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Deprecated: Implicit conversion from float 209.6 to int loses precision in C:\Inetpub\vhosts\kidney.de\httpdocs\pget.php on line 534 Nucleic+Acids+Res 2017 ; 45 (4): 1835-47 Nephropedia Template TP
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The homologous recombination protein RAD51D protects the genome from large deletions #MMPMID27924006
Reh WA; Nairn RS; Lowery MP; Vasquez KM
Nucleic Acids Res 2017[Feb]; 45 (4): 1835-47 PMID27924006show ga
Homologous recombination (HR) is a DNA double-strand break (DSB) repair pathway that protects the genome from chromosomal instability. RAD51 mediator proteins (i.e. paralogs) are critical for efficient HR in mammalian cells. However, how HR-deficient cells process DSBs is not clear. Here, we utilized a loss-of-function HR-reporter substrate to simultaneously monitor HR-mediated gene conversion and non-conservative mutation events. The assay is designed around a heteroallelic duplication of the Aprt gene at its endogenous locus in isogenic Chinese hamster ovary cell lines. We found that RAD51D-deficient cells had a reduced capacity for HR-mediated gene conversion both spontaneously and in response to I-SceI-induced DSBs. Further, RAD51D-deficiency shifted DSB repair toward highly deleterious single-strand annealing (SSA) and end-joining processes that led to the loss of large chromosomal segments surrounding site-specific DSBs at an exceptionally high frequency. Deletions in the proximity of the break were due to a non-homologous end-joining pathway, while larger deletions were processed via a SSA pathway. Overall, our data revealed that, in addition to leading to chromosomal abnormalities, RAD51D-deficiency resulted in a high frequency of deletions advancing our understanding of how a RAD51 paralog is involved in maintaining genomic stability and how its deficiency may predispose cells to tumorigenesis.