RNA editing in gymnosperms and its impact on the evolution of the mitochondrial coxI gene.

摘要: Sequence analysis of the mitochondrial coxI gene in eight gymnosperm species revealed a high rate non-synonymous nucleotide substitutions with strong (98%) predominance C-T substitutions. Further corresponding cDNA sequences showed that all changes genomic DNA were eliminated by RNA editing resulting nearly identical mRNA (amino acid) among species. Pronounced variation number and location edited sites was found Most had relatively large (from 25 to 34). However, no sequence Gingko biloba or Larix sibirica. The composition investigated fragment suggests G. L. sibirica originated from transcripts reverse transcription followed insertion into nuclear genome back genome. Our results also demonstrate where there are sites, can accelerate divergence