CYP2C19*9 Allele

**Semantic type:** Gene or Genome

**Definition:** Human CYP2C19*9 allele is located within 10q24.1-q24.3 and is approximately 90 kb in length. This allele, a variant form of the CYP2C19 wild-type allele, encodes cytochrome P450 2C19*9 protein. The CYP2C19*9 allele exhibits a clinically-relevant SNP (c.431G>A) in exon 3 that results in a R144H coding change. This alteration in protein sequence decreases the enzymatic activity of the cytochrome P450 2C19*9 protein.

**Synonyms:** - CYP2C19*9 - CYP2C19, R144H - CYP2C19, c.431G>A - Cytochrome P450, Family 2, Subfamily C, Polypeptide 19*9 Allele