Identification and analysis of mutations in the Wilson disease gene (ATP7B): Population frequencies, genotype-phenotype correlation, and functional analyses

Anjali B. Shah, Igor Chernov, Hong Tao Zhang, Barbara M. Ross, Kamna Das, Svetlana Lutsenko, Enrico Parano, Lorenzo Pavone, Oleg Evgrafov, Irina A. Ivanova-Smolenskaya, Göran Annerén, Kerstin Westermark, Francisco Hevia Urrutia, Graciela K. Penchaszadeh, Irmin Sternlieb, I. Herbert Scheinberg, T. Conrad Gilliam, Konstantin Petrukhin

Research output: Contribution to journalArticle

Abstract

Wilson disease (WD) is an autosomal recessive disorder characterized by toxic accumulation of copper in the liver and subsequently in the brain and other organs. On the basis of sequence homology to known genes, the WD gene (ATP7B) appears to be a copper-transporting P-type ATPase. A search for ATP7B mutations in WD patients from five population samples, including 109 North American patients, revealed 27 distinct mutations, 18 of which are novel. A composite of published findings shows missense mutations in all exons-except in exons 1-5, which encode the six copper-binding motifs, and in exon 21, which spans the carboxy-terminus and the poly(A) tail. Over one-half of all WD mutations occur only rarely in any population sample. A splice-site mutation in exon 12 accounts for 3% of the WD mutations in our sample and produces an in-frame, 39-bp insertion in mRNA of patients homozygous, but not heterozygous, for the mutation. The most common WD mutation (His1069Glu) was represented in ~38% of all the WD chromosomes from the North American, Russian, and Swedish samples. In several population cohorts, this mutation deviated from Hardy-Weinberg equilibrium, with an overrepresentation of homozygotes. We did not find a significant correlation between His1069Glu homozygosity and several clinical indices, including age of onset, clinical manifestation, ceruloplasmin activity, hepatic copper levels, and the presence of Kayser-Fleischer rings. Finally, lymphoblast cell lines from individuals homozygous for His-1069Glu and 4 other mutations all demonstrated significantly decreased copper-stimulated ATPase activity.

Original languageEnglish (US)
Pages (from-to)317-328
Number of pages12
JournalAmerican journal of human genetics
Volume61
Issue number2
DOIs
StatePublished - Aug 1997
Externally publishedYes

ASJC Scopus subject areas

  • Genetics
  • Genetics(clinical)

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    Shah, A. B., Chernov, I., Zhang, H. T., Ross, B. M., Das, K., Lutsenko, S., Parano, E., Pavone, L., Evgrafov, O., Ivanova-Smolenskaya, I. A., Annerén, G., Westermark, K., Urrutia, F. H., Penchaszadeh, G. K., Sternlieb, I., Scheinberg, I. H., Gilliam, T. C., & Petrukhin, K. (1997). Identification and analysis of mutations in the Wilson disease gene (ATP7B): Population frequencies, genotype-phenotype correlation, and functional analyses. American journal of human genetics, 61(2), 317-328. https://doi.org/10.1086/514864