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JOURNAL ARTICLE
RESEARCH SUPPORT, N.I.H., INTRAMURAL
Mouse APOBEC3 expression in NIH 3T3 cells mediates hypermutation of AKV murine leukemia virus.
Virology 2018 May
Mouse APOBEC3 (mA3) is a cytidine deaminase that can act on the single-stranded DNA reverse transcripts of retroviruses resulting in G→A hypermutation of proviral DNA. Many mA3 studies have used NIH 3T3 cells assuming that endogenous mA3 production was negligible. We developed a monoclonal antibody specific for mA3 that reveals detectable mA3 in NIH 3T3 cells and we demonstrate that AKV released from the cells undergoes G→A hypermutation. Inactivation of the mA3 gene abolished the deamination confirming that AKV hypermutation was mediated by mA3. The G→A mutations in AKV viral transcripts deviated from a normal distribution with all the mutations contained within only 20% of the transcripts. Single cell analyses revealed that the expression of mA3 in NIH 3T3 cells was limited to 20% of the cells, which likely accounted for the abnormal distribution of mutations. Endogenous NIH 3T3 mA3 was found to restrict AKV replication.
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