<?xml version="1.0" encoding="ISO-8859-1"?><article xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance">
<front>
<journal-meta>
<journal-id>1405-888X</journal-id>
<journal-title><![CDATA[TIP. Revista especializada en ciencias químico-biológicas]]></journal-title>
<abbrev-journal-title><![CDATA[TIP]]></abbrev-journal-title>
<issn>1405-888X</issn>
<publisher>
<publisher-name><![CDATA[Universidad Nacional Autónoma de México, Facultad de Estudios Superiores Zaragoza]]></publisher-name>
</publisher>
</journal-meta>
<article-meta>
<article-id>S1405-888X2018000100034</article-id>
<article-id pub-id-type="doi">10.1016/j.recqb.2017.08.004</article-id>
<title-group>
<article-title xml:lang="es"><![CDATA[El cromo (VI) induce la frecuencia de mutación y pérdida de heterocigocidad en Saccharomyces cerevisiae]]></article-title>
<article-title xml:lang="en"><![CDATA[Chromium (VI) induces the mutation frequency and loss of heterocigocity in Saccharomyces cerevisiae]]></article-title>
</title-group>
<contrib-group>
<contrib contrib-type="author">
<name>
<surname><![CDATA[Santoyo]]></surname>
<given-names><![CDATA[Gustavo]]></given-names>
</name>
<xref ref-type="aff" rid="Aff"/>
</contrib>
</contrib-group>
<aff id="Af1">
<institution><![CDATA[,Universidad Michoacana de San Nicolás de Hidalgo Instituto de Investigaciones Químico-Biológicas ]]></institution>
<addr-line><![CDATA[Morelia Michoacán]]></addr-line>
<country>Mexico</country>
</aff>
<pub-date pub-type="pub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<pub-date pub-type="epub">
<day>00</day>
<month>06</month>
<year>2018</year>
</pub-date>
<volume>21</volume>
<numero>1</numero>
<fpage>34</fpage>
<lpage>39</lpage>
<copyright-statement/>
<copyright-year/>
<self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_arttext&amp;pid=S1405-888X2018000100034&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_abstract&amp;pid=S1405-888X2018000100034&amp;lng=en&amp;nrm=iso"></self-uri><self-uri xlink:href="http://www.scielo.org.mx/scielo.php?script=sci_pdf&amp;pid=S1405-888X2018000100034&amp;lng=en&amp;nrm=iso"></self-uri><abstract abstract-type="short" xml:lang="es"><p><![CDATA[Resumen El cromo (Cr) es uno de los principales contaminantes en desechos industriales, asociado con diversos daños a la salud humana, motivo por el que en este trabajo analizamos el efecto del Cr hexavalente sobre la frecuencia de mutación espontánea (utilizando el gen reportero CAN1) y la pérdida de heterocigocidad en la levadura Saccharomyces cerevisiae. Se comparó su efecto en una mutante en el gen rev3, que codifica para la polimerasa zeta. Los resultados sugieren que el Cr(VI) puede inducir la frecuencia de mutación entre 20 y 28 veces, a concentraciones de 25 y 50 mM, respectivamente e incrementarse en una mutante rev3 y aunque no se observaron los mismos niveles como en la cepa silvestre, esto sugiere que, además de rev3, existen otros factores que inducen la aparición de mutaciones en el marcador empleado. El Cr también tuvo un efecto al aumentar la pérdida de heterocigocidad de entre 50 y 57 veces en la cepa silvestre y la mutante rev3, respectivamente. Estos resultados muestran que REV3 participa en el efecto mutagénico causado por el Cr(VI), pero no en la pérdida de heterocigocidad, en las células de la levadura.]]></p></abstract>
<abstract abstract-type="short" xml:lang="en"><p><![CDATA[Abstract Chromium (Cr) is one of the main pollutants in industrial waste, so it has been associated with various damages to human health. Therefore, in this work we analyze the effect of the hexavalent Cr on the frequency of spontaneous mutation (by using the forward mutation reporter CAN1) and the loss of heterozygosity in the yeast Saccharomyces cerevisiae, and in a mutant in the rev3 gene, which codes for the zeta polymerase. The results suggest that Cr (VI) can induce mutation frequency between 20 and 28-fold, at concentrations of 25 and 50 mM, respectively. This mutation frequency also increased in a rev3 mutant, although the same levels were not observed as in the wild strain, suggesting that in addition to rev3, there are other factors also participate during mutation induction in CAN1 marker. Cr also had an effect by increasing the heterozygosity loss of between 50 and 57-fold in the wild-type strain and the rev3 mutant, respectively. These results show that REV3 participates in the mutagenic effect caused Cr (VI), but not in the loss of heterozygosity, in yeast cells.]]></p></abstract>
<kwd-group>
<kwd lng="es"><![CDATA[cromo hexavalente]]></kwd>
<kwd lng="es"><![CDATA[frecuencia de mutación]]></kwd>
<kwd lng="es"><![CDATA[levadura]]></kwd>
<kwd lng="en"><![CDATA[hexavalent chromium]]></kwd>
<kwd lng="en"><![CDATA[mutation frequency]]></kwd>
<kwd lng="en"><![CDATA[yeast]]></kwd>
</kwd-group>
</article-meta>
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