Evolution of genome size in drosophila.: Is the invader's genome being invaded by transposable elements?

被引:67
作者
Vieira, C
Nardon, C
Arpin, C
Lepetit, D
Biémont, C
机构
[1] Univ Lyon 1, Lab Biometrie & Biol Evolut, UMR CNRS 5558, F-69622 Villeurbanne, France
[2] INSERM U503, CERVI, Lyon 07, France
关键词
genome size; Drosophila; transposable elements;
D O I
10.1093/oxfordjournals.molbev.a004173
中图分类号
Q5 [生物化学]; Q7 [分子生物学];
学科分类号
071010 ; 081704 ;
摘要
Genome size varies considerably between species, and transposable elements (TEs) are known to play an important role in this variability. However, it is far from clear whether TEs are involved in genome size differences between populations within a given species. We show here that in Drosophila melanogaster and Drosophila simulans the size of the genome varies among Populations and is correlated with the TE COPY number on the chromosome arms. The TEs embedded within the heterochromatin do not seem to be involved directly in this phenomenon, although they may contribute to differences in genome size. Furthermore, genome size and TE content variations parallel the worldwide colonization of D. melanogaster species. No such relationship exists for the more recently dispersed D. simulans species, which indicates that a quantitative increase in the TEs in local populations and fly migration are Sufficient to account for the increase in genome size, with no need for an adaptation hypothesis.
引用
收藏
页码:1154 / 1161
页数:8
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