MRE11-dependent instability in mitochondrial DNA fork protection activates a cGAS immune signaling pathway.
MRE11-dependent instability in mitochondrial DNA fork protection activates a cGAS immune signaling pathway.
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DOI:
10.1126/sciadv.abf9441
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发表时间:
2021-12-17
期刊:
影响因子:
13.6
通讯作者:
Schlacher K
中科院分区:
文献类型:
--
作者:
Luzwick JW;Dombi E;Boisvert RA;Roy S;Park S;Kunnimalaiyaan S;Goffart S;Schindler D;Schlacher K
MRE11 activates mitochondrial DNA–dependent cGAS immune signaling in cells with BRCA/FANC gene defects. Mitochondrial DNA (mtDNA) instability activates cGAS-dependent innate immune signaling by unknown mechanisms. Here, we find that Fanconi anemia suppressor genes are acting in the mitochondria to protect mtDNA replication forks from instability. Specifically, Fanconi anemia patient cells show a loss of nascent mtDNA through MRE11 nuclease degradation. In contrast to DNA replication fork stability, which requires pathway activation by FANCD2-FANCI monoubiquitination and upstream FANC core complex genes, mitochondrial replication fork protection does not, revealing a mechanistic and genetic separation between mitochondrial and nuclear genome stability pathways. The degraded mtDNA causes hyperactivation of cGAS-dependent immune signaling resembling the unphosphorylated ISG3 response. Chemical inhibition of MRE11 suppresses this innate immune signaling, identifying MRE11 as a nuclease responsible for activating the mtDNA-dependent cGAS/STING response. Collective results establish a previously unknown molecular pathway for mtDNA replication stability and reveal a molecular handle to control mtDNA-dependent cGAS activation by inhibiting MRE11 nuclease.
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