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Whole-exome sequencing detects somatic mutations of IDH1 in metaphyseal chondromatosis with D-2-hydroxyglutaric aciduria (MC-HGA).

Authors
Vissers, LE; Fano, V; Martinelli, D; Campos-Xavier, B; Barbuti, D; Cho, TJ; Dursun, A; Kim, OH; Lee, SH; Timpani, G; Nishimura, G; Unger, S; Sass, JO; Veltman, JA; Brunner, HG; Bonafé, L; Dionisi-Vici, C; Superti-Furga, A
Citation
American journal of medical genetics. Part A, 155A(11):2609-2616, 2011
Journal Title
American journal of medical genetics. Part A
ISSN
1552-48251552-4833
Abstract
We used exome sequencing of blood DNA in four unrelated patients to identify the genetic basis of metaphyseal chondromatosis with urinary excretion of D-2-hydroxy-glutaric acid (MC-HGA), a rare entity comprising severe chondrodysplasia, organic aciduria, and variable cerebral involvement. No evidence for recessive mutations was found; instead, two patients showed mutations in IDH1 predicting p.R132H and p.R132S as apparent somatic mosaicism. Sanger sequencing confirmed the presence of the mutation in blood DNA in one patient, and in blood and saliva (but not in fibroblast) DNA in the other patient. Mutations at codon 132 of IDH1 change the enzymatic specificity of the cytoplasmic isocitrate dehydrogenase enzyme. They result in increased D-2-hydroxy-glutarate production, α-ketoglutarate depletion, activation of HIF-1α (a key regulator of chondrocyte proliferation at the growth plate), and reduction of N-acetyl-aspartyl-glutamate level in glial cells. Thus, somatic mutations in IDH1 may explain all features of MC-HGA, including sporadic occurrence, metaphyseal disorganization, and chondromatosis, urinary excretion of D-2-hydroxy-glutaric acid, and reduced cerebral myelinization.
MeSH terms
Brain Diseases, Metabolic, Inborn/blood/enzymology/*genetics/pathology/urineChondromatosis/blood/enzymology/*genetics/pathologyDNA Mutational Analysis/methodsExomeFemaleGenetic Association Studies/methodsGenome, HumanGenotypeGlutarates/urineHumansHypoxia-Inducible Factor 1, alpha Subunit/metabolismInfantIsocitrate Dehydrogenase/blood/*geneticsKetoglutaric Acids/metabolismMaleMutationSaliva/chemistrySubstrate Specificity
DOI
10.1002/ajmg.a.34325
PMID
22025298
Appears in Collections:
Journal Papers > School of Medicine / Graduate School of Medicine > Radiology
AJOU Authors
김, 옥화
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