HFM1 (helicase for meiosis 1) is a germ cell-specific DNA helicase essential for meiotic recombination and crossover formation 1. The protein localizes to the nucleus where it facilitates resolution of meiotic recombination intermediates and ensures proper synapsis of homologous chr1 during meiosis 2. Beyond meiosis, HFM1 plays unexpected roles in early embryogenesis—nuclear localization of HFM1 is critical for zygotic genome activation, the developmental process initiating transcription in preimplantation embryos 3. HFM1 mutations cause diverse reproductive pathologies. Biallelic mutations are linked to premature ovarian failure (POI-9), with affected individuals experiencing oocyte depletion before puberty 4. In males, HFM1 defects cause non-obstructive azoospermia and severe oligozoospermia due to meiotic arrest 5. Notably, HFM1 mutations also contribute to androgenetic hydatidiform moles through defective female meiosis I 4. Functionally, HFM1 appears to regulate transcription of key meiotic genes including MSH5, MLH3, and SYCP genes 6. Clinically, whole-exome sequencing identifies HFM1 mutations in approximately 23% of genetically explained non-obstructive azoospermia cases 5. Importantly, while HFM1-deficient males produce few functional sperm, intracytoplasmic sperm injection (ICSI) can achieve favorable fertility outcomes 1, offering reproductive options despite severe meiotic defects.