Adenosine deaminase (ADA) wani enzyme ne wanda ke haifar da kawar da rukunin amino daga adenosine, kwayoyin nucleoside da ke kunshe da adenine da ribose. Wannan tsari yana haifar da samuwar inosine, wani nucleoside. ADA tana taka muhimmiyar rawa a cikin metabolism na purine, tsarin da jiki ke rushe purines, waɗanda sune mahimman abubuwan DNA da RNA, da sauran mahimman ƙwayoyin halittu masu yawa. Rashin gazawa a cikin ADA na iya haifar da wata cuta mai saurin kamuwa da kwayoyin halitta da ake kira tsananin hadedde immunodeficiency (SCID), wanda ke shafar tsarin garkuwar jiki kuma yana iya mutuwa idan ba a kula da shi ba.