Three retroviral sequences in amphibians are distinct from those in mammals and birds
| Autor: | Kyle Summers, Michael Tristem, James M. Cook, Elisabeth A. Herniou |
|---|---|
| Rok vydání: | 1996 |
| Předmět: |
Amphibian
Immunology Molecular Sequence Data Microbiology Genome Birds Phylogenetics Virology Biological property biology.animal Sequence Homology Nucleic Acid Animals Humans Amino Acid Sequence Spumavirus Phylogeny Genetics Mammals biology Base Sequence Sequence Homology Amino Acid Vertebrate biology.organism_classification Retroviridae Insect Science DNA Viral Dendrobates ventrimaculatus Walleye dermal sarcoma virus Anura Research Article |
| Zdroj: | Europe PubMed Central |
| ISSN: | 0022-538X |
| Popis: | We isolated and characterized three endogenous retroviral fragments from the dart-poison frog Dendrobates ventrimaculatus. These are the first retroviral sequences to be identified in amphibians, and consequently retroviruses have now been found in each of the five major vertebrate classes. Comparison of the amphibian retroviral fragments, termed DevI, DevII, and DevIII, with mammalian and avian isolates revealed significant differences between their nucleotide sequences. This suggested that they were only distantly related to the seven currently recognized retroviral genera. Additional analysis by phylogeny reconstruction showed that the amphibian retroviral fragments were approximately equally related to the Moloney leukemia-related viruses, the spumaviruses, and walleye dermal sarcoma virus. Hybridization experiments revealed that viruses closely related to DevI, DevII, and DevIII do not appear to be widespread in other vertebrates and that DevI, DevII, and DevIII are all present at high copy numbers within their amphibian hosts, typically at over 250 copies per genome. The viruses described here, along with two others which have recently been found in a fish and a reptile, indicate that there may be some major differences in the retroviruses harbored by different vertebrate classes. This suggests that further characterization of retroviruses of fish, reptiles, and amphibians will help in understanding the evolution of the whole retroviral family and may well lead to the discovery of retroviruses with novel biological properties. |
| Databáze: | OpenAIRE |
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