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Deep phenotyping of ANGPTL3, ANGPTL4 and ANGPTL8 human knockouts and population based studies

ANGPTL3、ANGPTL4 和 ANGPTL8 人类基因敲除的深度表型分析和基于人群的研究

基本信息

批准号：
10528964
负责人：
Daniel James Rader
金额：
$ 61.94万
依托单位：
COLUMBIA UNIVERSITY HEALTH SCIENCES
依托单位国家：
美国
项目类别：
财政年份：
2019
资助国家：
美国
起止时间：
2019-02-01 至 2024-01-31
项目状态：
已结题

来源：
https://reporter.nih.gov/project-details/10528964
关键词：
ANGPTL3 gene ANGPTL4 gene Address Animal Model Antisense Oligonucleotides Apolipoprotein A-I Apolipoproteins A Apolipoproteins B Biological Biology Cardiometabolic Disease Catabolism Consanguinity Coronary heart disease Data Development Disease Dose Enrollment Etiology Family Fasting Fatty acid glycerol esters Genes Genetic Genomics Genotype Hepatic Heterozygote High Density Lipoproteins Human Individual Isotopes Italy Kinetics Knock-out Knowledge LDL Cholesterol Lipoproteins Lipoproteins Low-Density Lipoproteins Measures Mediating Mediation Mendelian randomization Mesentery Metabolic Metabolic Clearance Rate Metabolism Monoclonal Antibodies Mutation Non-Insulin-Dependent Diabetes Mellitus OGTT Oral Pakistan Participant Pathway interactions Phenocopy Phenotype Plasma Population Group Population Study Production Proteins Resources Risk Risk Factors Risk Reduction Safety Serum Testing Therapeutic Triglycerides Uncertainty Variant Very low density lipoprotein X-Ray Computed Tomography abdominal CT base case control cohort gain of function mutation gene discovery glucose tolerance heart disease risk human model improved lipid metabolism liver function loss of function loss of function mutation lymphadenopathy particle population based response therapeutic target vascular risk factor

项目摘要

Several recent studies indicate that loss of function (LoF) mutations in the ANGPTL3, 4 and 8 gene lower levels of triglyceride rich lipoproteins (TRLs) and ANGPTL3 and ANGPTL4 LoF variants offer protection from coronary heart disease (CHD). Inhibition of the ANGPTL3, 4 or 8 can therefore provide an attractive therapeutic mechanism to lower CHD risk. There are however many outstanding uncertainties that exist, pertaining to the impact of complete or partial genetic deficiency of these three proteins on: (i) the relative contribution of TRL vs LDL vs HDL in mediating CHD risk reduction; (ii) the impact on the range of apoB and apoA containing lipoproteins; (iii) the interrelationships of these three ANGPTL proteins; (iv) the dose-response relationship with CHD risk; (v) the relevance of complete or partial deficiency to glucose tolerance; and (vi) the safety implications. This proposal aims to address these gaps by leveraging natural human models of ANGPTL3, 4 and 8 deficiency, already enrolled in two population groups: (i) an Italian cohort (n = 613) that is enriched for ANGPTL3 human knockouts (n = 22); (ii) the Pakistan Genomic Resource (PGR) (n ~ 100,000) enriched for consanguinity. Specifically, in AIM-1, in 22 trios (22 ANGPTL3 null homozygous knockouts and an equal number of heterozygotes and non-carriers) from Italy, we will measure: lipoprotein particle concentration, size, and composition, relationship with ANGPTL8 and ANGPTL4 levels in fed and fasting states, metabolic parameters (e.g., oral glucose tolerance test [OGTT]), and liver function. We will also evaluate the impact of ANGPTL3 deficiency on kinetics of apoB containing lipoproteins, including VLDL apoB production rate, conversion rates of VLDL to IDL and LDL apoB, and clearance rates of VLDL, IDL, and LDL apoB. We will also assess disease mediation by using ANGPTL3 LoF genotypes and CHD risk with LDL-C, TRL and other risk factors (n = 613). In AIM-2, will leverage the Pakistani bioresource, PGR, and in 22 ANGPTL4 LoF carriers and 22 non- carriers, we will measure: lipoprotein particle concentration, size, and composition, metabolic parameters (e.g., [OGTT]), and liver function. We will also assess kinetics of TRL-apoB and HDL apoA-I containing lipoproteins through isotope traced based studies and conduct OGTT, hepatic fat quantification and abdominal CT scans to test for lymphadenopathy. We will also conduct analyses to explore relative contribution of TG, LDL-C and HDL-C in mediating CHD risk conferred by ANGPTL4 LoF through large population based studies. In AIM-3, we will measure plasma ANGPTL8 in 5,000 incident MI cases and 5,000 controls, which will enable (a) MI case-control analyses, (b) gene-discovery analyses in relation to ANGPTL8 levels, and (c) Mendelian Randomization analyses to assess causality of ANGPTL8 levels with CHD risk. In 22 ANGPTL8 LoF carriers and 22 non-carriers, we will measure OGTT and hepatic fat to assess safety profile and conduct lipoprotein kinetic studies to examine the relationship of ANGPTL8 LoF with lipid metabolism.

最近的一些研究表明，ANGPTL3、4和8基因的功能丧失（LoF）突变较低