哪种细菌是动物线粒体基因组的祖先？
Which bacterium is the ancestor of the animal mitochondrial genome?
作者信息
Karlin S, Campbell A M
机构信息
Department of Mathematics, Stanford University, CA 94305.
出版信息
Proc Natl Acad Sci U S A. 1994 Dec 20;91(26):12842-6. doi: 10.1073/pnas.91.26.12842.
Abstract
We present considerable data supporting the hypothesis that a Sulfolobus- or Mycoplasma-like endosymbiont, rather than an alpha-proteobacterium, is the ancestor of animal mitochondrial genomes. This hypothesis is based on pronounced similarities in oligonucleotide relative abundance extremes common to animal mtDNA, Sulfolobus, and Mycoplasma capricolum and pronounced discrepancies of these relative abundance values with respect to alpha-proteobacteria. In addition, genomic dinucleotide relative abundance measures place Sulfolobus and M. capricolum among the closest to animal mitochondrial genomes, whereas the classical eubacteria, especially the alpha-proteobacteria, are at excessive distances. There are also considerable molecular and cellular phenotypic analogies among mtDNA, Sulfolobus, and M. capricolum.
摘要
我们提供了大量数据，支持这样一种假说：动物线粒体基因组的祖先并非α-变形菌，而是类似硫化叶菌或支原体的内共生体。这一假说基于动物线粒体DNA、硫化叶菌和山羊支原体中常见的寡核苷酸相对丰度极端值之间的显著相似性，以及这些相对丰度值与α-变形菌之间的显著差异。此外，基因组二核苷酸相对丰度测量结果表明，硫化叶菌和山羊支原体与动物线粒体基因组最为接近，而传统真细菌，尤其是α-变形菌，则距离较远。线粒体DNA、硫化叶菌和山羊支原体之间也存在相当多的分子和细胞表型相似之处。
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