Transfer of chloroplast genomic DNA to mitochondrial genome occurred at least 300 MYA

Daryi Wang, Yu Wei Wu, Arthur Chun Chieh Shih, Chung Shien Wu, Ya Nan Wang, Shu Miaw Chaw

研究成果: 雜誌貢獻文章同行評審

65 引文 斯高帕斯(Scopus)

摘要

With the completion of the first gymnosperm mitochondrial genome (mtDNA) from Cycas taitungensis and the availability of more mtDNA taxa in the past 5 years, we have conducted a systematic analysis of DNA transfer from chloroplast genomes (cpDNAs) to mtDNAs (mtpts) in 11 plants, including 2 algae, 1 liverwort, 1 moss, 1 gymnosperm, 3 monocots, and 3 eudicots. By using shared gene order and boundaries between different mtpts as the criterion, the timing of cpDNA transfer during plant evolution was estimated from the phylogenetic tree reconstructed independently from concatenated protein-coding genes of 11 available mtDNAs. Several interesting findings emerged. First, frequent DNA transfer from cpDNA to mtDNA occurred at least as far back as the common ancestor of extant gymnosperms and angiosperms, about 300 MYA. The oldest mtpt is trnV(uac)-trnM(cau)-atpE-atpB-rbcL. Three other mtpts - psaA-psaB, rps19-trnH(gug)-rpl2-rpl23, and psbE-psbF - were dated to the common ancestor of extant angiosperms, at least 150 MYA. However, all protein-coding genes of mtpts have degenerated since their first transfer. Therefore, mtpts contribute nothing to the functioning of mtDNA but junk sequences. We discovered that the cpDNA transfers have occurred randomly at any positions of the cpDNAs. We provide strong evidence that the cp-derived tRNA-trnM(cau) is the only mtpt (1 out of 3 cp-derived tRNA shared by seed plants) truly transferred from cpDNA to mtDNA since the time of the common ancestor of extant gymnosperms and angiosperms. Our observations support the proposition of Richly and Leister (2004) that "primary insertions of organellar DNAs are large and then diverge and fragment over evolutionary time."
原文英語
頁(從 - 到)2040-2048
頁數9
期刊Molecular Biology and Evolution
24
發行號9
DOIs
出版狀態已發佈 - 9月 2007
對外發佈

ASJC Scopus subject areas

  • 遺傳學
  • 生物化學
  • 遺傳學(臨床)
  • 生物化學、遺傳與分子生物學 (全部)
  • 生態學、進化論、行為學與系統學
  • 農業與生物科學(雜項)
  • 分子生物學

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