Abstract:
:Elevated plasma LDL-cholesterol (LDL-C) levels are associated with an increased risk of coronary artery disease (CAD). Familial hypercholesterolemia (FH), a monogenic trait due to mutations in the LDL-receptor (R) gene is characterized by raised plasma LDL-C levels and premature CAD. The aim of the present investigation, derived from the study of a population of 1465 unrelated men aged 25 to 64 years, was to compare the expression of CAD assessed by coronary angiography in young (aged 25-49 years) versus middle-aged (50-64 years) heterozygous FH patients of French Canadian descent. Furthermore, the relationship of binding-defective versus receptor negative mutations in the LDL-R to premature CAD ( < 50 years) was examined and compared with men displaying a normal plasma lipoprotein-lipid profile. From the original study sample, a total of 100 men met the clinical criteria of heterozygous FH. Among them, 30 were carriers of a receptor negative mutation (deletion > 15 kb or point mutations Y468X or R329X) whereas 64 were carriers of a receptor defective mutation (W66G, E207K or C646Y). As expected, in both age groups (25-49 years vs. 50-64 years), carriers of a receptor negative mutation had higher plasma cholesterol and LDL-C levels than carriers of a defective allele or men with a normal plasma lipoprotein-lipid profile. In addition, the mean number of diseased vessels (with > 50% stenosis) was higher in men aged 50-64 years compared to those aged 25 49 years. In the two age groups, FH patients were characterized by a higher number of stenosed coronary vessels than the normal phenotype group. Within each group (either receptor negative, receptor defective or normal phenotype) plasma cholesterol, LDL-C, HDL-C, triglyceride and apolipoprotein B levels were similar irrespective of age (25 49 years vs. 50-64 years). Finally, multiple logistic regression analyses revealed that compared to non-FH men, the relative odds of being affected by CAD before the age of 50 years was 7.3-fold higher for carriers of a receptor negative mutation and 2.7-fold higher for men with a receptor defective mutation at the LDL-R locus. These results suggest that CAD could be an earlier event among heterozygous FH subjects bearing a receptor negative mutation compared to LDL-R defective patients. It also suggest that the selective screening for mutations in the LDL-R gene may allow a better assessment of the individual risk and facilitate the development of family-based preventive strategies or intervention programs in FH.
journal_name
Atherosclerosisjournal_title
Atherosclerosisauthors
Gaudet D,Vohl MC,Couture P,Moorjani S,Tremblay G,Perron P,Gagné C,Després JPdoi
10.1016/s0021-9150(98)00268-8keywords:
subject
Has Abstractpub_date
1999-03-01 00:00:00pages
153-61issue
1eissn
0021-9150issn
1879-1484pii
S0021-9150(98)00268-8journal_volume
143pub_type
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