Testis Specific Protein, Y-Linked 3 (TSPY3)

TSPY3 Belongs to the nucleosome assembly protein (NAP) family.Specifically expressed in testicular tissues. Isoform 1 and isoform 2 are expressed in spermatogonia and spermatocytes. Found in early testicular carcinoma in situ, spermatogonial cells in testicular tissues of 46,X,Y female and in prostate cancer cell lines.

Variants Val-Glu-Val-Val-Ala-Glu-79 Ins and Arg-195 are shown to be present in a number of TSPY1 copies of the Yp11 loci. Variant Arg-195 is shown to be present at least in one TSPY1 copy of the Yq locus.Maps to a tandemly repeated region on chromosome Yp11; additionally at least one copy is reported originating from Yq. The gene is thought to be present with an inter-individual variation in copy number and between 20 and 60 copies per Y chromosome are expected.