Transmembrane protein 232 (TMEM232)

Transmembrane protein 232 (TMEM232) is a highly conserved multi-pass transmembrane protein expressed in humans (chromosome 5, 657 amino acids) and other mammals[1][2][7]. TMEM232 is enriched in testicular tissue and plays a critical role in sperm flagellum development, male fertility, and sperm motility by regulating cytoplasm removal during spermiogenesis and maintaining the integrity of axonemal microtubules[1][2][7]. Functionally, TMEM232 interacts with Alpha Tubulin Acetyltransferase 1 (ATAT1) and multiple septin family proteins (e.g., SEPTIN 2, 4, 6, 7, 12), influencing microtubule acetylation, fine structure assembly, and annulus formation in spermatozoa. Loss of TMEM232 impairs flagellar structure (shifting the canonical 9+2 axoneme to an abnormal 8+2 structure), leads to defective sperm motility, and results in male infertility in mice[1]. TMEM232 also participates in cellular autophagy regulation, particularly affecting the elimination of cytosolic ribosomes during spermiogenesis to supply energy for flagellar movement[1]. Beyond reproduction, TMEM232 has been identified as a susceptibility gene for atopic dermatitis in some human populations, and variants are linked to failure of tooth eruption[1][2]. There is currently no evidence that TMEM232 is a direct therapeutic target (e.g., no known interacting drugs or specific mechanisms of drug action), nor are safety concerns documented. It appears to function primarily as a structural/scaffold protein essential for proper assembly and stability of specific cellular structures, particularly in sperm[1][2][7].

Other names

FLJ43080TMEM232