C14orf39 (also known as SIX6OS1) is a meiotic protein essential for proper chromosome 14 during meiotic recombination 1. The protein localizes to the central element of the synaptonemal complex (SC) and is required for SC assembly and chromosome 14 during meiosis 12. C14orf39 interacts with SYCE1 to form polycomplexes necessary for proper synapsis between homologous chr14 12. Pathogenic mutations in C14orf39 cause severe reproductive disorders including non-obstructive azoospermia in males and premature ovarian insufficiency (POI) in females 12. Homozygous mutations lead to complete or incomplete asynapsis between homologous chr14, resulting in meiotic arrest 1. Common genetic variants in C14orf39 are also associated with meiotic aneuploidy risk, highlighting its broader role in ensuring chr14 stability during meiosis 3. Clinical studies demonstrate that patients with meiotic gene defects, including C14orf39 mutations, have unsuccessful sperm retrieval rates, making genetic screening valuable for predicting treatment outcomes 4. The protein's conserved function across species underscores its fundamental importance in reproductive biology and meiotic fidelity.