KLHDC9 Gene: Function, Location, and Disease Associations | Biomedical SEO

KLHDC9 (Kelch domain containing 9) is a protein-coding gene located on chromosome 1q32.1. It encodes a protein belonging to the BTB-kelch family, characterized by a BTB/POZ domain and multiple kelch repeats. The protein is predicted to function as a substrate adaptor for Cullin-RING E3 ubiquitin ligases, potentially involved in ubiquitination and protein degradation. KLHDC9 is expressed in various tissues, with notable levels in the brain and testis. Its exact physiological roles and disease associations are still under investigation, but emerging evidence suggests involvement in cellular processes such as cell cycle regulation and stress response.

Tissue Expression

Cell Line Expression

Hotspot Mutations

Mutation functional classification

• Cullin-RING ubiquitin ligase pathway (predicted)

• Ubiquitin-proteasome system (predicted)

The KLHDC9 protein is a 399-amino acid polypeptide with a predicted molecular weight of ~45 kDa. It contains an N-terminal BTB/POZ domain and six C-terminal kelch repeats, which are typical of BTB-kelch proteins. The BTB domain mediates protein-protein interactions and dimerization, while kelch repeats form a beta-propeller structure that can bind to substrates. KLHDC9 is predicted to act as a substrate adaptor for Cullin-RING E3 ligases, targeting specific proteins for ubiquitination and proteasomal degradation. Its expression in brain and testis suggests roles in neuronal and reproductive functions, but experimental validation is needed.