title: Evidence for the persistence of an active endogenous retrovirus (ERVE) in humans.
abstract: Transposable elements (TEs) account for nearly half (44 %) of the human genome. However, their overall activity has been steadily declining over the past 35-50 million years, so that <0.05 % of TEs are presumably still "alive" (potentially transposable) in human populations. All the active elements are retrotransposons, either autonomous (LINE-1 and possibly the endogenous retrovirus ERVK), or non-autonomous (Alu and SVA, whose transposition is dependent on the LINE-1 enzymatic machinery). Here we show that a lineage of the endogenous retrovirus ERVE was recently engaged in ectopic recombination events and may have at least one potentially fully functional representative, initially reported as a novel retrovirus isolated from blood cells of a Chinese patient with chronic myeloid leukemia, which bears signals of positive selection on its envelope region. Altogether, there is strong evidence that ERVE should be included in the short list of potentially active TEs, and we give clues on how to identify human specific insertions of this element that are likely to be segregating in some of our populations.
authors.affiliation: Grupo de Investigación en Bioloxía Evolutiva, Departamento de Bioloxía Celular e Molecular, Centro de Investigaciones Científicas Avanzadas (CICA), Universidade da Coruña, 15071, A Coruña, Spain, horacio.naveira.fachal@udc.es.
authors.forename: Horacio
authors.initials: H
authors.lastname: Naveira
authors.forename: Xabier
authors.initials: X
authors.lastname: Bello
authors.forename: José Luis
authors.initials: JL
authors.lastname: Abal-Fabeiro
authors.forename: Xulio
authors.initials: X
authors.lastname: Maside
mesh_terms: D000818:Animals; D001483:Base Sequence; D020077:Endogenous Retroviruses / Q000145:classification / Q000235:genetics*; D019143:Evolution, Molecular; D015686:Gene Products, env / Q000737:chemistry / Q000235:genetics; D015894:Genome, Human / Q000235:genetics*; D006801:Humans; D015464:Leukemia, Myelogenous, Chronic, BCR-ABL Positive / Q000235:genetics; D008958:Models, Molecular; D008969:Molecular Sequence Data; D010802:Phylogeny; D017434:Protein Structure, Tertiary; D018626:Retroelements / Q000235:genetics*; D012641:Selection, Genetic; D017422:Sequence Analysis, DNA; D012689:Sequence Homology, Nucleic Acid
chemical_list: D015686:Gene Products, env; D018626:Retroelements