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Mutations of the Microsomal Triglyceride-Transfer–Protein Gene in Abetalipoproteinemia

机译:Abeta脂蛋白血症的微粒体甘油三酸酯转移蛋白基因的突变

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摘要

Elevated plasma levels of apolipoprotein B (apoB)–containing lipoproteins constitute a major risk factor for the development of coronary heart disease. In the rare recessively inherited disorder abetalipoproteinemia (ABL) the production of apoB-containing lipoproteins is abolished, despite no abnormality of the apoB gene. In the current study we have characterized the gene encoding a microsomal triglyceride-transfer protein (MTP), localized to chromosome 4q22-24, and have identified a mutation of the MTP gene in both alleles of all individuals in a cohort of eight patients with classical ABL. Each mutant allele is predicted to encode a truncated form of MTP with a variable number of aberrant amino acids at its C-terminal end. Expression of genetically engineered forms of MTP in Cos-1 cells indicates that the C-terminal portion of MTP is necessary for triglyceride-transfer activity. Deletion of 20 amino acids from the carboxyl terminus of the 894-amino-acid protein and a missense mutation of cysteine 878 to serine both abolished activity. These results establish that defects of the MTP gene are the predominant, if not sole, cause of hereditary ABL and that an intact carboxyl terminus is necessary for activity.
机译:血浆中含有载脂蛋白B(apoB)的脂蛋白水平升高是发展冠心病的主要危险因素。尽管apoB基因没有异常,但在罕见的隐性遗传性疾病abetalipoproteinemia(ABL)中,含apoB的脂蛋白的产生被消除了。在当前的研究中,我们已经表征了编码微粒体甘油三酸酯转移蛋白(MTP)的基因,该基因位于染色体4q22-24上,并且已经在八名患有经典疾病的患者队列中的所有个体的两个等位基因中鉴定了MTP基因的突变ABL。预测每个突变等位基因编码在其C末端具有可变数目的异常氨基酸的MTP的截短形式。 MTP的基因工程形式在Cos-1细胞中的表达表明MTP的C端部分对于甘油三酸酯转移活性是必需的。从894个氨基酸的蛋白质的羧基末端删除20个氨基酸以及半胱氨酸878向丝氨酸的错义突变都废除了活性。这些结果表明,MTP基因的缺陷是遗传性ABL的主要原因,即使不是唯一的原因,并且完整的羧基末端对于活性是必需的。

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