Wolframin

Wolframin (WFS1) is a 890-amino-acid endoplasmic reticulum (ER) protein that regulates cellular calcium homeostasis by modulating ER Ca²⁺ store filling and negatively regulating the ER stress response (UniProt: O76024). It also stabilizes V-ATPase subunits ATP6V1A and ATP6V1B1 through a proteasome-independent mechanism, preventing their degradation. This protein is primarily associated with Wolfram syndrome, a rare disorder featuring juvenile-onset diabetes mellitus, optic atrophy, and neurological complications including dementia.

Beyond Wolfram syndrome, WFS1 mutations cause autosomal dominant non-syndromic hearing loss (DFNA6), Wolfram-like syndrome with hearing impairment and optic atrophy, and cataracts (UniProt: O76024). Given its ER stress regulation function and involvement in progressive neurological dysfunction in genetic disorders, WFS1 is relevant to neurodegenerative contexts.

WFS1 is upregulated in Alzheimer's disease brain tissue (mean log2 fold-change +0.61) in post-mortem AD versus age-matched controls (Chaparral AD proteomics). This upregulation suggests potential engagement of ER stress pathways or calcium dysregulation mechanisms in the AD brain, consistent with WFS1's known role in stress response modulation.