Recombination and base composition: the case of the highly self-fertilizing plant Arabidopsis thaliana.

Abstract:

BACKGROUND:Rates of recombination can vary among genomic regions in eukaryotes, and this is believed to have major effects on their genome organization in terms of base composition, DNA repeat density, intron size, evolutionary rates and gene order. In highly self-fertilizing species such as Arabidopsis thaliana, however, heterozygosity is expected to be strongly reduced and recombination will be much less effective, so that its influence on genome organization should be greatly reduced. RESULTS:Here we investigated theoretically the joint effects of recombination and self-fertilization on base composition, and tested the predictions with genomic data from the complete A. thaliana genome. We show that, in this species, both codon-usage bias and GC content do not correlate with the local rates of crossing over, in agreement with our theoretical results. CONCLUSIONS:We conclude that levels of inbreeding modulate the effect of recombination on base composition, and possibly other genomic features (for example, transposable element dynamics). We argue that inbreeding should be considered when interpreting patterns of molecular evolution.

journal_name

Genome Biol

journal_title

Genome biology

authors

Marais G,Charlesworth B,Wright SI

doi

10.1186/gb-2004-5-7-r45

keywords:

subject

Has Abstract

pub_date

2004-01-01 00:00:00

pages

R45

issue

7

eissn

1474-7596

issn

1474-760X

pii

gb-2004-5-7-r45

journal_volume

5

pub_type

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