Send to:

Choose Destination
See comment in PubMed Commons below
Hum Mol Genet. 2014 Sep 15;23(R1):R1-8. doi: 10.1093/hmg/ddu123. Epub 2014 Mar 20.

Branched-chain amino acid metabolism: from rare Mendelian diseases to more common disorders.

Author information

  • 1Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA.
  • 2Department of Pediatrics, University of Montreal, Montreal, QC, Canada.
  • 3Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX 77030, USA Howard Hughes Medical Institute, Houston, TX 77030, USA


Branched-chain amino acid (BCAA) metabolism plays a central role in the pathophysiology of both rare inborn errors of metabolism and the more common multifactorial diseases. Although deficiency of the branched-chain ketoacid dehydrogenase (BCKDC) and associated elevations in the BCAAs and their ketoacids have been recognized as the cause of maple syrup urine disease (MSUD) for decades, treatment options for this disorder have been limited to dietary interventions. In recent years, the discovery of improved leucine tolerance after liver transplantation has resulted in a new therapeutic strategy for this disorder. Likewise, targeting the regulation of the BCKDC activity may be an alternative potential treatment strategy for MSUD. The regulation of the BCKDC by the branched-chain ketoacid dehydrogenase kinase has also been implicated in a new inborn error of metabolism characterized by autism, intellectual disability and seizures. Finally, there is a growing body of literature implicating BCAA metabolism in more common disorders such as the metabolic syndrome, cancer and hepatic disease. This review surveys the knowledge acquired on the topic over the past 50 years and focuses on recent developments in the field of BCAA metabolism.

© The Author 2014. Published by Oxford University Press. All rights reserved. For Permissions, please email:

[PubMed - indexed for MEDLINE]
Free PMC Article
PubMed Commons home

PubMed Commons

How to join PubMed Commons

    Supplemental Content

    Full text links

    Icon for HighWire Icon for PubMed Central
    Loading ...
    Write to the Help Desk