Oxygen and guanine-cytosine profiles in marine environments.

Oxygen and guanine-cytosine profiles in marine environments.
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DOI:
10.1007/s00239-009-9230-9
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发表时间:
2009-08
影响因子:
3.9
通讯作者:
Musto, Hector
Musto, Hector
中科院分区:
生物学3区
文献类型:
--
作者:
Romero, Hector;Pereira, Emiliano;Naya, Hugo;Musto, Hector

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分子进化中的一个历史性争论涉及原核生物基因组鸟嘌呤-胞嘧啶(GC)含量的强烈变化,范围约为20-75%:这个因素是选择性中性的,还是自然选择的结果?在我们小组发表的前一篇文章中,我们表明,在原核生物的明确分类组中,严格需氧生物倾向于显示出比严格厌氧物种更高的基因组GC水平。在本研究中,我们研究了GC含量的片段的DNA从微生物群落沿着一个明确的环境梯度:4,000米的垂直剖面在北太平洋副热带环流。GC的分布模式可能与海水柱中的氧浓度有关。这些结果进一步支持生理性状(有氧呼吸)和基因组GC含量之间的联系。
One of the historic debates in molecular evolution concerns the strong variation in the genomic guanine–cytosine (GC) content of prokaryotes, which ranges from approximately 20–75%: Is this factor selectively neutral, or is it the result of natural selection? In a previous article published by our group, we showed that inside well-defined taxonomic groups of prokaryotes, strictly aerobic organisms tend to display higher genomic GC levels than strictly anaerobic species. In the present study, we examined the GC content of fragments of DNA obtained from microbial communities along a well-defined environmental gradient: a 4,000-m vertical profile in the North Pacific subtropical gyre. The patterns of GC distribution might be associated with oxygen concentrations in the seawater column. These results give further support to the link between a physiologic trait (aerobic respiration) and genomic GC content.
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