Insertions/Deletions-Associated Nucleotide Polymorphism in Arabidopsis thaliana
文献类型: 外文期刊
第一作者: Guo, Changjiang
作者: Guo, Changjiang;Wang, Long;Yang, Sihai;Tian, Dacheng;Du, Jianchang;Mauricio, Rodney;Gu, Tingting;Gu, Tingting
作者机构:
关键词: structural variation;insertion;deletion;nucleotide polymorphism;nucleotide dimorphism
期刊名称:FRONTIERS IN PLANT SCIENCE ( 影响因子:5.753; 五年影响因子:6.612 )
ISSN: 1664-462X
年卷期: 2016 年 7 卷
页码:
收录情况: SCI
摘要: Although high levels of within-species variation are commonly observed, a general mechanism for the origin of such variation is still lacking. Insertions and deletions (indels) are a widespread feature of genomes and we hypothesize that there might be an association between indels and patterns of nucleotide polymorphism. Here, we investigate flanking sequences around 18 indels (>100 bp) among a large number of accessions of the plant, Arabidopsis thaliana. We found two distinct haplotypes, i.a, a nucleotide dimorphism, present around each of these indels and dimorphic haplotypes always corresponded to the indel-present/-absent patterns. In addition, the peaks of nucleotide diversity between the two divergent alleles were closely associated with these indels. Thus, there exists a close association between indels and dimorphisms. Further analysis suggests that indel-associated substitutions could be an important component of genetic variation shaping nucleotide polymorphism in Arabidopsis. Finally, we suggest a mechanism by which indels might generate these highly divergent haplotypes. This study provides evidence that nucleotide dimorphisms, which are frequently regarded as evidence of frequency-dependent selection, could be explained simply by structural variation in the genome.
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