Biotinidase Deficiency: Primary Care Guide to a Positive Newborn Screen

Guidance for primary care clinicians receiving a positive newborn screen result Biotinidase is an autosomal recessive inherited disorder in which the body is unable to reuse and recycle biotin, a B complex vitamin found in foods such as liver, egg yolks, nuts, and milk. Biotinidase is responsible for the extraction of biotin from ingested dietary …

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 …