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J Biol Chem, Vol. 274, Issue 9, 5532-5536, February 26, 1999
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From the Glycogen storage disease type 1b (GSD-1b) is
proposed to be caused by a deficiency in microsomal glucose 6-phosphate
(G6P) transport, causing a loss of glucose-6-phosphatase activity and glucose homeostasis. However, for decades, this disorder has defied molecular characterization. In this study, we characterize the structural organization of the G6P transporter gene and identify mutations in the gene that segregate with the GSD-1b disorder. We
report the functional characterization of the recombinant G6P transporter and demonstrate that mutations uncovered in GSD-1b patients
disrupt G6P transport. Our results, for the first time, define a
molecular basis for functional deficiency in GSD-1b and raise the
possibility that the defective G6P transporter contributes to
neutropenia and neutrophil/monocyte dysfunctions characteristic of
GSD-1b patients.
Heritable Disorders Branch, NICHD, National
Institutes of Health, Bethesda, Maryland, 20892 and the
¶ Pediatric Division, Ben-Gurion University of the Negev,
Beer-Sheva 84101, Israel
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