CNNM1 (cyclin and CBS domain divalent metal cation transport mediator 1) is a transmembrane protein that functions as a probable metal transporter involved in magnesium ion homeostasis 1. The protein contains a transmembrane domain, CBS-domain pair, and a CNBH domain that collectively mediate its function 2. CNNM1 plays a regulatory role in ion channel function by selectively binding and modulating TRPM7, an ion channel-kinase, with the CBS-pair and CNBH domains providing critical contact points for channel and kinase activity modulation 2. Post-translational modifications, specifically complex N-glycosylation mediated by ARL15 interaction, regulate CNNM1's magnesium transport capacity 3. Clinically, CNNM1 has emerged as a significant player in cancer pathogenesis. The gene harbors recurrent mutations in pulmonary carcinoid tumors affecting cancer-relevant pathways 4 and is implicated in prostate cancer angiogenesis, where elevated CNNM1 expression promotes vascular growth through upregulation of angiogenic markers 5. In hepatocellular carcinoma, CNNM1 is a target of miR-9-5p and is upregulated through sequestration by the long noncoding RNA SNHG7, promoting cancer cell proliferation 6. Additionally, CNNM1 mutations are associated with invasion and metastasis in acral melanoma 7 and contribute to diagnostic and prognostic signatures in glioma and epilepsy 8.