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ObjectiveTo screen for LDLR gene mutations in 9 patients with familial hypercholesterolemia (FH).MethodsAll exons of the LDLR gene and flanking intronic sequences were amplified by PCR and subjected to automatic DNA sequencing. For patients with homozygous or compound heterozygous mutations, parental DNA sequencing or T cloning sequencing was carried out to determine the parental origin of the mutant alleles.ResultsDirect sequencing of PCR products revealed 8 LDLR variants in 7 patients, which included c.259T>G, c.513delC, c.530C>T, c.682G>T, c.763C>T, c.1187-10G>A, c.1948delG, and c.1730G>A, among which c.1948delG was novel. Four patients have carried heterozygous mutations, two carried homozygous mutations, and one carried compound heterozygous mutations. The patients with biallelic mutations presented with a more severe phenotype compared those carrying heterozygous mutations.ConclusionLDLR mutations were identified in 7 out of 9 patients with FH. Among the 8 identified LDLR mutations, c.1948delG was firstly reported. Above findings have expanded the mutation spectrum of LDLR gene.

Original publication

DOI

10.3760/cma.j.issn.1003-9406.2018.06.001

Type

Journal article

Journal

Zhonghua yi xue yi chuan xue za zhi = Zhonghua yixue yichuanxue zazhi = Chinese journal of medical genetics

Publication Date

12/2018

Volume

35

Pages

783 - 786

Addresses

McKusick-Zhang Center for Genetic Medicine and State Key Laboratory of Medical Molecular Biology, Institute of Basic Medical Sciences, Chinese Academy of Medical Sciences & Peking Union Medical College, Beijing 100005, China. camsww@hotmail.com.

Keywords

Humans, Receptors, LDL, DNA Mutational Analysis, Phenotype, Mutation, Hyperlipoproteinemia Type II, Genetic Testing