Cell cycle checkpoint protein RAD1 is a protein that in humans is encoded by the RAD1gene.[5][6][7]
Function
This gene encodes a component of a heterotrimeric cell cycle checkpoint complex, known as the 9-1-1 complex, that is activated to stop cell cycle progression in response to DNA damage or incomplete DNA replication. The 9-1-1 complex is recruited by RAD17 to affected sites where it may attract specialized DNA polymerases and other DNA repair effectors. Alternatively spliced transcript variants encoding different isoforms of this gene have been described.[7]
Meiosis
During meiosis, double-strand breaks occur in DNA that initiate recombination. Recombination is a process that repairs the breaks and also promotes faithful chromosome segregation.[8] In yeast the 9-1-1 complex (including RAD1) facilitates meiotic recombination. An alternative, but inaccurate, mechanism for repairing double-strand breaks is non-homologous end joining. In the rice plant, the 9-1-1 complex promotes accurate meiotic recombination by suppressing the alternative process of non-homologous end joining.[8]
During mammalian meiosis 9-1-1 complexes promote synapsis of homologous chromosomes.[9] Testis-specific disruption of RAD1 in mice results in defective double-strand break repair, depletion of germ cells and infertility.[9]
^Bluyssen HA, van Os RI, Naus NC, Jaspers I, Hoeijmakers JH, de Klein A (January 1999). "A human and mouse homolog of the Schizosaccharomyces pombe rad1+ cell cycle checkpoint control gene". Genomics. 54 (2): 331–7. doi:10.1006/geno.1998.5582. PMID9828137.
^Hang H, Zhang Y, Dunbrack RL, Wang C, Lieberman HB (April 2002). "Identification and characterization of a paralog of human cell cycle checkpoint gene HUS1". Genomics. 79 (4): 487–92. doi:10.1006/geno.2002.6737. PMID11944979.
^Bao S, Tibbetts RS, Brumbaugh KM, Fang Y, Richardson DA, Ali A, Chen SM, Abraham RT, Wang XF (June 2001). "ATR/ATM-mediated phosphorylation of human Rad17 is required for genotoxic stress responses". Nature. 411 (6840): 969–74. doi:10.1038/35082110. PMID11418864. S2CID4429058.
^Dufault VM, Oestreich AJ, Vroman BT, Karnitz LM (Dec 2003). "Identification and characterization of RAD9B, a paralog of the RAD9 checkpoint gene". Genomics. 82 (6): 644–51. doi:10.1016/s0888-7543(03)00200-3. PMID14611806.
Bardwell AJ, Bardwell L, Johnson DK, Friedberg EC (1993). "Yeast DNA recombination and repair proteins Rad1 and Rad10 constitute a complex in vivo mediated by localized hydrophobic domains". Mol. Microbiol. 8 (6): 1177–88. doi:10.1111/j.1365-2958.1993.tb01662.x. PMID8361362. S2CID45135386.
Dean FB, Lian L, O'Donnell M (1999). "cDNA cloning and gene mapping of human homologs for Schizosaccharomyces pombe rad17, rad1, and hus1 and cloning of homologs from mouse, Caenorhabditis elegans, and Drosophila melanogaster". Genomics. 54 (3): 424–36. doi:10.1006/geno.1998.5587. PMID9878245.
Bao S, Tibbetts RS, Brumbaugh KM, Fang Y, Richardson DA, Ali A, Chen SM, Abraham RT, Wang XF (2001). "ATR/ATM-mediated phosphorylation of human Rad17 is required for genotoxic stress responses". Nature. 411 (6840): 969–74. doi:10.1038/35082110. PMID11418864. S2CID4429058.
Hang H, Zhang Y, Dunbrack RL, Wang C, Lieberman HB (2002). "Identification and characterization of a paralog of human cell cycle checkpoint gene HUS1". Genomics. 79 (4): 487–92. doi:10.1006/geno.2002.6737. PMID11944979.