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ATR is a multifunctional regulator of male mouse meiosis
journal contributionposted on 2020-10-01, 14:40 authored by Alexander Widger, Shantha K Mahadevaiah, Julian Lange, Elias Elinati, Jasmin Zohren, Takayuki Hirota, Sarai Pacheco, Andros Maldonado-Linares, Marcello Stanzione, Obah Ojarikre, Valdone Maciulyte, Dirk G de Rooij, Attila Tóth, Ignasi Roig, Scott Keeney, James MA Turner
Meiotic cells undergo genetic exchange between homologs through programmed DNA double-strand break (DSB) formation, recombination and synapsis. In mice, the DNA damage-regulated phosphatidylinositol-3-kinase-like kinase (PIKK) ATM regulates all of these processes. However, the meiotic functions of the PIKK ATR have remained elusive, because germline-specific depletion of this kinase is challenging. Here we uncover roles for ATR in male mouse prophase I progression. ATR deletion causes chromosome axis fragmentation and germ cell elimination at mid pachynema. This elimination cannot be rescued by deletion of ATM and the third DNA damage-regulated PIKK, PRKDC, consistent with the existence of a PIKK-independent surveillance mechanism in the mammalian germline. ATR is required for synapsis, in a manner genetically dissociable from DSB formation. ATR also regulates loading of recombinases RAD51 and DMC1 to DSBs and recombination focus dynamics on synapsed and asynapsed chromosomes. Our studies reveal ATR as a critical regulator of mouse meiosis.
AnimalsAtaxia Telangiectasia Mutated ProteinsCell Cycle ProteinsChromosome PairingChromosomes, MammalianDNA Breaks, Double-StrandedIn Situ Hybridization, FluorescenceMaleMeiosisMeiotic Prophase IMice, Inbred C57BLMice, KnockoutMice, TransgenicNuclear ProteinsPhosphate-Binding ProteinsRad51 RecombinaseSpermatocytesTurner FC001193