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. 1993 Jun;91(6):2488–2496. doi: 10.1172/JCI116484

Frameshift and splice-junction mutations in the sterol 27-hydroxylase gene cause cerebrotendinous xanthomatosis in Jews or Moroccan origin.

E Leitersdorf 1, A Reshef 1, V Meiner 1, R Levitzki 1, S P Schwartz 1, E J Dann 1, N Berkman 1, J J Cali 1, L Klapholz 1, V M Berginer 1
PMCID: PMC443309  PMID: 8514861

Abstract

The sterol 27-hydroxylase (EC 1.14.13.15) catalyzes steps in the oxidation of sterol intermediates that form bile acids. Mutations in this gene give rise to the autosomal recessive disease cerebrotendinous xanthomatosis (CTX). CTX is characterized by tendon xanthomas, cataracts, a multitude of neurological manifestations, and premature atherosclerosis. A relatively high prevalence of the disease has been noted in Jews originating from Morocco. The major objectives of the present investigation were to determine the gene structure and characterize the common mutant alleles that cause CTX in Moroccan Jews. The gene contains nine exons and eight introns and encompasses at least 18.6 kb of DNA. The putative promoter region is rich in guanidine and cytosine residues and contains potential binding sites for the transcription factor Sp1 and the liver transcription factor, LF-B1. Blotting analysis revealed that the mutant alleles do not produce any detectable sterol 27-hydroxylase mRNA. No major gene rearrangements were found and single-strand conformational polymorphism followed by sequence analysis identified two underlying mutations: deletion of thymidine in exon 4 and a guanosine to adenosine substitution at the 3' splice acceptor site of intron 4 of the gene. The molecular characterization of CTX in Jews of Moroccan origin provides a definitive diagnosis of this treatable disease.

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