Involved in and required for double-strand break repair by meiotic and mitotic homologous recombination. During meiosis, has a dual role in the repair of meiotic double-stranded breaks and the efficient activation of the meiotic recombination checkpoint. Interacts with Rad9 (PubMed:18266476). Interacts with spn-A/Rad51 (PubMed:17822964). Interacts with cyclin CycG (PubMed:22976300). Brca2 and spn-A/Rad51 become recruited to nuclear foci after DNA damage. Induced sensitivity to DNA damage induced by irradiation or treatment with hydroxyurea/ Repair by homologous recombination is dramatically decreased. Instead, large flanking deletions are formed, and repair by the non-conservative single-strand annealing pathway predominates.