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Target intelligence / Profile preview
Sperm-associated antigen 16 protein (SPAG16)
- Target
- SPAG16
- Molecular classification
- WD repeat-containing protein, Structural axonemal protein, Other (central apparatus of sperm flagellum & motile cilia)
01
Overview
Sperm-associated antigen 16 protein (SPAG16) is a structural protein essential for the formation and function of the sperm flagellum and motile cilia in eukaryotic cells[1][5]. It encodes at least two major isoforms: SPAG16L, which is integral to the axonemal central apparatus responsible for sperm motility, and SPAG16S, which localizes to nuclear speckles in male germ cells and participates in gene expression regulation during spermatogenesis[2]. Both isoforms contain seven WD repeat domains, which mediate multimeric protein interactions, facilitating their roles in cytoskeletal and gene expression complexes[4][6]. Mutations or deficiency in SPAG16 disrupt sperm motility, leading to male infertility, and are implicated in primary ciliary dyskinesia, a disorder of motile cilia function. SPAG16 is not currently recognized as a therapeutic drug target, and no approved drugs act via this protein.
- Other names
- PF20WD repeat domain 29WDR29Pf20 protein homologsperm-associated WD repeat proteinFLJ22724DKFZp666P1710
02
Mechanism of action
Not applicable, as there are no known drugs targeting SPAG16.
03
Biological functions
Sperm flagellar assembly and motilityMotile ciliogenesisRegulation of axoneme structure (central apparatus)Regulation of gene expression in germ cells (via the SPAG16S isoform)Protein-protein interactions (via WD repeat domains)
04
Disease associations
Male infertility (defects in sperm motility/spermatogenesis)Primary ciliary dyskinesiaSyndromic X-linked intellectual disability Claes-Jensen type (associated)
05
Safety considerations
Not applicable due to the absence of pharmacological targeting.
06
Interacting drugs
None identified in currently available literature or major drug databases.
07
Biomarkers
None currently established for patient selection or efficacy monitoring.
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