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Systematic analysis of variants related to familial hypercholesterolemia in families with premature myocardial infarction
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Systematic analysis of variants related to familial hypercholesterolemia in families with premature myocardial infarction
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Journal Article
Systematic analysis of variants related to familial hypercholesterolemia in families with premature myocardial infarction
2016
Overview
Familial hypercholesterolemia (FH) is an oligogenic disorder characterized by markedly elevated low-density lipoprotein cholesterol (LDLC) levels. Variants in four genes have been reported to cause the classical autosomal-dominant form of the disease. FH is largely under-diagnosed in European countries. As FH increases the risk for coronary artery disease (CAD) and myocardial infarction (MI), it might be specifically overlooked in the large number of such patients. Here, we systematically examined the frequency of potential FH-causing variants by exome sequencing in 255 German patients with premature MI and a positive family history for CAD. We further performed co-segregation analyses in an average of 5.5 family members per MI patient. In total, we identified 11 potential disease-causing variants that co-segregate within the families, that is, 5% of patients with premature MI and positive CAD family history had FH. Eight variants were previously reported as disease-causing and three are novel (LDLR.c.811G>A p.(V271I)), PCSK9.c.610G>A (p.(D204N)) and STAP1.c.139A>G (p.(T47A))). Co-segregation analyses identified multiple additional family members carrying one of these FH variants and the clinical phenotype of either FH (n=2) or FH and premature CAD (n=15). However, exome sequencing also revealed that some variants in FH genes, which have been reported to cause FH, do not co-segregate with FH. The data reveal that a large proportion of FH patients escape the diagnosis, even when they have premature MI. Hence, systematic molecular-genetic screening for FH in such patients may reveal a substantial number of cases and thereby allow a timely LDLC-lowering in both FH/MI patients as well as their variant-carrying family members.
Publisher
Nature Publishing Group
Subject
Adaptor Proteins, Signal Transducing - genetics
/ Adult
/ Age
/ Aged
/ Coronary Artery Disease - blood
/ Coronary Artery Disease - genetics
/ Coronary Artery Disease - pathology
/ Europe
/ Female
/ Genes
/ Genetics
/ Genomics
/ Humans
/ Hyperlipoproteinemia Type II - blood
/ Hyperlipoproteinemia Type II - genetics
/ Hyperlipoproteinemia Type II - pathology
/ Lipoprotein (low density) receptors
/ Low density lipoprotein receptors
/ Male
/ Mutation
/ Myocardial Infarction - blood
/ Myocardial Infarction - genetics
/ Myocardial Infarction - pathology
/ Patients
/ Polymorphism, Single Nucleotide
