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Target intelligence / Profile preview
Sperm-associated antigen 6 (SPAG6)
- Target
- SPAG6
- Molecular classification
- Other (axoneme central apparatus protein, structural protein), Armadillo repeat-containing (ARMC) protein family, Cilia and flagella central apparatus protein, Microtubule-associated protein
01
Overview
Sperm-associated antigen 6 (SPAG6) is a structural protein that localizes to the central apparatus of the axoneme in cilia and flagella, especially in sperm tails. It contains eight contiguous armadillo repeats that mediate protein-protein interactions critical for cilia and flagellar architecture and motility. In mammals, SPAG6 is essential for proper formation, alignment, and function of motile cilia and sperm flagella, thus playing a crucial role in fertility and in maintaining respiratory, neurological, and reproductive health. Mutations or dysregulation in SPAG6 can result in a spectrum of ciliary dysfunctions, such as primary ciliary dyskinesia, infertility, hydrocephalus, and potential hearing and neuronal defects. Antibodies against SPAG6 are implicated in immunologic infertility, making this antigen a candidate for diagnostic or contraceptive research.
- Other names
- PF16Repro-SA-1CT141FAP194CFAP194Sperm flagellar proteinAxoneme central apparatus proteinProtein PF16 homologTesticular tissue protein Li 176
02
Mechanism of action
Not applicable; as no drugs are described to directly target SPAG6, but antibodies may block fertilization by targeting sperm-associated antigens
03
Biological functions
Regulation of cilia/flagellar motilityMaintenance of structural integrity of sperm flagellaCiliogenesis (formation of cilia)Cell polarity in epithelial tissuesProtein-protein interactions via armadillo repeatsSperm function and fertilityNeuronal development and functionFibroblast cell proliferation, morphology, migration
04
Disease associations
Infertility (especially male infertility due to sperm motility defects)Primary ciliary dyskinesiaHydrocephalus (in mouse models)Otitis media (predisposition due to ciliary defects)TympanosclerosisPotential role in neuronal disorders via cilia dysfunction
05
Safety considerations
Targeting SPAG6 could potentially impair fertility (especially male fertility)Targeting structural ciliary proteins could affect multiple organs reliant on motile cilia (e.g., airways, brain, reproductive tract), raising concerns for off-target effects in therapeutic settingsNo established safety profile as a therapeutic target
06
Biomarkers
Anti-sperm antibodies recognizing SPAG6 (used in diagnosis for immunologic infertility)Possible exploration as markers for ciliary disorders and sperm motility defects
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