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原文連結
論文資訊
- 類型：已發表論文
- 日期：2013-04-05
摘要
Prokaryotic 基因組s are small and compact. Either this feature is caused by neutral 演化 or by 自然選擇 favoring small 基因組s-基因組 streamlining. Three separate prior lines of evidence argue against streamlining for most prokaryotes. We find that the same three lines of evidence argue for streamlining in the 基因組s of thermophile 細菌. Specifically, with increasing habitat temperature and decreasing 基因組 size, the proportion of genomic DNA in intergenic regions decreases. Furthermore, with increasing habitat temperature, generation time decreases. 基因組-wide selective constraints do not decrease as in the reduced 基因組s of host-associated 物種. Reduced habitat variability is not a likely explanation for the smaller 基因組s of thermophiles. 基因組 size may be an indirect target of selection due to its association with c
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