title: Mitochondrial genome nucleotide substitution pattern between domesticated silkmoth, Bombyx mori, and its wild ancestors, Chinese Bombyx mandarina and Japanese Bombyx mandarina.
abstract: Bombyx mori and Bombyx mandarina are morphologically and physiologically similar. In this study, we compared the nucleotide variations in the complete mitochondrial (mt) genomes between the domesticated silkmoth, B. mori, and its wild ancestors, Chinese B. mandarina (ChBm) and Japanese B. mandarina (JaBm). The sequence divergence and transition mutation ratio between B. mori and ChBm are significantly smaller than those observed between B. mori and JaBm. The preference of transition by DNA strands between B. mori and ChBm is consistent with that between B. mori and JaBm, however, the regional variation in nucleotide substitution rate shows a different feature. These results suggest that the ChBm mt genome is not undergoing the same evolutionary process as JaBm, providing evidence for selection on mtDNA. Moreover, investigation of the nucleotide sequence divergence in the A+T-rich region of Bombyx mt genomes also provides evidence for the assumption that the A+T-rich region might not be the fastest evolving region of the mtDNA of insects.
authors.affiliation: College of Bioscience and Biotechnology, Shenyang Agricultural University, Liaoning, Shenyang China.
authors.forename: Yu-Ping
authors.initials: YP
authors.lastname: Li
authors.forename: Wu
authors.initials: W
authors.lastname: Song
authors.forename: Sheng-Lin
authors.initials: SL
authors.lastname: Shi
authors.forename: Yan-Qun
authors.initials: YQ
authors.lastname: Liu
authors.forename: Min-Hui
authors.initials: MH
authors.lastname: Pan
authors.forename: Fang-Yin
authors.initials: FY
authors.lastname: Dai
authors.forename: Cheng
authors.initials: C
authors.lastname: Lu
authors.forename: Zhong-Huai
authors.initials: ZH
authors.lastname: Xiang