Required for proper homologous chromosome pairing and efficient cross-over and intragenic recombination during meiosis. Stimulates both DMC1- and RAD51-mediated homologous strand assimilation, which is required for the resolution of meiotic double-strand breaks (By similarity). Heterodimer with PSMC3IP/HOP2. MND1-PSMC3IP interacts with DMC1 and RAD51 and binds preferentially to dsDNA (By similarity). Belongs to the MND1 family.