An examination of the origin and evolution of additional tandem repeats in the mitochondrial DNA control region of Japanese sika deer (Cervus Nippon)
文献类型: 外文期刊
第一作者: Ba, Hengxing
作者: Ba, Hengxing;Liu, Zongyue;Li, Chunyi;Ba, Hengxing;Liu, Zongyue;Li, Chunyi;Wu, Lang
作者机构:
关键词: Cervus Nippon;control region;evolution;tandem repeats
期刊名称:MITOCHONDRIAL DNA PART A ( 影响因子:1.514; 五年影响因子:0.707 )
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年卷期:
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收录情况: SCI
摘要: Tandem repeat units are only detected in the left domain of the mitochondrial DNA control region in sika deer. Previous studies showed that Japanese sika deer have more tandem repeat units than its cousins from the Asian continent and Taiwan, which often have only three repeat units. To determine the origin and evolution of these additional repeat units in Japanese sika deer, we obtained the sequence of repeat units from an expanded dataset of the control region from all sika deer lineages. The functional constraint is inferred to act on the first repeat unit because this repeat has the least sequence divergence in comparison to the other units. Based on slipped-strand mispairing mechanisms, the illegitimate elongation model could account for the addition or deletion of these additional repeat units in the Japanese sika deer population. We also report that these additional repeat units could be occurring in the internal positions of tandem repeat regions, possibly via coupling with a homogenizationmechanism within and among these lineages. Moreover, the increased number of repeat units in the Japanese sika deer population could reflect a balance between mutation and selection, as well as genetic drift.
分类号: Q7
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