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Endogenous retroviruses are the traces of ancient infections of host germline cells, thereby providing the primary tools for investigating host and viral evolution. EnJSRVs stand for "endome and pathogenic Jaagsiekte sheep retrovirus" and have been found in the genome of domestic sheep. At least twenty-seven copies of ERVs related to the exogenous and pathogenic Jaagsiekte sheep retrovirus are present on the genome, which are also known as enJSRVs. We extend the cytogenetic physical records of sheep and river buffalo by doing fluorescent in situ hybridization mapping of twenty-three genetically identified enJSRVs in this report. Also, we present the first comparative FISH mapping of enJSRVs in domestic sheep and river buffalo.
Source link: https://europepmc.org/article/MED/36290220
Both ancient non-orthologous ERV genes, ARTenvV and CARenvV, are preserved in mammalian orders Artiodactyla and Carnivora, respectively, but are not present in other mammals. ARTenvV and CARenvV were derived from an ancient ancestral exogenous gamma-like retrovirus that was solely endogenized in two mammalian orders more than 60 years ago, roughly matches with the K-Pg mass extinction event and subsequent mammalian diversification. These findings also established the first identification of the convergent co-ordinal transmission of a gamma-like retrovirus in two distinct mammalian orders, as well as the first finding of the first detection of convergent co-ordinal transmission of an ERV gene derived from the same ancestral retrovirus in two different mammalian orders.
Source link: https://europepmc.org/article/MED/36240227
Endogenous retroviruses are inherited fragments of retroviruses that colonized host germline over millions of years, providing a snapshot of retrovirus variation across time. We explore the prevalence and timing of retrovirus-host interactions in hosts undergoing adaptive radiation and colonization of new environments by mapping ERV variations among all species of Darwin's finches and comparing with outgroup species. The rapid speciation of Darwin's finches suggests a connection between ERV accumulation and Darwin's finches that occurs among chromosomes and various finch species.
Source link: https://europepmc.org/article/MED/36229469
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