<?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>0535-5133</journal-id>
<journal-title><![CDATA[Investigación Clínica]]></journal-title>
<abbrev-journal-title><![CDATA[Invest. clín]]></abbrev-journal-title>
<issn>0535-5133</issn>
<publisher>
<publisher-name><![CDATA[Instituto de Investigaciones Clínicas "Dr. Américo Negrette", Facultad de Medicina, Universidad del Zulia]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S0535-51332014000200004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[Ausencia de asociación entre la variante S447X del gen de la lipoproteína lipasa y lípidos plasmáticos: Estudio preliminar]]></article-title>
<article-title xml:lang="en"><![CDATA[Lack of association between the S447X variant of the lipoprotein lipase gene and plasma lipids: A preliminary study]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Zambrano Morales]]></surname>
<given-names><![CDATA[Mariana]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Fernández Salgado]]></surname>
<given-names><![CDATA[Erika]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Balzán Urdaneta]]></surname>
<given-names><![CDATA[Ligia]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Labastidas]]></surname>
<given-names><![CDATA[Neila]]></given-names>
</name>
<xref ref-type="aff" rid="A03"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Aranguren-Méndez]]></surname>
<given-names><![CDATA[José]]></given-names>
</name>
<xref ref-type="aff" rid="A04"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Connell]]></surname>
<given-names><![CDATA[Lissette]]></given-names>
</name>
<xref ref-type="aff" rid="A02"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Molero Paredes]]></surname>
<given-names><![CDATA[Tania]]></given-names>
</name>
<xref ref-type="aff" rid="A01"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Rojas]]></surname>
<given-names><![CDATA[Alicia]]></given-names>
</name>
<xref ref-type="aff" rid="A05"/>
</contrib>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Panunzio]]></surname>
<given-names><![CDATA[Amelia]]></given-names>
</name>
<xref ref-type="aff" rid="A06"/>
</contrib>
</contrib-group>
<aff id="A01">
<institution><![CDATA[,Universidad del Zulia Facultad de Medicina Escuela de Bioanálisis]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A02">
<institution><![CDATA[,Universidad del Zulia Facultad de Medicina Instituto de Investigaciones Clínicas Dr. Américo Negrette]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A03">
<institution><![CDATA[,Hospital General del Sur Dr. Pedro Iturbe  ]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A04">
<institution><![CDATA[,Universidad del Zulia Facultad de Veterinaria Cátedra de Genética]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A05">
<institution><![CDATA[,Universidad del Zulia Facultad de Medicina Instituto de Investigaciones Genéticas]]></institution>
<addr-line><![CDATA[ ]]></addr-line>
</aff>
<aff id="A06">
<institution><![CDATA[,Universidad del Zulia Facultad de Medicina Escuela de Bioanálisis]]></institution>
<addr-line><![CDATA[Maracaibo ]]></addr-line>
<country>Venezuela</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2014</year>
</pub-date>
<volume>55</volume>
<numero>2</numero>
<fpage>133</fpage>
<lpage>141</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_arttext&amp;pid=S0535-51332014000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_abstract&amp;pid=S0535-51332014000200004&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://ve.scielo.org/scielo.php?script=sci_pdf&amp;pid=S0535-51332014000200004&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[El aumento en los valores de los lípidos sanguíneos, constituye un importante factor de riesgo cardiovascular. La lipoproteína lipasa (LPL) juega un papel importante en el metabolismo lipoproteico. Factores metabólicos y genéticos pueden influir en la función de la LPL. La variante S447X de la LPL se ha asociado con cambios en el perfil lipídico en diferentes poblaciones. El objetivo de esta investigación fue analizar la relación entre la variante S447X del gen de la LPL y lípidos plasmáticos de individuos del Estado Zulia, Venezuela. Se estudiaron 75 individuos entre 20 y 60 años, 34 hombres y 41 mujeres. A cada individuo se le realizó una historia clínica con antecedentes familiares, características antropométricas, estado nutricional y pruebas bioquímicas. Para el estudio molecular, se extrajo el ADN genómico, se utilizó la reacción en cadena de la polimerasa (RCP) seguida de digestión enzimática para polimorfismos de longitud de fragmentos de restricción utilizando la enzima Hinf I. Los individuos estudiados presentaron niveles normales de glicemia, triglicéridos, colesterol total, lipoproteínas de baja densidad (C-LDL) y niveles ligeramente disminuidos de las lipoproteínas de alta densidad (C-HDL). La distribución genotípica dela variante S447X del gen LPL fue 90,6% para el genotipo homocigoto 447SS y 9,4% para el genotipo heterocigoto 447SX; no se identificó el genotipo 447XX. La población se ajustó al equilibrio genético de Hardy Weinberg. No se encontró relación entre el polimorfismo S447X del gen LPL y los valores lipídicos plasmáticos.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[The increase in lipid plasma values is an important cardiovascular risk factor. Lipoprotein lipase (LPL) plays an important role in the lipoprotein metabolism and metabolic and genetic factors may influence its levels and functions. The S447X variant of the lipoprotein lipase gene is associated with changes in plasma lipids in different populations. The objective of this research was to analyze the S447X variant of the LPL gene and its relation with plasma lipids of individuals in Zulia state, Venezuela. With this purpose, we studied 75 individuals (34 men and 41 women) between 20 and 60 years of age. Each subject had a medical history which included family history, anthropometric characteristics, nutritional status evaluation and biochemical tests. Genomic DNA was extracted for the molecular study and the polymerase chain reaction was used, followed by enzyme digestion, for restriction fragments length polymorphisms using the Hinf I enzyme. The individuals studied had normal levels of blood glucose, triglycerides, total cholesterol and low density lipoproteins (LDL-C) and slightly decreased levels of high density lipoproteins (HDL-C). The genotypic distribution of the LPL gene S447X variant in the studied population was 90.6% for the homozygous genotype SS447 and 9.4% for the heterozygote SX447. The genotype 447XX was not identified. The population was found in Hardy Weinberg genetic equilibrium. No association between the S447X polymorphism of lipoprotein lipase gene and plasma lipids was observed.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[lipoproteína lipasa]]></kwd>
<kwd lng="es"><![CDATA[gen]]></kwd>
<kwd lng="es"><![CDATA[polimorfismo S447X]]></kwd>
<kwd lng="es"><![CDATA[lípidos plasmáticos]]></kwd>
<kwd lng="en"><![CDATA[lipoproteinlipase]]></kwd>
<kwd lng="en"><![CDATA[gene]]></kwd>
<kwd lng="en"><![CDATA[S447X polymorphism]]></kwd>
<kwd lng="en"><![CDATA[plasma lipids]]></kwd>
</kwd-group>
</article-meta>
</front><body><![CDATA[  <BASEFONT SIZE="3"> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="center"><FONT COLOR="#1f1a17" FACE="Verdana"> <B>Ausencia de asociaci&#243;n entre la variante S447X del gen de la lipoprote&#237;na  lipasa  y l&#237;pidos plasm&#225;ticos. Estudio preliminar.</B></FONT></P>     <P ALIGN="center"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Mariana Zambrano Morales<SUP>1</SUP>, Erika Fern&#225;ndez Salgado<SUP>2</SUP>, Ligia Balz&#225;n Urdaneta<SUP>2</SUP>,&nbsp; Neila Labastidas<SUP>3</SUP>, Jos&#233; Aranguren-M&#233;ndez<SUP>4</SUP>, Lissette Connell<SUP>2</SUP>, Tania Molero  Paredes<SUP>1</SUP>, Alicia Rojas<SUP>5</SUP> y Amelia Panunzio<SUP>6</SUP>.</FONT></P>     <P ALIGN="justify"> <FONT COLOR="#1f1a17" FACE="Verdana" SIZE="2"><SUP>1</SUP>C&#225;tedra de Bioqu&#237;mica Cl&#237;nica, Escuela de Bioan&#225;lisis, <SUP>2</SUP>Instituto de Investigaciones  Cl&#237;nicas Dr. Am&#233;rico Negrette, Facultad de Medicina, Universidad del Zulia. <SUP>3</SUP>Hospital  General del Sur &#147;Dr. Pedro Iturbe&#148;. <SUP>4</SUP>C&#225;tedra de Gen&#233;tica, Facultad de Veterinaria, <SUP>5</SUP>Instituto  de Investigaciones Gen&#233;ticas, Facultad de Medicina, <SUP>6</SUP>Departamento de Salud  P&#250;blica y Social, Escuela de Bioan&#225;lisis, Facultad de Medicina, Universidad  del Zulia. Maracaibo, Venezuela.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Autor de correspondencia: Mariana Zambrano-Morales. C&#225;tedra de Bioqu&#237;mica,  Escuela de Bioan&#225;lisis, Facultad de Medicina, Universidad del Zulia. Maracaibo,  Venezuela. Correo electr&#243;nico: </FONT> <FONT COLOR="#0000ff" FACE="Verdana" SIZE="2"><U><A HREF="mailto:marines2122@yahoo.com">marines2122@yahoo.com</A></U></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Resumen.</B> El aumento en los valores de los l&#237;pidos sangu&#237;neos, constituye  un importante factor de riesgo cardiovascular. La lipoprote&#237;na lipasa (LPL)  juega un papel importante en el metabolismo lipoproteico. Factores metab&#243;licos  y gen&#233;ticos pueden influir en la funci&#243;n de la LPL. La variante S447X de  la LPL se ha asociado con cambios en el perfil lip&#237;dico en diferentes poblaciones.  El objetivo de esta investigaci&#243;n fue analizar la relaci&#243;n entre la variante  S447X del gen de la LPL y l&#237;pidos plasm&#225;ticos de individuos del Estado  Zulia, Venezuela. Se estudiaron 75 individuos entre 20 y 60 a&#241;os, 34 hombres  y 41 mujeres. A cada individuo se le realiz&#243; una historia cl&#237;nica con antecedentes  familiares, caracter&#237;sticas antropom&#233;tricas, estado nutricional y pruebas  bioqu&#237;micas. Para el estudio molecular, se extrajo el ADN gen&#243;mico, se  utiliz&#243; la reacci&#243;n en cadena de la polimerasa (RCP) seguida de digesti&#243;n  enzim&#225;tica para polimorfismos de longitud de fragmentos de restricci&#243;n  utilizando la enzima Hinf I. Los individuos estudiados presentaron niveles  normales de glicemia, triglic&#233;ridos, colesterol total, lipoprote&#237;nas de  baja densidad (C-LDL) y niveles ligeramente disminuidos de las lipoprote&#237;nas  de alta densidad (C-HDL). La distribuci&#243;n genot&#237;pica dela variante S447X  del gen LPL fue 90,6% para el genotipo homocigoto 447SS y 9,4% para el  genotipo heterocigoto 447SX; no se identific&#243; el genotipo 447XX. La poblaci&#243;n  se ajust&#243; al equilibrio gen&#233;tico de Hardy Weinberg. No se encontr&#243; relaci&#243;n  entre el polimorfismo S447X del gen LPL y los valores lip&#237;dicos plasm&#225;ticos.</FONT></P> </MULTICOL>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Palabras clave:&nbsp;</B>lipoprote&#237;na lipasa, gen, polimorfismo S447X, l&#237;pidos plasm&#225;ticos.</FONT></P> <MULTICOL GUTTER="31" COLS="2"> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="center"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Lack of association between the S447X variant of the lipoprotein lipase  gene and plasma lipids. A preliminary study.</B></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Abstract.</B> The increase in lipid plasma values is an important cardiovascular  risk factor. Lipoprotein lipase (LPL) plays an important role in the lipoprotein  metabolism and metabolic and genetic factors may influence its levels and  functions. The S447X variant of the lipoprotein lipase gene is associated  with changes in plasma lipids in different populations. The objective of  this research was to analyze the S447X variant of the LPL gene and its  relation with plasma lipids of individuals in Zulia state, Venezuela. With  this purpose, we studied 75 individuals (34 men and 41 women) between 20  and 60 years of age. Each subject had a medical history which included  family history, anthropometric characteristics, nutritional status evaluation  and biochemical tests. Genomic DNA was extracted for the molecular study  and the polymerase chain reaction was used, followed by enzyme digestion,  for restriction fragments length polymorphisms using the Hinf I enzyme.  The individuals studied had normal levels of blood glucose, triglycerides,  total cholesterol and low density lipoproteins (LDL-C) and slightly decreased  levels of high density lipoproteins (HDL-C). The genotypic distribution  of the LPL gene S447X variant in the studied population was 90.6% for the  homozygous genotype SS447 and 9.4% for the heterozygote SX447. The genotype  447XX was not identified. The population was found in Hardy Weinberg genetic  equilibrium. No association between the S447X polymorphism of lipoprotein  lipase gene and plasma lipids was observed.</FONT></P> </MULTICOL>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>Key words:&nbsp;</B>lipoproteinlipase, gene, S447X polymorphism, plasma lipids.</FONT></P> <MULTICOL GUTTER="31" COLS="2">     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Recibido: 03-07-2013. Aceptado: 20-03-2014</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>INTRODUCCI&#211;N</B></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Las alteraciones en los l&#237;pidos plasm&#225;ticos constituyen factores de riesgo  modificables que conducen a la aparici&#243;n de las enfermedades cardiovasculares  (1, 2). Las enfermedades cardiovasculares representan un problema de salud  p&#250;blica a nivel mundial, causando 30% de todas las muertes en el mundo,  reduciendo 10% los a&#241;os de vida saludable (3). En Venezuela las enfermedades  cardiovasculares ocupan el primer lugar de las 25 principales causas de  muerte en ambos sexos, y entre individuos de 65 a 74 a&#241;os representan el  30% de las muertes (4).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> En los &#250;ltimos a&#241;os se ha estudiado la contribuci&#243;n de la variabilidad  gen&#233;tica de los factores de riesgo cardiovasculares, enfoc&#225;ndose el an&#225;lisis  en el estudio de genes candidatos involucrados en las v&#237;as biol&#243;gicas asociadas  con el metabolismo de los l&#237;pidos y la hemostasia (1, 5, 6). Dentro de  estos genes destacan, el gen de la Apo E, Apo B, y el gen de la lipoprote&#237;na  lipasa (LPL) (1, 5-16).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La LPL es una enzima que participa en el metabolismo y transporte de las  lipoprote&#237;nas, a trav&#233;s de la hidr&#243;lisis de los triglic&#233;ridos presentes  en los quilomicrones y las lipoprote&#237;nas de muy baja densidad (C-VLDL),  generando &#225;cidos grasos libres y glicerol utilizado para el almacenamiento  energ&#233;tico (1,8-16). La disminuci&#243;n de la actividad de la LPL influye en  los niveles lip&#237;dicos, causando hipertrigliceridemia e hipercolesterolemia  generalmente acompa&#241;ada de bajos niveles de C-HDL (9-13). El gen de la  LPL est&#225; localizado en 8p22, tiene una longitud de aproximadamente 30 kilobases  (Kb), contiene 10 exones y codifica una prote&#237;na de 475 amino&#225;cidos, incluyendo  un p&#233;ptido se&#241;al de 27 amino&#225;cidos (5-16).</FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Una variante del gen de la LPL ampliamente estudiada es el polimorfismo  S447X, que se produce por la sustituci&#243;n de citosina por guanina en la  posici&#243;n 1595 del ex&#243;n 9 del gen. Este cambio convierte el cod&#243;n que codifica  para la serina 447 en un cod&#243;n de terminaci&#243;n prematuro, originando un  incremento en la actividad de la enzima en los portadores de la variante  S447X (17).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Soland y col. (7) reportaron menor frecuencia del alelo 447X en individuos  hipertriglicerid&#233;micos y en individuos que han sufrido infarto agudo de  miocardio. Adem&#225;s, la variante 447X se asocia con mayor actividad post  heparina de la LPL, niveles disminuidos de colesterol total y triglic&#233;ridos  plasm&#225;ticos, as&#237; como valores aumentados del C-HDL (7). Este efecto protector  se atribuye a su mayor afinidad por los receptores, que facilita la eliminaci&#243;n  de las part&#237;culas remanentes del C-VLDL (7-16).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Por otro lado, Fern&#225;ndez y col. han reportado que la poblaci&#243;n Zuliana  presenta alto riesgo para desarrollar diabetes y enfermedades cardiovasculares  por presentar alteraciones metab&#243;licas como hipertrigliceridemia y disminuci&#243;n  del C-HDL (18).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> En consideraci&#243;n de lo anteriormente expuesto se plante&#243; como objetivo  establecer la relaci&#243;n de la variante S447X del gen de la LPL y los l&#237;pidos  plasm&#225;ticos.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>PACIENTES Y M&#201;TODOS</B></FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Se evaluaron 75 individuos no consangu&#237;neos en edades comprendidas entre  20 y 60 a&#241;os, nacidos en el Estado Zulia. Los criterios de exclusi&#243;n fueron:  el embarazo, la dislipidemia asociada a enfermedades del ri&#241;&#243;n, el h&#237;gado  y la tiroides, diabetes mellitus y el tratamiento con corticoesteroides,  estr&#243;genos, retinoides y los bloqueadores </FONT> <FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol"> b</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">-adren&#233;rgicos, enfermedad cr&#243;nica,  as&#237; como alguna medicaci&#243;n que alterara el metabolismo de la glucosa o  de los l&#237;pidos. Todos los participantes en el estudio firmaron su consentimiento  a participar luego de explicarles la naturaleza del mismo. El protocolo  de esta investigaci&#243;n fue aprobado por el Comit&#233; de &#201;tica del Instituto  de Investigaciones Cl&#237;nica &#147;Dr. Am&#233;rico Negrette&#148;, Maracaibo, Venezuela.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> A cada sujeto en estudio se le realiz&#243; una historia cl&#237;nica. Se determinaron  las caracter&#237;sticas antropom&#233;tricas: peso (kg) y talla (cm). Se calcul&#243;  el &#237;ndice de masa corporal (IMC) empleando la f&#243;rmula de Quetelet (kg/m<SUP>2</SUP>).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Se practicaron las pruebas bioqu&#237;micas con el cumplimiento del control  de calidad pre-anal&#237;tico, con 10 a 12 horas de ayuno. Se extrajo la muestra  de sangre venosa y se centrifug&#243; a 3000 rpm por 15 min para la obtenci&#243;n  del suero. Se determinaron los niveles s&#233;ricos de glicemia por el m&#233;todo  de glucosa oxidasa; colesterol total, triglic&#233;ridos, C-HDL por m&#233;todos  enzim&#225;ticos (Human), y la insulina por la t&#233;cnica ELISA (DRG). Se calcul&#243;  el C-LDL empleando la f&#243;rmula de Friedewald (19). Se calcul&#243; el modelo  de determinaci&#243;n de la homeostasis (HOMA-IR) empleando la f&#243;rmula desarrollada  por Matthews y col. (20, 21).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Para el an&#225;lisis molecular se aisl&#243; el ADN gen&#243;mico a partir de leucocitos  de sangre perif&#233;rica por la t&#233;cnica combinada derivada del m&#233;todo fenol-sevag  (22) e inorg&#225;nico (23). Se emple&#243; la t&#233;cnica de RCP como se describe a  continuaci&#243;n: a partir de 100 ng de ADN se adicion&#243; 20 &#181;L de mezcla de  reacci&#243;n constituida por 2,5 &#181;L de Buffer Taq (10X), 1 &#181;L de cada iniciador  (10&#181;M) 5&#146;- TGACCCACTTGCCACCCGTGC - 3&#146; y 5&#146; GCAGCAGCCAGGGCTGGC - 3&#146;(12),  0,5&#181;L de desoxinucle&#243;tido (10&#181;M), 1,5 &#181;L de cloruro de magnesio (25mM),  0,5 &#181;L de Taq polimerasa (5 U/&#181;L) y 13 &#181;L de agua ultra pura. Estos cebadores  delimitan el ex&#243;n 9 del gen de la LPL que contiene el polimorfismo S447X,  consistente en sustituci&#243;n de una citosina por una guanina, que produce  un cod&#243;n de terminaci&#243;n prematuro. Se utiliz&#243; un termociclador Perkin Elmer  modelo Gene Amp PCR system. La RCP se realiz&#243; con el siguiente programa:  desnaturalizaci&#243;n corta de 94&#176;C por 30 seg, alineamiento de los iniciadores  a 56&#176;C, extensi&#243;n de 72&#176;C por 2 min en un total de 40 ciclos. El programa  fue precedido por una desnaturalizaci&#243;n prolongada a 94&#176;C por 8 min y una  extensi&#243;n final de 72&#176;C por 10 min. El tama&#241;o del fragmento obtenido correspondi&#243;  a 160 pares de base (pb).</FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> El producto amplificado se someti&#243; a digesti&#243;n enzim&#225;tica con la enzima  de restricci&#243;n Hinf I (7), separ&#225;ndose posteriormente por electroforesis  horizontal en gel de agarosa al 2% en buffer Tris-EDTA-borato 1x. Se utiliz&#243;  como marcador de peso molecular Phi174 digerido con Hae III. El gel se  colore&#243; con una soluci&#243;n de 5mg/mL de bromuro de etidio y se visualiz&#243;  en un transiluminador con luz ultravioleta (HoeferMod. UVTM-25).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Se asign&#243; el genotipo homocigoto S447S (160 pb/160 pb) cuando en ambos  cromosomas no hubo corte con la enzima de restricci&#243;n, genotipo X447X (137+  23pb/137+ 23pb) cuando en ambos cromosomas se evidenci&#243; corte con la enzima,  el genotipo S447X (160pb/ 137+23 pb) fue asignado cuando en un cromosoma  se observ&#243; corte y en el otro ausencia de corte con la enzima utilizada  (<a href="#fig1">Fig. 1</a>).</FONT></P>     <P ALIGN="center"><a name="fig1"> <img border="0" src="/img/fbpe/ic/v55n2/art04fig1.gif" width="572" height="377"></a></P>     
<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>An&#225;lisis estad&#237;stico</B></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Con base a las frecuencias genot&#237;picas se estimaron las frecuencias al&#233;licas,  y se determin&#243; el ajuste al equilibrio gen&#233;tico de Hardy Weinberg utilizando  el estad&#237;stico Ji cuadrado. Para evaluar la relaci&#243;n entre el polimorfismo  S447X del gen de la LPL y las caracter&#237;sticas fenot&#237;picas expresadas en  promedios m&#225;s o menos desviaciones est&#225;ndar, se emple&#243; el an&#225;lisis de la  varianza (ANOVA). Se calcul&#243; el estad&#237;stico Odds ratio (OR) para determinar  la asociaci&#243;n de los genotipos del polimorfismo con el perfil lip&#237;dico.  Todos los an&#225;lisis fueron realizados utilizando el paquete estad&#237;stico  SAS (Statistical Analysis System), versi&#243;n 9,0 del SAS Institute, NC, USA.  El valor de p&lt;0,05 fue usado para determinar diferencias estad&#237;sticas significativas.</FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>RESULTADOS</B></FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Los resultados de las caracter&#237;sticas antropom&#233;tricas y pruebas bioqu&#237;micas  se muestran en la <a href="#TABLA_I">Tabla I</a>.</FONT></P> </MULTICOL>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B><a name="TABLA_I">TABLA I</a></B></FONT></P>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> DISTRIBUCI&#211;N DE LAS CARACTER&#205;STICAS ANTROPOM&#201;TRICAS Y PRUEBAS BIOQU&#205;MICAS</FONT></P>     <div align="center"> <TABLE width="452" border="1" id="table1"> <TR> <TD WIDTH="212" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Caracter&#237;sticas fenot&#237;picas&nbsp; </FONT></P> </TD> <TD VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Poblaci&#243;n total estudiada&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Sexo M/F&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 34/41&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Edad (a&#241;os)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 36,9 &#177; 11,11&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Peso (kg)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 85,30 &#177; 22,07&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Talla (m)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 1,64 &#177; 0,10&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> IMC (kg/m<SUP>2</SUP>)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 31,46 &#177; 7,03&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Glicemia basal (mg/dL)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 76,13 &#177; 9,86&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Insulina (&#181;U/mL)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 13,81 &#177; 10,45&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Homa-IR&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 2,69 &#177; 2,53&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Triglic&#233;ridos&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 114,89 &#177; 67,30&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Colesterol (mg/dL)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 151,29 &#177; 32,55&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C-HDL (mg/dL) M&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 33,42 &#177; 1,49&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C-HDL (mg/dL) F&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 43,57 &#177; 1,39&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="212" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C-LDL (mg/dL)&nbsp; </FONT></P> </TD> <TD VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 89,93 &#177; 23,69&nbsp; </FONT></P> </TD> </TR> </TABLE> </div>     <P ALIGN="justify" style="margin-left: 20px"> <FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana">Los valores se expresan en medias &#177; error est&#225;ndar, M/F= masculino/femenino</FONT></P> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La distribuci&#243;n genot&#237;pica del polimorfismo S447X del gen de la LPL en  los individuos estudiados fue 90,6% para el genotipo homocigoto S447S y  9,4% para el genotipo heterocigoto S447X; ning&#250;n individuo present&#243; el  genotipo X447X. Las frecuencias de los alelos S447 y 447X fueron 0,95 y  0,05 respectivamente. La poblaci&#243;n se encontr&#243; en equilibrio gen&#233;tico de  Hardy Weinberg (</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Symbol">c</FONT><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"><SUP>2</SUP>: 0,18; p&lt;0,01).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Al comparar los genotipos del polimorfismo S447X del gen de la LPL con  las caracter&#237;sticas antropom&#233;tricas y bioqu&#237;micas de la poblaci&#243;n estudiada,  no se encontraron diferencias significativas en los par&#225;metros estudiados  (<a href="#TABLA_II">Tabla II</a>).</FONT></P> </MULTICOL>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B><a name="TABLA_II">TABLA II</a></B></FONT></P>     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> RELACI&#211;N DEL POLIMORFISMO S447X DEL GEN DE LA LIPOPROTE&#205;NA LIPASA  CON LAS CARACTER&#205;STICAS ANTROPOM&#201;TRICAS Y BIOQU&#205;MICAS EN LA POBLACI&#211;N ESTUDIADA</FONT></P>     <div align="center"> <TABLE cellspacing="1" width="580" border="1" id="table2"> <TR> <TD WIDTH="181" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Caracter&#237;sticas fenot&#237;picas&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Poblaci&#243;n estudiada con genotipo SS&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP" BGCOLOR="#c3c3c2">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Poblaci&#243;n estudiada con genotipo SX&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP" BGCOLOR="#c3c3c2">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Valor P&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Edad (a&#241;os)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 36,82 &#177; 1.35&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 37,71 &#177; 4.22&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Peso (kg)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 85,83 &#177; 2.68&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 80,20 &#177; 8,37&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Talla (m)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 1,64 &#177; 0,01&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 1,58 &#177; 0,03&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> IMC (kg/m<SUP>2</SUP>)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 31,49 &#177; 0,85&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 31,18 &#177; 2,67&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Glicemia basal (mg/dL)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 76,1 &#177; 1,20&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 76,42 &#177; 3,75&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Insulina (&#181;U/mL)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 13,74 &#177; 1,27&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 14,42 &#177; 3,97&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Homa-IR&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 2,70 &#177; 0,30&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 2,64 &#177; 0,96&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Triglic&#233;ridos (mg/dL)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 114,04 &#177; 8,21&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 123,14 &#177; 25,59&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Colesterol (mg/dL)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 150,36 &#177; 3,95&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 160,28 &#177; 12,33&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C-HDL (mg/dL)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 38,79 &#177; 1,23&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     ]]></body>
<body><![CDATA[<P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 39,28 &#177; 1,23&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> <TR> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="LEFT"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> C-LDL (mg/dL)&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 89,52 &#177; 2,88&nbsp; </FONT></P> </TD> <TD WIDTH="181" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 93,85 &#177; 9,00&nbsp; </FONT></P> </TD> <TD WIDTH="64" VALIGN="TOP">     <P ALIGN="CENTER"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns&nbsp; </FONT></P> </TD> </TR> </TABLE> </div>     <P ALIGN="justify" style="margin-left: 20px"> <FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> ns: no significativo. Los valores se expresan en medias &#177; error est&#225;ndar.</FONT></P> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Al relacionar los genotipos del polimorfismo S447X del gen de la LPL con  los valores sangu&#237;neos de glucosa y el perfil lip&#237;dico, no se obtuvieron  valores de OR significativos estad&#237;sticamente.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>DISCUSI&#211;N</B></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Existen evidencias que demuestran la influencia de factores metab&#243;licos  y gen&#233;ticos en los niveles y la funci&#243;n de la LPL. Las anormalidades en  la funci&#243;n de esta lipoprote&#237;na se asocia con condiciones cl&#237;nicas que  incluyen: resistencia a la insulina, obesidad, hiperlipidemia y enfermedad  arterial coronaria (5).</FONT></P>     ]]></body>
<body><![CDATA[<P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> La poblaci&#243;n estudiada mostr&#243; valores elevados de IMC, indicativos de sobrepeso  y obesidad tipo 1, y valores bajos de C-HDL tanto en hombres como en mujeres,  sin que se encontrasen diferencias significativas entre los grupos genot&#237;picos  estudiados.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> M&#250;ltiples estudios asocian variantes del gen de la LPL con concentraciones  lip&#237;dicas plasm&#225;ticas y condiciones cl&#237;nicas en diferentes poblaciones  (1, 5,7-17, 24). La variante Ser447Ter (S447X) localizada en el ex&#243;n 9  da como resultado una LPL madura truncada en dos de sus amino&#225;cidos del  extremo C-terminal, regi&#243;n donde ocurre la uni&#243;n prote&#237;na-receptor, descrito  como importante factor protector de enfermedad card&#237;aca coronaria, relacionado  directamente con el incremento de su actividad enzim&#225;tica (17).</FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Este estudio analiz&#243; la variante S447X del gen de la LPL y su relaci&#243;n  con l&#237;pidos plasm&#225;ticos. Los resultados no demostraron asociaci&#243;n de la  variante S447X con las concentraciones lip&#237;dicas plasm&#225;ticas que formaron  parte del perfil lip&#237;dico analizado. Estos resultados coinciden con lo  reportado en poblaciones Cauc&#225;sicas y de Suram&#233;rica en los que se indica  ausencia de correlaci&#243;n entre la presencia del polimorfismo S447X y las  concentraciones lip&#237;dicas plasm&#225;ticas, tal como lo encontrado en la poblaci&#243;n  Zuliana (9, 17). Los hallazgos obtenidos son contrarios a diversos estudios  que relacionan la variable S447X con disminuci&#243;n de los l&#237;pidos plasm&#225;ticos,  principalmente triglic&#233;ridos, confiri&#233;ndole a la presencia del polimorfismo,  efecto protector en la aparici&#243;n de enfermedades cardiovasculares (7, 12,  17, 24). Existe a nivel mundial, controversia entre estudios que soportan  esta teor&#237;a y otros que se contraponen (5, 7-17, 24). Almeida y col. (9)  reportaron esta asociaci&#243;n solo en el grupo de hombres analizados con enfermedad  cardiaca prematura, mencionando que la reducci&#243;n de los triglic&#233;ridos en  hombres con el polimorfismo S447X est&#225; relacionada con la acci&#243;n y el nivel  de testosterona. El efecto protector en contra de las enfermedades cardiacas  y los valores lip&#237;dicos no se observ&#243; en la poblaci&#243;n total analizada ni  en el grupo espec&#237;fico de mujeres estudiadas, tanto en el grupo control  como en el grupo con enfermedad cardiaca. Algunos hallazgos reportan que  posiblemente el efecto protector anti-aterog&#233;nico del polimorfismo S447X  pueda ser independiente de los niveles lip&#237;dicos plasm&#225;ticos (9).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Las diferencias y controversias en los estudios publicados puede deberse  a factores relacionados con la compleja variabilidad gen&#233;tica de las poblaciones  estudiadas, el n&#250;mero de pacientes analizados y los criterios de inclusi&#243;n  utilizados para la selecci&#243;n de la muestra (9, 17, 24).</FONT></P> </MULTICOL> <MULTICOL GUTTER="31" COLS="2">     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Es relevante comparar las frecuencias obtenidas del polimorfismo S447X  con las reportadas por otras poblaciones. Este an&#225;lisis preliminar constituye  el primer reporte de frecuencia de la variante S447X en la poblaci&#243;n venezolana.  Las frecuencias obtenidas son similares a las reportadas en Cauc&#225;sicos  y Asi&#225;ticos por Sagoo y col. con 5,6 a 21,1% (1). Se ajustan tambi&#233;n a  otros reportes en Cauc&#225;sicos, en los que la frecuencia de la variante se  encuentra entre 9 y 10% (25-27). Las frecuencias son similares a las reportadas  en Latinoam&#233;rica (7, 9, 28) y lo reportado en poblaciones Cauc&#225;sicas de  Europa, Australia y Norte Am&#233;rica (24, 29-31) donde la frecuencia de homocigotos  447SS es la predominante en la poblaci&#243;n analizada. Estas concordancias  entre las frecuencias de nuestra poblaci&#243;n y las reportadas en Latinoam&#233;rica  obedecen a la contribuci&#243;n de ancestros americanos, europeos y africanos,  tal como se reporta en diversos estudios (32).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Una limitaci&#243;n de este an&#225;lisis es el n&#250;mero de individuos estudiados y  la ausencia de homocigosidad para el genotipo 447X, lo que limita la interpretaci&#243;n  de los resultados y no permite estudiar el efecto protector del alelo homocigoto;  por lo tanto, se sugiere ampliar el n&#250;mero de individuos analizados y confirmar  los hallazgos obtenidos en este estudio preliminar, para determinar si  con un mayor grupo de individuos y el an&#225;lisis de otros polimorfismos asociados  a este gen, es posible encontrar el efecto protector del gen de la LPL  reportado por otras poblaciones (28, 33, 34).</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> A pesar de que este estudio no arroj&#243; relaci&#243;n significativa entre los  genotipos del polimorfismo S447X del gen de la LPL y los valores lip&#237;dicos  sangu&#237;neos, los resultados obtenidos de este primer estudio realizado en  Venezuela, suministran informaci&#243;n sobre la frecuencia de esta variante,  lo que le confiere relevancia y utilidad para los estudios de gen&#233;tica  de poblaciones en Latinoam&#233;rica. Es importante la realizaci&#243;n de estudios  posteriores en el gen de la LPL, u otros genes cercanos a &#233;ste, que pudieran  influir en la gen&#233;tica de las dislipidemias, y su relaci&#243;n con el desarrollo  de las enfermedades cardiovasculares.</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>AGRADECIMIENTOS</B></FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> Este trabajo fue realizado con el apoyo del Consejo de Desarrollo Cient&#237;fico  y Human&#237;stico de la Universidad del Zulia (CONDES-LUZ CC-0419-10)</FONT></P>     <P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> <B>REFERENCIAS</B></FONT></P>     ]]></body>
<body><![CDATA[<!-- ref --><P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 1.&nbsp;<B>Sagoo G, Tatt I, Salanti G, Butterworth A, Sarwar N, van Maarle M, Jukema  J, Wiman B, Kastelein J, Bennet A, de Faire U, Danesh J, Higgins J.</B> Seven  lipoprotein lipase gene polymorphisms, lipid fractions, and coronary disease.  Am J Epidemiol 2008; 168:1233-1246.</FONT>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;[&#160;<a href="javascript:void(0);" onclick="javascript: window.open('/scielo.php?script=sci_nlinks&ref=1216999&pid=S0535-5133201400020000400001&lng=','','width=640,height=500,resizable=yes,scrollbars=1,menubar=yes,');">Links</a>&#160;]<!-- end-ref --><!-- ref --><P ALIGN="justify"><FONT COLOR="#1f1a17" SIZE="2" FACE="Verdana"> 2.&nbsp;<B>Lago F</B>. Dislipidemias. 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