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HIBCH deficiency in a patient with phenotypic characteristics of mitochondrial disorders.

Abstract
HIBCH (3-hydroxyisobutyryl-CoA hydrolase) deficiency (MIM #250620) is a rare autosomal recessive inborn error of metabolism, leading to a block in the catabolic pathway of the amino acid valine and presumably to accumulation of toxic valine metabolites in mitochondria. Only three families with HIBCH deficiency and biallelic HIBCH mutations have been described. We report on a further patient, first child of healthy consanguineous parents, with severe developmental delay, seizures, hyperintensities of the basal ganglia on magnetic resonance imaging (MRI), progressive brain atrophy, optic nerve atrophy, repeatedly elevated blood lactate, and respiratory chain complexes I, I + III and cytochrome c oxidase deficiencies with borderline depletion of mitochondrial DNA in muscle tissue. Laboratory findings in blood and skeletal muscle were inconsistent and did not allow a definite diagnosis, but supported the hypothesis of mitochondrial dysfunction. Homozygosity mapping and whole-exome sequencing revealed a homozygous one-base pair insertion in HIBCH. Deficiency of enzyme activity was confirmed in cultured fibroblasts. Although relatively unspecific, the clinical features were similar to those of the previously reported cases. Given the clinical variability and large number of differential diagnoses, the prevalence of HIBCH deficiency is probably underestimated. Next-generation sequencing approaches are an effective tool for identifying the underlying genetic basis in patients suspected of mitochondrial disorders.
AuthorsMiriam S Reuter, Jörn Oliver Sass, Thomas Leis, Julia Köhler, Johannes A Mayr, René G Feichtinger, Manfred Rauh, Ina Schanze, Luzy Bähr, Regina Trollmann, Steffen Uebe, Arif B Ekici, André Reis
JournalAmerican journal of medical genetics. Part A (Am J Med Genet A) Vol. 164A Issue 12 Pg. 3162-9 (Dec 2014) ISSN: 1552-4833 [Electronic] United States
PMID25251209 (Publication Type: Case Reports, Journal Article, Research Support, Non-U.S. Gov't)
Copyright© 2014 Wiley Periodicals, Inc.
Chemical References
  • Thiolester Hydrolases
Topics
  • Abnormalities, Multiple (genetics, pathology)
  • Amino Acid Metabolism, Inborn Errors (genetics, pathology)
  • Base Sequence
  • Blotting, Western
  • Brain (pathology)
  • Exome (genetics)
  • Fibroblasts (metabolism)
  • Humans
  • Magnetic Resonance Imaging
  • Mitochondrial Diseases (genetics, pathology)
  • Molecular Sequence Data
  • Muscle, Skeletal (pathology)
  • Pedigree
  • Phenotype
  • Sequence Analysis, DNA (methods)
  • Thiolester Hydrolases (deficiency, genetics)

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