Hypotrichosis 1, also known as hypt1, is related to hypotrichosis 2 and hypotrichosis 3. An important gene associated with Hypotrichosis 1 is APCDD1 (APC Down-Regulated 1). The drugs Gentamicins and Anti-Bacterial Agents have been mentioned in the context of this disorder. Affiliated tissues include skin, and related phenotypes are sparse hair and abnormality of the dentition