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The familial hypercholesterolemia (FH)-North Karelia mutation of the low density lipoprotein receptor gene deletes seven nucleotides of exon 6 and is a common cause of FH in Finland
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1992 (English)In: Journal of Clinical Investigation, ISSN 0021-9738, E-ISSN 1558-8238, Vol. 90, no 1, 219-228 p.Article in journal (Refereed) Published
Abstract [en]

A mutation of the LDL receptor gene very common among Finnish patients with heterozygous familial hypercholesterolemia (FH) was identified. This mutation, designated as FH-North Karelia, deletes seven nucleotides from exon 6 of the LDL receptor gene, causes a translational frameshift, and is predicted to result in a truncated receptor protein. Only minute quantities of mRNA corresponding to the deleted gene were detected. Functional studies using cultured fibroblasts from the patients revealed that the FH-North Karelia gene is associated with a receptor-negative (or binding-defective) phenotype of FH. Carriers of the FH-North Karelia gene showed a typical xanthomatous form of FH, with mean serum total and LDL cholesterol levels of 12 and 10 mmol/liter, respectively. This mutation was found in 69 (34%) out of 201 nonrelated Finnish FH patients and was especially abundant (prevalence 79%) in patients from the eastern Finland. These results, combined with our earlier data on another LDL receptor gene deletion (FH-Helsinki), demonstrate that two "Finnish-type" mutant LDL receptor genes make up about two thirds of FH mutations in this country, reflecting a founder gene effect. This background provides good possibilities to examine whether genetic heterogeneity affects the clinical presentation or responsiveness to therapeutic interventions in FH.

Place, publisher, year, edition, pages
1992. Vol. 90, no 1, 219-228 p.
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Medical and Health Sciences
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URN: urn:nbn:se:uu:diva-169834DOI: 10.1172/JCI115839PubMedID: 1634609OAI: oai:DiVA.org:uu-169834DiVA: diva2:507798
Available from: 2012-03-06 Created: 2012-03-06 Last updated: 2017-12-07Bibliographically approved

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Syvänen, Ann-Christine

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