Molecular Biology and Evolution 17:320-330 (2000)
© 2000 Society for Molecular Biology and Evolution
Articles |
Evolutionary History of the Human Endogenous Retrovirus Family ERV9
*Departamento de Bioloxía Fundamental, Facultade de Bioloxía, Universidade de Santiago de Compostela, Santiago de Compostela, Spain;
and
Departamento de Bioloxía Celular e Molecular, Facultade de Ciencias, Universidade de A Coruña, A Coruña, Spain
Several distinct families of endogenous retrovirus-like elements (ERVs) exist in the genomes of primates. Despite the important evolutionary consequences that carrying these intragenomic parasites may have for their hosts, our knowledge about their evolution is still scarce. A matter of particular interest is whether evolution of ERVs occurs via a master lineage or through several lineages coexisting over long periods of time. In this work, the paleogenomic approach has been applied to the study of the evolution of ERV9, one of the human endogenous retrovirus families mobilized during primate evolution. By searching the GenBank database with the first 676 bp of the ERV9 long terminal repeat, we identified 156 different element insertions into the human genome. These elements were grouped into 14 subfamilies based on several characteristic nucleotide differences. The age of each subfamily was roughly estimated based on the average sequence divergence of its members from the subfamily consensus sequence. Determination of the sequential order of diagnostic substitutions led to the identification of four distinct lineages, which retained their capacity of transposition over extended periods of evolution. Strong evidence for mosaic evolution of some of these lineages is presented. Taken altogether, the available data indicate that the possibility of ERV9 still being active in the human lineage can not be discarded.
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