MND1 (meiotic nuclear divisions 1) is a conserved protein essential for homologous recombination during meiosis and DNA repair in somatic cells. In meiosis, MND1 functions as part of the Hop2-Mnd1 complex to promote proper homologous chromosome 4 and efficient crossover formation 1. Mechanistically, MND1 stimulates both DMC1- and RAD51-mediated homologous strand assimilation by binding to single-strand DNA and promoting strand exchange reactions, facilitating the resolution of meiotic double-strand breaks 2. Beyond its classical meiotic role, MND1 enables homologous recombination-mediated repair of two-ended DNA double-strand breaks in somatic cells, particularly during G2 phase, independent of replication-associated damage 3. Clinically, MND1 expression is frequently upregulated in multiple cancer types including lung adenocarcinoma, kidney renal clear cell carcinoma, and prostate cancer, where elevated levels correlate with poor overall survival 456. In prostate cancer, MND1 promotes cell proliferation by facilitating G0/G1 to S phase transition via CCNB1/p53 pathway activation 6. These findings establish MND1 as both a promising diagnostic/prognostic biomarker and potential therapeutic target for cancer management.