Super-resolution imaging of RAD51 and DMC1 in DNA repair foci reveals dynamic distribution patterns in meiotic prophase

Autoři: Johan A. Slotman aff001;  Maarten W. Paul aff001;  Fabrizia Carofiglio aff003;  H. Martijn de Gruiter aff001;  Tessa Vergroesen aff003;  Lieke Koornneef aff003;  Wiggert A. van Cappellen aff001;  Adriaan B. Houtsmuller aff001;  Willy M. Baarends aff003
Působiště autorů: Erasmus Optical Imaging Centre, Department of Pathology, Erasmus MC—University Medical Center, Rotterdam, The Netherlands aff001;  Department of Pathology, Erasmus MC—University Medical Center, Rotterdam, The Netherlands aff002;  Department of Developmental Biology, Erasmus MC—University Medical Center, Rotterdam, The Netherlands aff003
Vyšlo v časopise: Super-resolution imaging of RAD51 and DMC1 in DNA repair foci reveals dynamic distribution patterns in meiotic prophase. PLoS Genet 16(6): e32767. doi:10.1371/journal.pgen.1008595
Kategorie: Research Article
doi: 10.1371/journal.pgen.1008595


The recombinase RAD51, and its meiosis-specific paralog DMC1 localize at DNA double-strand break (DSB) sites in meiotic prophase. While both proteins are required during meiotic prophase, their spatial organization during meiotic DSB repair is not fully understood. Using super-resolution microscopy on mouse spermatocyte nuclei, we aimed to define their relative position at DSB foci, and how these vary in time. We show that a large fraction of meiotic DSB repair foci (38%) consisted of a single RAD51 nanofocus and a single DMC1 nanofocus (D1R1 configuration) that were partially overlapping with each other (average center-center distance around 70 nm). The vast majority of the rest of the foci had a similar large RAD51 and DMC1 nanofocus, but in combination with additional smaller nanofoci (D2R1, D1R2, D2R2, or DxRy configuration) at an average distance of around 250 nm. As prophase progressed, less D1R1 and more D2R1 foci were observed, where the large RAD51 nanofocus in the D2R1 foci elongated and gradually oriented towards the distant small DMC1 nanofocus. D1R2 foci frequency was relatively constant, and the single DMC1 nanofocus did not elongate, but was frequently observed between the two RAD51 nanofoci in early stages. D2R2 foci were rare (<10%) and nearest neighbour analyses also did not reveal cofoci formation between D1R1 foci. However, overall, foci localized nonrandomly along the SC, and the frequency of the distance distributions peaked at 800 nm, indicating interference and/or a preferred distance between two ends of a DSB. DMC1 nanofoci where somewhat further away from the axial or lateral elements of the synaptonemal complex (SC, connecting the chromosomal axes of homologs) compared to RAD51 nanofoci. In the absence of the transverse filament of the SC, early configurations were more prominent, and RAD51 nanofocus elongation occurred only transiently. This in-depth analysis of single cell landscapes of RAD51 and DMC1 accumulation patterns at DSB repair sites at super-resolution revealed the variability of foci composition, and defined functional consensus configurations that change over time.

Klíčová slova:

Built structures – DNA repair – Homologous chromosomes – Meiotic prophase – Recombinant proteins – Simulation and modeling – Spermatocytes – Prophase


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