Abstract:
:Pds5 is required for sister chromatid cohesion, and somewhat paradoxically, to remove cohesin from chromosomes. We found that Pds5 plays a critical role during DNA replication that is distinct from its previously known functions. Loss of Pds5 hinders replication fork progression in unperturbed human and mouse cells. Inhibition of MRE11 nuclease activity restores fork progression, suggesting that Pds5 protects forks from MRE11-activity. Loss of Pds5 also leads to double-strand breaks, which are again reduced by MRE11 inhibition. The replication function of Pds5 is independent of its previously reported interaction with BRCA2. Unlike Pds5, BRCA2 protects forks from nucleolytic degradation only in the presence of genotoxic stress. Moreover, our iPOND analysis shows that the loading of Pds5 and other cohesion factors on replication forks is not affected by the BRCA2 status. Pds5 role in DNA replication is shared by the other cohesin-removal factor Wapl, but not by the cohesin complex component Rad21. Interestingly, depletion of Rad21 in a Pds5-deficient background rescues the phenotype observed upon Pds5 depletion alone. These findings support a model where loss of either component of the cohesin releasin complex perturbs cohesin dynamics on replication forks, hindering fork progression and promoting MRE11-dependent fork slowing.
journal_name
Nucleic Acids Resjournal_title
Nucleic acids researchauthors
Carvajal-Maldonado D,Byrum AK,Jackson J,Wessel S,Lemaçon D,Guitton-Sert L,Quinet A,Tirman S,Graziano S,Masson JY,Cortez D,Gonzalo S,Mosammaparast N,Vindigni Adoi
10.1093/nar/gky519subject
Has Abstractpub_date
2019-02-20 00:00:00pages
1294-1310issue
3eissn
0305-1048issn
1362-4962pii
5039657journal_volume
47pub_type
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