Participates in meiotic recombination, specifically in homologous strand assimilation, which is required for the resolution of meiotic double-strand breaks. Double stacked ring-shaped homooctamer (PubMed:15125839). Interacts with BRCA2 (PubMed:20729832). Interacts with the MND1-PSMC3IP heterodimer (By similarity). Interacts with RAD51AP1; the interaction is direct and stimulates DMC1-mediated homologous recombination (PubMed:21307306, PubMed:21903585). Belongs to the RecA family. DMC1 subfamily.