MCM8-9 complex promotes resection of double-strand break ends by MRE11-RAD50-NBS1 complex.
basic_science · Level V
Where this comes from
- Record sourced from PubMed, PMID 26215093.
- Also identified by DOI 10.1038/ncomms8744 and PMC identifier 4525285.
- Licence recorded as CC BY.
- The licence permits redistribution, so the abstract is shown in full and the full text is available from the publisher.
Abstract
MCM8-9 complex is required for homologous recombination (HR)-mediated repair of double-strand breaks (DSBs). Here we report that MCM8-9 is required for DNA resection by MRN (MRE11-RAD50-NBS1) at DSBs to generate ssDNA. MCM8-9 interacts with MRN and is required for the nuclease activity and stable association of MRN with DSBs. The ATPase motifs of MCM8-9 are required for recruitment of MRE11 to foci of DNA damage. Homozygous deletion of the MCM9 found in various cancers sensitizes a cancer cell line to interstrand-crosslinking (ICL) agents. A cancer-derived point mutation or an SNP on MCM8 associated with premature ovarian failure (POF) diminishes the functional activity of MCM8. Therefore, the MCM8-9 complex facilitates DNA resection by the MRN complex during HR repair, genetic or epigenetic inactivation of MCM8 or MCM9 are seen in human cancers, and genetic inactivation of MCM8 may be the basis of a POF syndrome.
Medical subject headings
- Cell Cycle Proteins
- DNA Breaks, Double-Stranded
- DNA Repair Enzymes
- DNA-Binding Proteins
- Minichromosome Maintenance Proteins
- Nuclear Proteins