cGAS suppresses genomic instability as a decelerator of replication forks.

Abstract:

:The cyclic GMP-AMP synthase (cGAS), a sensor of cytosolic DNA, is critical for the innate immune response. Here, we show that loss of cGAS in untransformed and cancer cells results in uncontrolled DNA replication, hyperproliferation, and genomic instability. While the majority of cGAS is cytoplasmic, a fraction of cGAS associates with chromatin. cGAS interacts with replication fork proteins in a DNA binding-dependent manner, suggesting that cGAS encounters replication forks in DNA. Independent of cGAMP and STING, cGAS slows replication forks by binding to DNA in the nucleus. In the absence of cGAS, replication forks are accelerated, but fork stability is compromised. Consequently, cGAS-deficient cells are exposed to replication stress and become increasingly sensitive to radiation and chemotherapy. Thus, by acting as a decelerator of DNA replication forks, cGAS controls replication dynamics and suppresses replication-associated DNA damage, suggesting that cGAS is an attractive target for exploiting the genomic instability of cancer cells.

journal_name

Sci Adv

journal_title

Science advances

authors

Chen H,Chen H,Zhang J,Wang Y,Simoneau A,Yang H,Levine AS,Zou L,Chen Z,Lan L

doi

10.1126/sciadv.abb8941

subject

Has Abstract

pub_date

2020-10-14 00:00:00

issue

42

issn

2375-2548

pii

6/42/eabb8941

journal_volume

6

pub_type

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