The Difference Between Rare and Exceptionally Rare: Molecular Characterization of Ribose 5-phosphate Isomerase Deficiency

Overview

Journal J Mol Med (Berl)

Specialty General Medicine

Date 2010 May 26

PMID 20499043

Citations 9

Authors

Mirjam M C Wamelink

Nana-Maria Gruning

Erwin E W Jansen

Katharina Bluemlein

Hans Lehrach

Cornelis Jakobs

Markus Ralser

Affiliations

Soon will be listed here.

Abstract

Ribose 5-phosphate isomerase (RPI) deficiency is an enzymopathy of the pentose phosphate pathway. It manifests with progressive leukoencephalopathy and peripheral neuropathy and belongs, with one sole diagnosed case, to the rarest human disorders. The single patient was found compound heterozygous for a RPI frameshift and a missense (RPI(Ala61Val)) allele. Here, we report that two patient-derived cell lines differ in RPI enzyme activity, enzyme concentration, and mRNA expression. Furthermore, we present a transgenic yeast model, which exhibits metabolite- and enzyme-activity changes that correspond to the human syndrome and show that the decrease in RPI activity in patient cells is not fully attributable to the residue exchange. Taken together, our results demonstrate that RPI deficiency is caused by the combination of a RPI null allele with an allele that encodes for a partially active enzyme which has, in addition, cell-type-dependent expression deficits. We speculate that a low probability for comparable traits accounts for the rareness of RPI deficiency.

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