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A novel mutation in the sterol 27-hydroxylase gene of a woman with autosomal recessive cerebrotendinous xanthomatosis

By Garuti Rita, Vogel Hans-Peter, Lingesleben Alexandra, Schneider Hauke and Calandra Sebastiano

Abstract

<p>Article abstract</p> <p>Mutations of the gene encoding the mitochondrial enzyme sterol 27-hydroxylase (<it>CYP27A1 </it>gene) cause defects in the cholesterol pathway to bile acids that lead to the storage of cholestanol and cholesterol in tendons, lenses and the central nervous system. This disorder is the cause of a clinical syndrome known as cerebrotendinous xanthomatosis (CTX). Since 1991 several mutations of the <it>CYP27A1 </it>gene have been reported. We diagnosed the clinical features of CTX in a caucasian woman. Serum levels of cholestanol and 7α-hydroxycholesterol were elevated and the concentration of 27-hydroxycholesterol was reduced. Bile alcohols in the urine and faeces were increased. The analysis of the <it>CYP27A1 </it>gene showed that the patient was a compound heterozygote carrying two mutations both located in exon 8. One mutation is a novel four nucleotide deletion (c.1330-1333delTTCC) that results in a frameshift and the occurrence of a premature stop codon leading to the formation of a truncated protein of 448 amino acids. The other mutation, previously reported, is a C - > T transition (c. c.1381C > T) that converts the glutamine codon at position 461 into a termination codon (p.Q461X). These truncated proteins are expected to have no biological function being devoid of the cysteine residue at position 476 of the normal enzyme that is crucial for heme binding and enzyme activity.</p

Topics: Therapeutics. Pharmacology, RM1-950, Medicine, R, DOAJ:Therapeutics, DOAJ:Medicine (General), DOAJ:Health Sciences, Internal medicine, RC31-1245, DOAJ:Internal medicine
Publisher: BioMed Central
Year: 2010
DOI identifier: 10.1186/1750-1172-5-27
OAI identifier: oai:doaj.org/article:002dca0288e3473c9f8746844b488d65
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