Widespread horizontal gene transfer from double-stranded RNA viruses to eukaryotic nuclear genomes

J Virol. 2010 Nov;84(22):11876-87. doi: 10.1128/JVI.00955-10. Epub 2010 Sep 1.

Abstract

Horizontal gene transfer commonly occurs from cells to viruses but rarely occurs from viruses to their host cells, with the exception of retroviruses and some DNA viruses. However, extensive sequence similarity searches in public genome databases for various organisms showed that the capsid protein and RNA-dependent RNA polymerase genes from totiviruses and partitiviruses have widespread homologs in the nuclear genomes of eukaryotic organisms, including plants, arthropods, fungi, nematodes, and protozoa. PCR amplification and sequencing as well as comparative evidence of junction coverage between virus and host sequences support the conclusion that these viral homologs are real and occur in eukaryotic genomes. Sequence comparison and phylogenetic analysis suggest that these genes were likely transferred horizontally from viruses to eukaryotic genomes. Furthermore, we present evidence showing that some of the transferred genes are conserved and expressed in eukaryotic organisms and suggesting that these viral genes are also functional in the recipient genomes. Our findings imply that horizontal transfer of double-stranded RNA viral genes is widespread among eukaryotes and may give rise to functionally important new genes, thus entailing that RNA viruses may play significant roles in the evolution of eukaryotes.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Amino Acid Sequence
  • Animals
  • Cell Nucleus / genetics
  • Cell Nucleus / virology*
  • Eukaryota / genetics*
  • Eukaryota / virology*
  • Evolution, Molecular
  • Gene Transfer, Horizontal*
  • Genome*
  • Molecular Sequence Data
  • Phylogeny
  • Plants / genetics
  • Plants / virology
  • RNA Viruses / classification
  • RNA Viruses / genetics*
  • RNA Viruses / physiology
  • RNA, Double-Stranded / genetics
  • RNA, Viral / genetics
  • Sequence Alignment

Substances

  • RNA, Double-Stranded
  • RNA, Viral

Associated data

  • GENBANK/HM068619
  • GENBANK/HM068620