文章基本信息
- 标题：Novel mutations of the lipoprotein lipase gene associated with hypertriglyceridemia in members of type 2 diabetic pedigrees
- 本地全文：下载
- 作者：Hu, Yaomin ; Ren, Yan ; Luo, Robert Z. 等
- 期刊名称：JLR Papers In Press
- 印刷版ISSN：0022-2275
- 电子版ISSN：1539-7262
- 出版年度：2007
- 卷号：48
- 期号：8
- 页码：1681-1688
- DOI：10.1194/jlr.M600382-JLR200
- 出版社：American Society for Biochemistry and Molecular Biology
- 摘要：Increased plasma triglyceride and free fatty acid levels are frequently associated with type 2 diabetes mellitus (T2DM). To test the hypothesis that LPL gene mutations contribute to the hypertriglyceridemia observed in members of T2DM pedigrees, we screened the LPL gene in 53 hypertriglyceridemic members of 26 families. Four known and three novel mutations were identified. All three novel mutations, Lys312insC, Thr361insA, and double mutation Lys312insC + Asn291Ser, are clinically associated with hypertriglyceridemia. In vitro mutagenesis and expression studies confirm that these variants are associated with a significant reduction in LPL activity. The modeled structures displaying the Lys312insC and Thr361insA mutations showed loss of the activity-related C-terminal domain in the LPL protein. Another novel double mutation, Lys312insC + Asn291Ser, resulted in the loss of the catalytic ability of LPL attributable to the complete loss of the C-terminal domain and alteration in the heparin association site. Thus, these novel mutations of the LPL gene contribute to the hypertriglyceridemia observed in members of type 2 diabetic pedigrees. Supplementary key words mutation • function • molecular modeling Abbreviations: DHPLC, denaturing high-performance liquid chromatography; SSCP, single-strand conformation polymorphism; T2DM, type 2 diabetes mellitus; TG, triglyceride
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