We found a match
Your institution may have access to this item. Find your institution then sign in to continue.
- Title
Multiple Barriers to Nonhomologous DNA End Joining During Meiosis in Drosophila.
- Authors
Joyce, Eric F.; Paul, Anshu; Chen, Katherine E.; Tanneti, Nikhila; McKim, Kim S.
- Abstract
Repair of meiotic double-strand breaks (DSBs) uses the homolog and recombination to yield crossovers while alternative pathways such as nonhomologous end joining (NHEJ) are suppressed. Our results indicate that NHEJ is blocked at two steps of DSB repair during meiotic prophase: first by the activity of the MCM-like protein MEI-218, which is required for crossover formation, and, second, by Rad51-related proteins SPN-B (XRCC3) and SPN-D (RAD51C), which physically interact and promote homologous recombination (HR). We further show that the MCM-like proteins also promote the activity of the DSB repair checkpoint pathway, indicating an early requirement for these proteins in DSB processing. We propose that when a meiotic DSB is formed in the absence of both MEI-218 and SPN-B or SPN-D, a DSB substrate is generated that can enter the NHEJ repair pathway. Indeed, due to its high error rate, multiple barriers may have evolved to prevent NHEJ activity during meiosis.
- Subjects
MEIOSIS; INSECTS; DROSOPHILA; HOMOLOGY (Biology); PROTEINS; DNA
- Publication
Genetics, 2012, Vol 191, Issue 3, p739
- ISSN
0016-6731
- Publication type
Article
- DOI
10.1534/genetics.112.140996