Dataset Information

Interclass transmission and phyletic host tracking in murine leukemia virus-related retroviruses.

ABSTRACT: Retroviruses are capable of infectious horizontal transmission between hosts, usually between individuals within a single species, although a number of probable zoonotic infections resulting from transmission between different species of placental mammals have also been reported. Despite these data, it remains unclear how often interspecies transmission events occur or whether their frequency is influenced by the evolutionary distance between host taxa. To address this problem we used PCR to amplify and characterize endogenous retroviruses related to the murine leukemia viruses. We show that members of this retroviral genus are harbored by considerably more organisms than previously thought and that phylogenetic analysis demonstrates that viruses isolated from a particular host class generally cluster together, suggesting that infectious virus horizontal transfer between vertebrate classes occurs only rarely. However, two recent instances of transmission of zoonotic infections between distantly related host organisms were identified. One, from mammals to birds, has led to a rapid adaptive radiation into other avian hosts. The other, between placental and marsupial mammals, involves viruses clustering with recently described porcine retroviruses, adding to concerns regarding the xenotransplantation of pig organs to humans.

SUBMITTER: Martin J

PROVIDER: S-EPMC104491 | biostudies-literature | 1999 Mar

REPOSITORIES: biostudies-literature

ACCESS DATA

Publications

Interclass transmission and phyletic host tracking in murine leukemia virus-related retroviruses.

Martin J J Herniou E E Cook J J O'Neill R W RW Tristem M M

Journal of virology 19990301 3

Retroviruses are capable of infectious horizontal transmission between hosts, usually between individuals within a single species, although a number of probable zoonotic infections resulting from transmission between different species of placental mammals have also been reported. Despite these data, it remains unclear how often interspecies transmission events occur or whether their frequency is influenced by the evolutionary distance between host taxa. To address this problem we used PCR to amp ...[more]

PMID: 9971829

Similar Datasets

Project description:BackgroundOne of the unique features of gammaretroviruses is that they contain an additional extended form of Gag, glyco-gag, which initiates in the leader sequence. MuLV glyco-gag, gPr80Gag, promotes retrovirus replication and disease progression. Although virtually all infectious MuLVs encode glyco-gag, XMRV (xenotropic murine leukemia virus-related virus) lacks the classical gPr80Gag sequence. We examined XMRV to determine if its leader sequence contains glyco-gag activity, whether the presence of conventional gPr80Gag affects replication of XMRV, and we describe the evolution of glyco-gag-deficient MuLVs in Mus.ResultsWe introduced several mutations disrupting two putative but noncanonical glyco-gag proteins in the leader sequence region in XMRV and found that those mutations did not affect virus release nor susceptibility to the antiviral activity of hA3G (human APOBEC3G). A chimeric XMRV encoding the Moloney MuLV (M-MuLV) leader sequence (MXMRV) demonstrated that M-MuLV glyco-gag facilitated MXMRV release and increased infectivity. Infectivity assays with several cell lines showed that glyco-gag increases XMRV infectivity in all cell lines tested, but the level of this increase varies in different cell lines. Because MuLV glyco-gag counteracts mouse APOBEC3, we investigated whether M-MuLV glyco-gag enhances XMRV infection by counteracting human APOBEC3. Comparison of hAPOBEC3 isoforms expressed in different cell lines indicated that hA3B was the most likely candidate for a restrictive hA3. However over-expression of hA3B showed no enhanced restriction of infection by XMRV compared to MXMRV. Endogenous MuLVs in the sequenced mouse genome were screened for canonical glyco-gag, which was identified in two clades of xenotropic MuLVs (X-MuLVs) and ecotropic MuLVs, but not in other X-MuLVs or in any polytropic MuLVs.ConclusionsM-MuLV glyco-gag facilitates XMRV replication, and the leader sequence region in XMRV does not encode proteins equivalent to M-MuLV glyco-gag. The fact that the ability of glyco-gag to enhance XMRV infection varies in different cell lines suggests a glyco-gag sensitive restrictive factor that further reduces XMRV infectivity. The M-MuLV glyco-gag enhancement for XMRV replication is through a hAPOBEC3 independent mechanism. The absence of glyco-gag in MuLVs carried by western European mice suggests that loss of this sequence is a relatively recent event with limited subspecies distribution.

Dataset Information

Interclass transmission and phyletic host tracking in murine leukemia virus-related retroviruses.

Publications

Interclass transmission and phyletic host tracking in murine leukemia virus-related retroviruses.

Similar Datasets

OmicsDI is part of the ELIXIR infrastructure

Tweets