificaci&oacute;n son las   denominadas regiones homog&eacute;neamente coloreadas   &#40;HSR, por la sigla en ingl&eacute;s de <i>homogeneous staining     regions</i>&#41; presentes en determinadas regiones   cromos&oacute;micas, como en la del locus 8q24 del gen   c-Myc; las HSR son un producto del conjunto de   genes amplificados; estas regiones contienen varios   cientos de genes amplificados y tienen un patr&oacute;n de   bandeo cromos&oacute;mico anormal &#40;17&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Estos dos tipos de amplificaci&oacute;n son comunes durante   el desarrollo y la progresi&oacute;n del c&aacute;ncer y afectan por   lo general el n&uacute;mero de copias de proto-oncogenes,   las cuales alteran la tasa de proliferaci&oacute;n celular, lo   que promueve la inestabilidad gen&oacute;mica y, a su vez, el   proceso de carcinog&eacute;nesis en diversas neoplasias &#40;18,64&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Se puede detectar la amplificaci&oacute;n de oncogenes en   muestras de tumores humanos con las t&eacute;cnicas de   hibridaci&oacute;n <i>in situ</i> fluorescente &#40;FISH&#41; e hibridaci&oacute;n   gen&oacute;mica comparativa &#40;CGH, por la sigla en ingl&eacute;s de <i>comparative genomic hybridization</i>&#41;, que son muy   espec&iacute;ficas y sensibles para ese prop&oacute;sito &#40;53,60,79&#41;.</font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> En numerosos estudios con estas t&eacute;cnicas han hallado   niveles altos de amplificaci&oacute;n de muchos genes en   c&eacute;lulas neopl&aacute;sicas, especialmente con los genes   c-Myc y HER-2 en tumores primarios de mama.   Se considera que la co-amplificaci&oacute;n de estos dos   genes se relaciona con la presencia de otros tipos de   alteraciones gen&eacute;ticas, al igual que con tumores m&aacute;s   agresivos y del mal pron&oacute;stico &#40;60,62,80&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Por lo anterior, la amplificaci&oacute;n de los genes c-Myc   y HER-2 en el c&aacute;ncer de mama se considera como   un marcador molecular recurrente con valor   pron&oacute;stico para las pacientes &#40;60,62,81,82&#41;. Adem&aacute;s,   los hallazgos sugieren que la amplificaci&oacute;n de c-Myc   podr&iacute;a ocurrir en las etapas iniciales del desarrollo   del c&aacute;ncer de mama y simult&aacute;neamente presentarse   mutaciones en el gen TP53. Estos conocimientos   son de gran importancia para la biolog&iacute;a del c&aacute;ncer,   porque han permitido el desarrollo de nuevas drogas   antineopl&aacute;sicas que inhiban la amplificaci&oacute;n g&eacute;nica   en determinadas neoplasias; el caso m&aacute;s conocido y de   gran utilidad en oncolog&iacute;a ha sido el del trastuzumab   &#40;Herceptin<sup>&#174;</sup>&#41;, una droga dise&ntilde;ada para bloquear la   amplificaci&oacute;n del gen ERBB2 durante el tratamiento   del c&aacute;ncer de mama; el estudio de la amplificaci&oacute;n   de este gen es importante porque se considera un   marcador de recurrencia de la enfermedad &#40;62,80,83&#41;.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">En un estudio hecho por el Grupo de Gen&eacute;tica M&eacute;dica,   evaluando la amplificaci&oacute;n del gen c-Myc en muestras   de c&aacute;ncer de mama incluidas en bloques de parafina   con la t&eacute;cnica FISH &#40;datos sin publicar&#41;, se encontr&oacute; una alta frecuencia de aneuploid&iacute;a del cromosoma 8 y de amplificaci&oacute;n del gen c-Myc, corroborando lo informado en la literatura que ambas alteraciones son   comunes en este tipo de c&aacute;ncer &#40;<a href="img/revistas/iat/v24n4/v24n4a6f3.jpg" target="_blank">figura 3</a>&#41;. En los estudios   con FISH es posible detectar la heterogeneidad gen&eacute;tica intratumoral que se presenta durante el desarrollo del c&aacute;ncer, lo que es una ventaja de la t&eacute;cnica FISH con respecto a otras t&eacute;cnicas moleculares.   </font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif">Finalmente, la caracterizaci&oacute;n molecular de las alteraciones del gen c-Myc contin&uacute;a siendo un tema   de gran inter&eacute;s en la gen&eacute;tica del c&aacute;ncer, debido a la asociaci&oacute;n de estas alteraciones con la g&eacute;nesis de muchas   neoplasias en humanos; los nuevos conocimientos   aportar&aacute;n informaci&oacute;n valiosa para desarrollar nuevas estrategias terap&eacute;uticas con el fin de controlar eficazmente la expresi&oacute;n del gen c-Myc en el desarrollo del c&aacute;ncer. </font></p>     <p>&nbsp;</p>     ]]></body>
<body><![CDATA[<p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"><b>AGRADECIMIENTOS</b></font></p>     <p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> Este art&iacute;culo es producto del proyecto de investigaci&oacute;n CPT-0416, financiado por la Universidad de Antioquia.</font></p>     <p>&nbsp;</p>     <p><font size="3" face="Verdana, Arial, Helvetica, sans-serif"> <b>REFERENCIAS BIBLIOGR&Aacute;FICAS</b></font></p>     <!-- ref --><p><font size="2" face="Verdana, Arial, Helvetica, sans-serif"> 1. Eilers M, Eisenman RN. Myc's broad reach. 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