2M3HBA Deficiency: Primary Care Guide to a Positive Newborn Screen

Introduction: 2M3HBA deficiency is an X-linked disorder caused by pathogenic variants in the HSD17B10 gene (previously known as HADH2), which encodes the enzyme 17β-hydroxysteroid dehydrogenase type 10. This enzyme has a significant role in 2 major pathways: (1) the catabolism of the branched-chain amino acid isoleucine, resulting in elevated levels of acylcarnitine species when deficient, and (2) a …