GUCY1B1 encodes the beta-1 subunit of soluble guanylate cyclase (sGC), a heterodimeric enzyme critical for nitric oxide (NO)-cGMP signaling pathways 1. The protein is expressed in retinal vascular cells, neuronal elements including ganglion and bipolar cells, and vascular smooth muscle cells 12. GUCY1B1 functions as part of the sGC complex that catalyzes cGMP biosynthesis in response to NO binding, mediating cellular responses essential for vasodilation and neuroprotection 12. The gene's transcription is regulated by FoxO4, which acts as a transcriptional activator by binding FoxO DNA motifs in the GUCY1B1 promoter region 2. Expression is upregulated by sildenafil treatment, enhancing cGMP signaling and steroidogenic function 3. GUCY1B1 shows disease relevance across multiple conditions: it serves as a potential immune-metabolic checkpoint in colon adenocarcinoma 4, demonstrates neuroprotective effects when activated by runcaciguat in diabetic and ischemic retinopathy models 1, and is associated with EMT-type gastric tumors and lung adenocarcinoma prognosis 56. The gene is also linked to vascular aging, with decreased expression observed with advancing age 7, and shows altered expression patterns in childhood obesity-related cardiometabolic complications 8.