TDRD6 (tudor domain containing 6) is an essential germ cell protein that functions in spermatogenesis through multiple interconnected mechanisms. Structurally, TDRD6 localizes to chr6 bodies, cytoplasmic ribonucleoprotein granules critical for male germ cell development 1. The protein orchestrates chr6 body assembly by interacting with core components including TDRD7, MAEL, PCBP1, DDX4, and PIWIL1, with proper localization required for UPF1 positioning and NMD pathway function 12. TDRD6 mediates RNA processing through interaction with PRMT5 and arginine-methylated SNRPB, supporting spliceosome maturation and mRNA splicing in spermatocytes 3. Clinically, bi-allelic TDRD6 loss-of-function variants cause severe oligoasthenoteratozoospermia (OAT)—characterized by low sperm concentration, reduced motility, and morphological abnormalities including acrosomal hypoplasia 13. TDRD6 mutations additionally cause oocyte activation deficiency, resulting in early embryonic arrest that is reversible through artificial oocyte activation 4. Mechanistically, TDRD6 deficiency disrupts chr6 body architecture in round spermatids, blocks spermatogenesis progression, and dysregulates mRNA metabolism processes essential for spermatid differentiation 13. TDRD6 serves as a genetic diagnostic target for male infertility, though intracytoplasmic sperm injection outcomes are unfavorable in affected individuals 3.