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Ketoacidosis is a potentially lethal condition caused by the imbalance between hepatic production and extrahepatic utilization of ketone bodies. We performed exome sequencing in a patient with recurrent, severe ketoacidosis and identified a homozygous frameshift mutation in the gene encoding monocarboxylate transporter 1 (SLC16A1, also called MCT1). Genetic analysis in 96 patients suspected of having ketolytic defects yielded seven additional inactivating mutations in MCT1, both homozygous and heterozygous. Mutational status was found to be correlated with ketoacidosis severity, MCT1 protein levels, and transport capacity. Thus, MCT1 deficiency is a novel cause of profound ketoacidosis; the present work suggests that MCT1-mediated ketone-body transport is needed to maintain acid-base balance.
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Peter M. van Hasselt
Sacha Ferdinandusse
Glen R. Monroe
New England Journal of Medicine
Radboud University Nijmegen
University Medical Center Utrecht
Amsterdam UMC Location University of Amsterdam
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Hasselt et al. (Wed,) studied this question.
www.synapsesocial.com/papers/69d71c968a0e2c5879bef256 — DOI: https://doi.org/10.1056/nejmoa1407778