MAK

Male germ cell-associated kinase (MAK) is a serine/threonine protein kinase belonging to the MAK/ICK/MOK kinase family and functions as a regulator of ciliary structure and cellular signaling pathways^[1][2]. MAK is localized to ciliary compartments and is required for the regulation of ciliary length, ciliogenesis, and long-term photoreceptor survival, establishing its central role in cilium-dependent cellular homeostasis^[2][3][4]. Mechanistically, MAK participates in ciliary transport processes and regulates axoneme development, a critical step during ciliogenesis that supports intracellular trafficking within specialized sensory cells^[3][4]. In experimental models, loss of MAK function disrupts photoreceptor cilia, impairs outer segment formation, and promotes photoreceptor degeneration, linking defective ciliary regulation to retinal disease pathogenesis^[4][5]. Human genetic studies further demonstrate that MAK mutations are associated with autosomal recessive retinitis pigmentosa, highlighting the clinical relevance of this kinase in inherited retinal degeneration^[5]. Compared with related family members such as ICK and MOK, MAK shares a conserved serine/threonine kinase domain but exhibits distinct biological functions in photoreceptor cilia and tissue-specific regulation, indicating functional diversification within the kinase family^[4]. Although MAK is also reported to act as an androgen receptor coactivator in prostate cancer cells, its best-characterized function remains the control of ciliary biology and photoreceptor integrity^[1][4]. Currently, selective MAK-targeted pharmacological modulators remain limited, and genetic and disease-model approaches therefore continue to serve as the primary tools for mechanistic investigation of MAK signaling and ciliopathy-related phenotypes^[3][4].