The DNA repair genes XPB and XPD defend cells from retroviral infection

Proceedings of the National Academy of Sciences of the United States of America
K E YoderRichard Fishel

Abstract

Reverse transcription of retroviral RNA genomes produce a double-stranded linear cDNA molecule. A host degradation system prevents a majority of the cDNA molecules from completing the obligatory genomic integration necessary for pathogenesis. We demonstrate that the human TFIIH complex proteins XPB (ERCC3) and XPD (ERCC2) play a principal role in the degradation of retroviral cDNA. DNA repair-deficient XPB and XPD mutant cell lines exhibited an increase in transduction efficiency by both HIV- and Moloney murine leukemia virus-based retroviral vectors. Replicating Moloney murine leukemia virus viral production was greater in XPB or XPD mutant cells but not XPA mutant cells. Quantitative PCR showed an increase in total cDNA molecules, integrated provirus, and 2LTR circles in XPB and XPD mutant cells. In the presence of a reverse transcription inhibitor, the HIV cDNA appeared more stable in mutant XPB or XPD cells. These studies implicate the nuclear DNA repair proteins XPB and XPD in a cellular defense against retroviral infection.

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