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2016 ; 7
(4
): 339-45
Nephropedia Template TP
gab.com Text
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English Wikipedia
The cohesin complex prevents the end-joining of distant DNA double-strand ends in
S phase: Consequences on genome stability maintenance
#MMPMID27326661
Gelot C
; Guirouilh-Barbat J
; Lopez BS
Nucleus
2016[Jul]; 7
(4
): 339-45
PMID27326661
show ga
DNA double-strand break (DSB) repair is essential for genome stability
maintenance, but the joining of distant DNA double strand ends (DSEs) inevitably
leads to genome rearrangements. Therefore, DSB repair should be tightly
controlled to secure genome stability while allowing genetic variability.
Tethering of the proximal ends of a 2-ended DSB limits their mobility, protecting
thus against their joining with a distant DSE. However, replication stress
generates DSBs with only one DSE, on which tethering is impossible. Consistently,
we demonstrated that the joining of 2 DSBs only 3.2 kb apart is repressed in the
S, but not the G1, phase, revealing an additional mechanism limiting DNA ends
mobility in S phase. The cohesin complex, by maintaining the 2 sister chromatids
linked, limits DSEs mobility and thus represses the joining of distant DSEs,
while allowing that of adjacent DSEs. At the genome scale, the cohesin complex
protects against deletions, inversions, translocations and chromosome fusion.