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Identification of recurrent and novel mutations in the LDL receptor gene in German patients with familial hypercholesterolemia

✍ Scribed by M.S. Nauck; W. Köster; K. Dörfer; J. Eckes; H. Scharnagl; H. Gierens; H. Nissen; M.A. Nauck; H. Wieland; Winfried März


Publisher
John Wiley and Sons
Year
2001
Tongue
English
Weight
58 KB
Volume
18
Category
Article
ISSN
1059-7794

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✦ Synopsis


In order to identify mutations in the low density lipoprotein receptor (LDLR) gene in primary hypercholesterolemia, we screened 100 unrelated German individuals with elevated plasma LDL-C (LDL-C > 4,7 mmol/l) for mutations in the 18 exons and their flanking intronic sequences including the promoter region of the LDL-R gene using a combination of polymerase chain reaction (PCR), denaturing gradient gel electrophoresis (DGGE) and direct sequencing. In addition we tested all patients for the presence of mutations in codons 3456 -3553 of the gene encoding apolipoprotein B-100. In 56 individuals we detected 37 different mutations affecting the LDL-R gene, 16 of which, designated C122R, C127Y, C163W, F179L, R236W, E296X, R553C, V618D, T721I, V785D, G1358+2A, 257delTCTGGAGGT, 657delC, 676insACGGTATGGACTGCAdelGACG, C1205delTCT, 2420delTCCTTCT, have not yet been reported. One proband was a compound heterozygote showing two separate sequence variations (E207X and T705I). Seven patients were heterozygous for the mutation R3500Q within the apoB-100 gene. These results demonstrate that there is a broad spectrum of mutations in the LDL-R gene and that the R3500Q mutation is a frequent cause of hypercholesterolemia in the German population.


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