Expression pattern analysis of transcribed HERV sequences is complicated by ex vivo recombination

Summary, in English

Background: The human genome comprises numerous human endogenous retroviruses ( HERVs) that formed millions of years ago in ancestral species. A number of loci of the HERV-K(HML-2) family are evolutionarily much younger. A recent study suggested an infectious HERV-K(HML-2) variant in humans and other primates. Isolating such a varian t from human individuals would be a significant finding for human biology. Results: When investigating expression patterns of specific HML-2 proviruses we encountered HERV-K(HML-2) cDNA sequences without proviral homologues in the human genome, named HERV-KX, that could very well support recently suggested infectious HML-2 variants. However, detailed sequence analysis, using the software RECCO, suggested that HERV-KX sequences were produced by recombination, possibly arising ex vivo, between transcripts from different HML-2 proviral loci. Conclusion: As RT-PCR probably will be instrumental for isolating an infectious HERV-K(HML2) variant, generation of "new" HERV-K(HML-2) sequences by ex vivo recombination seems inevitable. Further complicated by an unknown amount of allelic sequence variation in HERV-K(HML-2) proviruses, newly identified HERV-K(HML-2) variants should be interpreted very cautiously.

• Författare: Aline Flockerzi; Jochen Maydt; Oliver Frank; Alessia Ruggieri; Esther Maldener; Wolfgang Seifarth; Patrik Medstrand; Thomas Lengauer; Andreas Meyerhans; Christine Leib-Moesch; Eckart Meese; Jens Mayer
• Avdelning/ar: Institutionen för experimentell medicinsk vetenskap
• Publiceringsår: 2007
• Språk: Engelska
• Publikation/Tidskrift/Serie: Retrovirology
• Volym: 4
• Länkar: http://dx.doi.org/10.1186/1742-4690-4-39
• Dokumenttyp: Artikel i tidskrift
• Förlag: BioMed Central (BMC)
• Ämne: Pharmacology and Toxicology
• Status: Published
• ISBN/ISSN/Övrigt: ISSN: 1742-4690