Sperm protein associated with the nucleus on the X chromosome N4 (SPANXN4)

SPANX family member N4 (SPANXN4) is a member of the SPANX-N subfamily of sperm nuclear-associated proteins encoded on the X chromosome[1][3][5][6]. It is specifically expressed in post-meiotic testicular cells, with highly restricted normal tissue distribution, but may be aberrantly expressed in certain tumors[1][6]. As a cancer/testis antigen, SPANXN4 is part of a group of proteins investigated as targets for cancer immunotherapy due to their selective expression profile[1][5][6]. SPANXN4 and related SPANX proteins may interact with structural nuclear elements, such as Lamin A/C, contributing to chromatin organization and post-meiotic nuclear remodeling[4][5]. Its biological role centers on spermiogenesis, and it represents a potential antigenic marker for immunotherapeutic targeting, though most current mechanistic and therapeutic research focuses on broader SPANX family members (such as SPANX-A/D)[2][5]. Targeting this antigen therapeutically requires careful attention to fertility preservation and immune specificity.

Other names

SPANXN4SPANX-N4SPANX family member N4CT11.9Nuclear-associated protein SPAN-Xn4Cancer/testis antigen family 11, member 9Sperm protein associated with the nucleus on the X chromosome N4

Immunological targeting via cancer vaccines (by eliciting T-cell responses against CTAs expressed in tumors); Not established for small molecules or other modalities for SPANXN4 specifically