Homologous recombination (HR) is one of the key pathways to repair double-strand breaks (DSBs). Rad51 serves an important function of catalysing strand exchange between two homologous sequences in the HR pathway. In higher organisms, rad51 function is indispensable with its absence leading to early embryonic lethality, thus precluding any mechanistic probing of the system. In contrast, the absence of Drosophila rad51 (spn-A/rad51) has been associated with defects in the germline, without any reported detrimental consequences to Drosophila somatic tissues. In this study, we have performed a systematic analysis of developmental defects in somatic tissues of spn-A mutant flies by using genetic complementation between multiple spn-A alleles. Our current study, for the first time, uncovers a requirement for spn-A in somatic tissue maintenance during both larval and pupal stages. Also, we show that spn-A mutant exhibits patterning defects in abdominal cuticle in the stripes and bristles, while there appear to be only subtle defects in the adult wing and eye. Interestingly, spn-A mutant shows a discernible phenotype of low temperature sensitivity, suggesting a role of spn-A in temperature sensitive cellular processes. In summary, our study describes the important role played by spn-A/rad51 in Drosophila somatic tissues.
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We acknowledge Trudi Schupbach (Princeton University) for spn-A/rad51 mutant stocks; Bhagyashree Chalke and Rudheer D Bapat from TIFR-SEM facility; Maithreyi Narasimha and Ullas Kolthur from TIFR, Trudi Schupbach (Princeton University) and Baena-Lopez LA (University of Oxford, UK) for critical inputs; Bloomington Stock Centre, Developmental Studies Hybridoma Bank, and Vienna Drosophila Resource Centre for reagents; and funding support to BJR from DAE-TIFR and JC Bose award grant (DST).
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Khan, C., Muliyil, S., Ayyub, C. et al. spn-A/rad51 mutant exhibits enhanced genomic damage, cell death and low temperature sensitivity in somatic tissues. Chromosoma (2020). https://doi.org/10.1007/s00412-020-00746-5
- DNA repair
- Homologous recombination