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
中科院分区:
文献类型:
--
作者:
Haddrill, Penelope R.;Charlesworth, Brian
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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