Cysteine-rich and transmembrane domain-containing protein 1 (CYSTM1)

Cysteine-rich and transmembrane domain-containing protein 1 (CYSTM1) is a small, transmembrane protein with a highly conserved cysteine-rich C-terminal domain and a single transmembrane helix, characteristic of the CYSTM peptide family. CYSTM1 is expressed in extracellular exosomes and various tissues, but its cellular functions in humans are not fully defined. Transcriptomic studies have implicated CYSTM1 as a potential biomarker in Huntington's disease, where its blood expression associates with clinical severity, and in pediatric septic shock, where it helps distinguish patients in machine learning classifiers. Related CYSTM family members in yeast and plants confer resistance to diverse stressors, hinting at evolutionary conserved roles in stress response or signaling, yet CYSTM1 itself is not validated as a classical receptor, enzyme, or drug-target protein and has no known interacting drugs. Keeper cysteines in its transmembrane domain likely affect structure via disulfide bonding, and the C-terminal domain may mediate dimerization, but functional details require further research. Key points: - CYSTM1 is not an established therapeutic target such as a classic receptor, transporter, or enzyme. - Its main biomedical relevance currently lies in its biomarker status for certain diseases, notably Huntington’s disease and pediatric septic shock. - The molecular family is unique and poorly characterized compared to known therapeutic targets and more is needed to clarify its function and druggability.

Other names

C5orf32ORF1-FL49UPF0467 protein C5orf32putative nuclear protein ORF1-FL49