• Journal of The Korean Society of Inherited Metabolic disease
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• v.12 no.1
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• pp.54-57
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• 2012

A 3-year-old boy was transferred to emergency room (ER) with lethargy and abdominal pain. Physical examination revealed drowsy mental status but neurologically intact. Basic evaluation in ER shows hypoglycemia (43 mg/dL), hyperglycerolemia, ketonemia and ketonuria. Initial urine organic acid was performed and the result showed severe hyperglyceroluria. Under suspicion of isolated GKD, GKD gene was obtained from his DNA from white blood cell in peripheral blood and sequencing was performed. Isolated glycerol kinase deficiency (GKD) is an X-linked inborn error of metabolism that is either symptomatic or asymptomatic. GKD is due to deletions of, or mutations within, the GK gene, and there is no genotype-phenotype correlation. Gene study that we performed showed normal at a well-known mutation site, but found 4-base insertion at 79 base pair away from the beginning of exon 11.