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Evolutionary changes in CpG and methylation levels in the genome of vertebrates

Identifieur interne : 000C18 ( Istex/Corpus ); précédent : 000C17; suivant : 000C19

Evolutionary changes in CpG and methylation levels in the genome of vertebrates

Auteurs : Kamel Jabbari ; Simone Cacci ; Jean Paul Païs De Barros ; Jean Desgrès ; Giorgio Bernardi

Source :

RBID : ISTEX:6C21D515B9F9DD286CA9018CD70018D6E5D6179D

Abstract

We have analysed the levels of 5-methylcytosine (5mC) in DNAs from 42 vertebrates, and compiled, including data from literature, a table of genomic 5mC and GC levels (as well as the available c-values, i.e., the haploid genome sizes) of 87 species from all vertebrate classes. An analysis of the data indicates that (i) two positive correlations hold between the 5mC and GC levels of the genomes of fishes/amphibians and mammals/birds, respectively; (ii) the genomes of fishes and amphibians are, on average, about twice as methylated as those of mammals, birds and reptiles, this difference being unrelated to the amounts of repetitive DNA sequences; (iii) the 5mC and CpG observed/expected values show no overlap between the two groups of vertebrates and suggest the existence of two equilibria. The transition separating the two equilibria appears to have taken place at the time of appearance of reptiles. Its possible cause(s) and its implications are discussed.

Url:
DOI: 10.1016/S0378-1119(97)00475-7

Links to Exploration step

ISTEX:6C21D515B9F9DD286CA9018CD70018D6E5D6179D

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<ce:abstract-sec>
<ce:simple-para>We have analysed the levels of 5-methylcytosine (5mC) in DNAs from 42 vertebrates, and compiled, including data from literature, a table of genomic 5mC and GC levels (as well as the available c-values, i.e., the haploid genome sizes) of 87 species from all vertebrate classes. An analysis of the data indicates that (i) two positive correlations hold between the 5mC and GC levels of the genomes of fishes/amphibians and mammals/birds, respectively; (ii) the genomes of fishes and amphibians are, on average, about twice as methylated as those of mammals, birds and reptiles, this difference being unrelated to the amounts of repetitive DNA sequences; (iii) the 5mC and CpG observed/expected values show no overlap between the two groups of vertebrates and suggest the existence of two equilibria. The transition separating the two equilibria appears to have taken place at the time of appearance of reptiles. Its possible cause(s) and its implications are discussed.</ce:simple-para>
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</ce:abstract>
<ce:keywords>
<ce:section-title>Keywords</ce:section-title>
<ce:keyword>
<ce:text>CpG dinucleotide</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Isochore</ce:text>
</ce:keyword>
<ce:keyword>
<ce:text>Vertebrate evolution</ce:text>
</ce:keyword>
</ce:keywords>
<ce:keywords class="abr">
<ce:section-title>Abbreviations</ce:section-title>
<ce:keyword>
<ce:text>Br84</ce:text>
<ce:keyword>
<ce:text>8-bromoguanosine</ce:text>
</ce:keyword>
</ce:keyword>
<ce:keyword>
<ce:text>5mC</ce:text>
<ce:keyword>
<ce:text>5-methylcytosine</ce:text>
</ce:keyword>
</ce:keyword>
<ce:keyword>
<ce:text>GC</ce:text>
<ce:keyword>
<ce:text>molar fraction of guanine+cytosine in DNA</ce:text>
</ce:keyword>
</ce:keyword>
<ce:keyword>
<ce:text>HPLC</ce:text>
<ce:keyword>
<ce:text>high-performance liquid chromatography</ce:text>
</ce:keyword>
</ce:keyword>
</ce:keywords>
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<title>Evolutionary changes in CpG and methylation levels in the genome of vertebrates</title>
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<title>Evolutionary changes in CpG and methylation levels in the genome of vertebrates</title>
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<name type="personal">
<namePart type="given">Kamel</namePart>
<namePart type="family">Jabbari</namePart>
<affiliation>Laboratoire de Génétique Moléculaire, Institut Jacques Monod, 2 Place Jussieu, 75005 Paris, France</affiliation>
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<roleTerm type="text">author</roleTerm>
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<name type="personal">
<namePart type="given">Simone</namePart>
<namePart type="family">Cacciò</namePart>
<affiliation>Laboratoire de Génétique Moléculaire, Institut Jacques Monod, 2 Place Jussieu, 75005 Paris, France</affiliation>
<affiliation>1 Present address: Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Roma, Italy</affiliation>
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<roleTerm type="text">author</roleTerm>
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<name type="personal">
<namePart type="given">Jean Paul</namePart>
<namePart type="family">Païs de Barros</namePart>
<affiliation>Laboratoire de Biochimie Médicale, Faculté de Médecine et Centre Hospitalier Universitaire, 7 Bd Jeanne d'Arc, 21033 Dijon, France</affiliation>
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<roleTerm type="text">author</roleTerm>
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<name type="personal">
<namePart type="given">Jean</namePart>
<namePart type="family">Desgrès</namePart>
<affiliation>Laboratoire de Biochimie Médicale, Faculté de Médecine et Centre Hospitalier Universitaire, 7 Bd Jeanne d'Arc, 21033 Dijon, France</affiliation>
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<roleTerm type="text">author</roleTerm>
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<name type="personal">
<namePart type="given">Giorgio</namePart>
<namePart type="family">Bernardi</namePart>
<affiliation>Corresponding author. Tel.: +33 1 43295824; Fax: +33 1 44277977.</affiliation>
<affiliation>Laboratoire de Génétique Moléculaire, Institut Jacques Monod, 2 Place Jussieu, 75005 Paris, France</affiliation>
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<abstract lang="en">We have analysed the levels of 5-methylcytosine (5mC) in DNAs from 42 vertebrates, and compiled, including data from literature, a table of genomic 5mC and GC levels (as well as the available c-values, i.e., the haploid genome sizes) of 87 species from all vertebrate classes. An analysis of the data indicates that (i) two positive correlations hold between the 5mC and GC levels of the genomes of fishes/amphibians and mammals/birds, respectively; (ii) the genomes of fishes and amphibians are, on average, about twice as methylated as those of mammals, birds and reptiles, this difference being unrelated to the amounts of repetitive DNA sequences; (iii) the 5mC and CpG observed/expected values show no overlap between the two groups of vertebrates and suggest the existence of two equilibria. The transition separating the two equilibria appears to have taken place at the time of appearance of reptiles. Its possible cause(s) and its implications are discussed.</abstract>
<subject>
<genre>Keywords</genre>
<topic>CpG dinucleotide</topic>
<topic>Isochore</topic>
<topic>Vertebrate evolution</topic>
</subject>
<subject>
<genre>Abbreviations</genre>
<topic>Br84 : 8-bromoguanosine</topic>
<topic>5mC : 5-methylcytosine</topic>
<topic>GC : molar fraction of guanine+cytosine in DNA</topic>
<topic>HPLC : high-performance liquid chromatography</topic>
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<title>Gene</title>
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<namePart>Junk DNA: The Role and the Evolution of Non-Coding Sequences, Guanacaste, Costa Rica</namePart>
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<namePart type="date">19970110</namePart>
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<identifier type="ISSN">0378-1119</identifier>
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<title>Junk DNA: The Role and the Evolution of Non-Coding Sequences, Guanacaste, Costa Rica</title>
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<number>205</number>
<caption>vol.</caption>
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<detail type="issue">
<number>1–2</number>
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