A single-amino-acid substitution in the TvbS1 receptor results in decreased susceptibility to infection by avian sarcoma and leukosis virus subgroups B and D and resistance to infection by subgroup E in vitro and in vivo

Markéta Reinišová, Filip Šenigl, Xueqian Yin, Jiří Plachý, Josef Geryk, Daniel Elleder, Jan Svoboda, Mark J. Federspiel, Jiří Hejnar

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21 Scopus citations


The avian sarcoma and leukosis virus (ASLV) family of retroviruses contains five nighty related envelope subgroups (A to E) thought to have evofved from a common viral ancestor in the chicken population. Three genetic foci in chickens determine the susceptibility or resistance of cells to infection by the subgroup A to E ASLVs. Some inbred lines of chickens display phenotypes that are somewhere in between either efficiently susceptible or resistant to infection by specific subgroups of ASLV. The tvb gene encodes the receptor for subgroups B, D, and E ASLVs. The wild-type TvbS1 receptor confers susceptibility to subgroups B, D, and E ASLVs. In this study, the genetic defect that accounts for the altered susceptibility of an inbred chicken line, line M, to infection by ASLV(B), ASLV(D), and ASLV(E) was identified. The tvb gene in fine M, tvbr2, encodes a mutant TvbS1 receptor protein with a substitution of a serine for a cysteine at position 125 (C125S). Here, we show that the C125S substitution in TvbS1 significantiy reduces the susceptibility of line M cells to infection by ASLV(B) and ASLV(D) and virtually eliminates susceptibility to ASLV(E) infection both in cultured cells and in the incidence and growth of avian sarcoma virus-induced sarcomas in chickens. The C125S substitution significantiy reduces the binding affinity of the TvbS1 receptor for the subgroup B, D, and E ASLV envelope glycoproteins. These are the first results that demonstrate a possible role of the cysteine-rich domain 3 in the function of the Tvb receptors.

Original languageEnglish (US)
Pages (from-to)2097-2105
Number of pages9
JournalJournal of virology
Issue number5
StatePublished - Mar 1 2008


ASJC Scopus subject areas

  • Microbiology
  • Immunology
  • Insect Science
  • Virology

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