Evolution of CHR-2 SINEs in cetartiodactyl genomes: possible evidence for the monophyletic origin of toothed whales

Mamm Genome. 2001 Dec;12(12):909-15. doi: 10.1007/s0033501-1015-4.

Abstract

Short interspersed repetitive elements (SINEs) are a kind of retroposons dispersed among the eukaryotic genomes. Previously, we isolated and characterized a new SINE family, named CHR-2, members of which are distributed in the genomes of cetaceans, hippopotamuses, and ruminants. We analyzed systematically more than a hundred members of the CHR-2 SINEs, which were isolated from the genomes of cetaceans and cow, together with the additional data available in the DNA databases, and showed that these SINEs are divided into at least five distinct subfamilies that share diagnostic nucleotides and/or deletions. A hybridization analysis clearly demonstrated that, among these five subfamilies, two subfamilies, named CD and CDO, are specific to cetaceans and toothed whales, respectively. We reconstruct the evolutionary history of the CHR-2 SINEs during evolution of cetartiodactyl genomes.

Publication types

  • Comparative Study
  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Artiodactyla / genetics
  • Base Sequence
  • Cattle / genetics
  • Dolphins / genetics
  • Evolution, Molecular*
  • Molecular Sequence Data
  • Phylogeny
  • Porpoises / genetics
  • Retroelements / genetics*
  • Sequence Alignment
  • Sequence Deletion
  • Sequence Homology, Nucleic Acid
  • Short Interspersed Nucleotide Elements / genetics*
  • Species Specificity
  • Whales / genetics*

Substances

  • Retroelements

Associated data

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