A novel indel variant in LDLR responsible for familial hypercholesterolemia in a Chinese family.

A novel indel variant in LDLR responsible for familial hypercholesterolemia in a Chinese family.
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DOI:
10.1371/journal.pone.0189316
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发表时间:
2017
期刊:
影响因子:
3.7
通讯作者:
Wang Y
Wang Y
中科院分区:
综合性期刊3区
文献类型:
--
作者:
Shu H;Chi J;Li J;Zhang W;Lv W;Wang J;Deng Y;Hou X;Wang Y

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家族性高胆固醇血症(FH)是一种遗传性疾病,其特征是与低密度脂蛋白结合的血清胆固醇升高。LDLR基因突变是导致FH的主要因素。在这项研究中,我们招募了一个四代同堂的中国家庭FH和确定的临床特点,高胆固醇血症。所有受影响的个体在LDLR的外显子13中共享新的indel突变(c.1885_1889delinsGATCATCAACC)。该突变与家族中的高胆固醇血症表型分离。为了分析indel的功能,我们在Hep G2细胞中建立了突变型和野生型LDLR的稳定克隆。突变体LDLR被保留在内质网(ER),并未能通过高尔基体糖基化。此外,膜LDLR减少,丧失摄取LDL的能力。我们的数据还扩大了已知LDLR突变的范围。
Familial hypercholesterolemia (FH) is an inherited disorder characterized by elevation of serum cholesterol bound to low-density lipoprotein. Mutations in LDLR are the major factors responsible for FH. In this study, we recruited a four-generation Chinese family with FH and identified the clinical features of hypercholesterolemia. All affected individuals shared a novel indel mutation (c.1885_1889delinsGATCATCAACC) in exon 13 of LDLR. The mutation segregated with the hypercholesterolemia phenotype in the family. To analyze the function of the indel, we established stable clones of mutant and wild-type LDLR in Hep G2 cells. The mutant LDLR was retained in the endoplasmic reticulum (ER) and failed to glycosylate via the Golgi. Moreover, the membrane LDLR was reduced and lost the ability to take up LDL. Our data also expand the spectrum of known LDLR mutations.
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