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PMID:20617203
Citation |
Chan, SH, Yu, AM and McVey, M (2010) Dual roles for DNA polymerase theta in alternative end-joining repair of double-strand breaks in Drosophila. PLoS Genet. 6:e1001005 |
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Abstract |
DNA double-strand breaks are repaired by multiple mechanisms that are roughly grouped into the categories of homology-directed repair and non-homologous end joining. End-joining repair can be further classified as either classical non-homologous end joining, which requires DNA ligase 4, or "alternative" end joining, which does not. Alternative end joining has been associated with genomic deletions and translocations, but its molecular mechanism(s) are largely uncharacterized. Here, we report that Drosophila melanogaster DNA polymerase theta (pol theta), encoded by the mus308 gene and previously implicated in DNA interstrand crosslink repair, plays a crucial role in DNA ligase 4-independent alternative end joining. In the absence of pol theta, end joining is impaired and residual repair often creates large deletions flanking the break site. Analysis of break repair junctions from flies with mus308 separation-of-function alleles suggests that pol theta promotes the use of long microhomologies during alternative end joining and increases the likelihood of complex insertion events. Our results establish pol theta as a key protein in alternative end joining in Drosophila and suggest a potential mechanistic link between alternative end joining and interstrand crosslink repair. |
Links |
PubMed PMC2895639 Online version:10.1371/journal.pgen.1001005 |
Keywords |
Animals; DNA Breaks, Double-Stranded; DNA Repair; DNA Repair Enzymes/genetics; DNA Repair Enzymes/metabolism; Drosophila Proteins/genetics; Drosophila Proteins/metabolism; Drosophila melanogaster/enzymology; Drosophila melanogaster/genetics; Recombination, Genetic |
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Significance
Annotations
Gene product | Qualifier | GO Term | Evidence Code | with/from | Aspect | Extension | Notes | Status |
---|---|---|---|---|---|---|---|---|
DROME:DPOLQ |
involved_in |
GO:0097681: double-strand break repair via alternative nonhomologous end joining |
ECO:0000315: mutant phenotype evidence used in manual assertion |
P |
Seeded From UniProt |
complete | ||
DROME:DPOLQ |
involved_in |
GO:1901255: nucleotide-excision repair involved in interstrand cross-link repair |
ECO:0000315: mutant phenotype evidence used in manual assertion |
P |
Seeded From UniProt |
complete | ||
DROME:DPOLQ |
involved_in |
GO:0000731: DNA synthesis involved in DNA repair |
ECO:0000315: mutant phenotype evidence used in manual assertion |
P |
Seeded From UniProt |
complete | ||
See also
References
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