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TEX101, a germ cell-specific glycosyl-phosphatidylinositol (GPI)-anchored glycoprotein, is associated with Ly6k during spermatogenesis in testis. Although both  Tex101   −/−   and  Ly6k   −/−   mice can produce morphologically intact spermatozoa, both knockout mice show an infertile phenotype due to a disorder of spermatozoa to migrate into the oviduct. Since Ly6k specifically interacts with TEX101, complex formation of TEX101/Ly6k appears to be potentially important for functional sperm production. This study evaluated the fate of Ly6k in the presence or absence of TEX101 to explore the molecular interaction of both GPI-anchored proteins in seminiferous tubules. The present study showed that: 1) Although  Ly6k  mRNA was detected, the protein was present at very low levels in mature testes of  Tex101   −/−   mice, 2)  Ly6k  mRNA level was within the normal range in  Tex101   −/−   mice, 3)  Ly6k  mRNA was translated into a polypeptide in the testes of  Tex101  +/+  and  Tex101   −/−   mice, and 4) TEX101, as well as Ly6k, are co-factors that affect to molecular expression. These results indicate that both TEX101 and Ly6k contribute to the post-translational counterpart protein expression at the cell membrane. This mechanism may be important in maintaining the production of fertile spermatozoa during spermatogenesis.

TEX101, a glycoprotein essential for sperm fertility, is required for stable expression of Ly6k on testicular germ cells