Non-neutral processes drive the nucleotide composition of non-coding sequences in Drosophila.

Non-neutral processes drive the nucleotide composition of non-coding sequences in Drosophila.
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DOI:
10.1098/rsbl.2008.0174
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发表时间:
2008-08-23
期刊:
影响因子:
3.3
通讯作者:
Charlesworth, Brian
Charlesworth, Brian
中科院分区:
生物学2区
文献类型:
--
作者:
Haddrill, Penelope R.;Charlesworth, Brian

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影响碱基组成的力的性质是基因组进化中的一个关键问题。非编码序列GC含量的差异是否反映了突变偏倚的差异,或者选择或偏倚基因转换的强度的差异,还不确定。我们已经使用了一个多态性数据集的非编码序列的X染色体上的果蝇simulans来研究这个问题。GC→AT和AT→GC多态性突变的比例与GC含量相关。这意味着力的作用有利于GC超过AT碱基对,这在富含GC的序列中显然是最强的。
The nature of the forces affecting base composition is a key question in genome evolution. There is uncertainty as to whether differences in the GC contents of non-coding sequences reflect differences in mutational bias, or in the intensity of selection or biased gene conversion. We have used a polymorphism dataset for non-coding sequences on the X chromosome of Drosophila simulans to examine this question. The proportion of GC→AT versus AT→GC polymorphic mutations in a locus is correlated with its GC content. This implies the action of forces that favour GC over AT base pairs, which are apparently strongest in GC-rich sequences.
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