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arXiv 0709.2030q-bio.GNq-bio.PE
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蛋白质结构域作为遗传转移的单位

Protein domains as units of genetic transfer

Cheong Xin Chan, Robert G. Beiko, Aaron E. Darling, Mark A. Ragan

摘要:

基因组作为模块进化。在原核生物(和一些真核生物)中,遗传物质可以在物种之间转移,并通过同源或非法重组整合到基因组中。我们没有理由认为这些转移单位对应于整个基因;然而,这些单位尚未得到严格的表征。我们研究了来自144个原核基因组的单拷贝基因家族中的片段遗传转移,发现断点比偶然预期的更接近编码注释的蛋白质结构域的基因组区域的边界,特别是当重组序列更加分散时。这种相关性来自重组事件本身,而不是来自不同的核苷酸取代。我们报告的第一个系统的研究有关基因重组的结构特征在蛋白质水平。

英文摘要:

Genomes evolve as modules. In prokaryotes (and some eukaryotes), genetic material can be transferred between species and integrated into the genome via homologous or illegitimate recombination. There is little reason to imagine that the units of transfer correspond to entire genes; however, such units have not been rigorously characterized. We examined fragmentary genetic transfers in single-copy gene families from 144 prokaryotic genomes and found that breakpoints are located significantly closer to the boundaries of genomic regions that encode annotated structural domains of proteins than expected by chance, particularly when recombining sequences are more divergent. This correlation results from recombination events themselves and not from differential nucleotide substitution. We report the first systematic study relating genetic recombination to structural features at the protein level.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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