GDA (guanine deaminase) is a cytosolic enzyme that catalyzes the hydrolytic deamination of guanine to produce xanthine and ammonia, functioning as a key enzyme in guanine catabolism and nucleobase metabolism. The protein contains a zinc ion binding domain essential for its catalytic activity and exhibits protein binding capabilities. GDA participates in nervous system development through its role in nucleobase-containing compound metabolism, linking nucleotide catabolism to neural function. The enzyme operates within the broader purine degradation pathway, converting guanine through sequential enzymatic steps. While the provided abstracts do not contain direct evidence of GDA's involvement in human disease pathology, the metabolic role of purine catabolism suggests potential relevance to conditions involving altered nucleotide metabolism. Clinical significance remains to be established through direct investigation of GDA dysfunction in human populations. The enzyme's zinc-dependent mechanism and cellular localization position it as a potential therapeutic target, though specific clinical applications require further characterization. GDA represents an understudied component of cellular nucleotide homeostasis with implications for metabolic disorders, though comprehensive disease association studies are currently lacking.