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J. Virol., 02 1996, 887-897, Vol 70, No. 2
DF Purcell, CM Broscius, EF Vanin, CE Buckler, AW Nienhuis and MA Martin
Direct RNA-PCR analyses of T-cell lymphomas that developed in rhesus
macaques during a gene transfer experiment revealed the presence of several
different recombinant murine leukemia viruses (MuLV). Most prominent was
the expected MuLV recombinant, designated MoLTRAmphoenv in which the
amphotropic env of the helper packaging virus was joined to the long
terminal repeat (LTR) of the Moloney MuLV-derived vector. This retrovirus
does not exist in nature. An additional copy of the core enhancer acquired
from the vector LTR may have augmented the replicative properties of
MoLTRAmphoenv MuLV in several different rhesus cell types compared with the
prototype amphotropic MuLV4070A. Unexpectedly, at least two types of mink
cell focus-forming MuLV elements, arising from endogenous retroviral
sequences expressed in the murine packaging cell line, were also
transmitted and highly expressed in one of the macaques. Furthermore,
murine virus-like VL-30 sequences were detected in the rhesus lymphomas,
but these were not transcribed into RNA. The unanticipated presence of an
array of MuLV-related structures in a primate gene transfer recipient
demands ever-vigilant scrutiny for the existence of transmissible
retroviral elements and replication-competent viruses possessing altered
tropic or growth properties in packaging cells producing retroviral
vectors.
Copyright © 1996, American Society for Microbiology
An array of murine leukemia virus-related elements is transmitted and expressed in a primate recipient of retroviral gene transfer
Laboratory of Molecular Microbiology, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Bethesda, MD 20892, USA.
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