The function of Ensembl gene identifier ENSG00000181915 (ADO, 2-aminoethanethiol dioxygenase) is as follows. Plays a vital role in regulating thiol metabolism and preserving oxygen homeostasis by oxidizing the sulfur of cysteamine and N-terminal cysteine-containing proteins to their corresponding sulfinic acids using O2 as a cosubstrate (PubMed:17581819, PubMed:29752763, PubMed:31273118, PubMed:32601061). Catalyzes the oxidation of cysteamine (2-aminoethanethiol) to hypotaurine (PubMed:17581819, PubMed:29752763, PubMed:32601061). Catalyzes the oxidation of regulators of G protein signaling 4 (RGS4) and 5 (RGS5) and interleukin-32 (IL32) (PubMed:31273118, PubMed:32601061). {ECO:0000269|PubMed:17581819, ECO:0000269|PubMed:29752763, ECO:0000269|PubMed:31273118, ECO:0000269|PubMed:32601061}.