53BP1 nuclear bodies enforce replication timing at under-replicated DNA to limit heritable DNA damage

Nature Cell Biology
Julian SpiesKai John Neelsen

Abstract

Failure to complete DNA replication is a stochastic by-product of genome doubling in almost every cell cycle. During mitosis, under-replicated DNA (UR-DNA) is converted into DNA lesions, which are inherited by daughter cells and sequestered in 53BP1 nuclear bodies (53BP1-NBs). The fate of such cells remains unknown. Here, we show that the formation of 53BP1-NBs interrupts the chain of iterative damage intrinsically embedded in UR-DNA. Unlike clastogen-induced 53BP1 foci that are repaired throughout interphase, 53BP1-NBs restrain replication of the embedded genomic loci until late S phase, thus enabling the dedicated RAD52-mediated repair of UR-DNA lesions. The absence or malfunction of 53BP1-NBs causes premature replication of the affected loci, accompanied by genotoxic RAD51-mediated recombination. Thus, through adjusting replication timing and repair pathway choice at under-replicated loci, 53BP1-NBs enable the completion of genome duplication of inherited UR-DNA and prevent the conversion of stochastic under-replications into genome instability.

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Methods Mentioned

BETA
dissection
confocal microscopy
X-ray
transfection

Software Mentioned

GraphPad Prism
ScanR
MiDAS
Matlab
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Olympus
Imaris

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