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Relative contribution of variation within the APOC3/A4/A5 gene cluster in determining plasma triglycerides

Talmud, P. J.·2002·Human Molecular Genetics

Abstract

Since triglycerides (TG) are a major independent risk factor for coronary heart disease, understanding their genetic and environmental determinants is of major importance. Mouse models indicate an inverse relationship between levels of the newly identified apolipoprotein AV (APOAV) and TG concentrations. We have examined the relative influence of human APOA5 variants on plasma lipids, compared to the impact of variation in APOC3 and APOA4 which lie in the same cluster. Single nucleotide polymorphisms (SNPs) in APOA5 (S19W, -1131T>C) and APOA4 (T347S, Q360H) and an APOA4/A5 intergenic T>C SNP were examined in a large study of healthy middle-aged men (n=2808). APOA5 19WW and -1131CC men had 52% and 40% higher TG (P<0.003) compared to common allele homozygotes, respectively, effects which were independent and additive. APOA4 347SS men had 23% lower TG compared to TT men (P<0.002). Haplotype analysis was carried out to identify TG-raising alleles and included, in addition, four previously genotyped APOC3 SNPs (-2845T>G, -482C>T, 1100C>T, and 3238C>G). The major TG-raising alleles were defined by APOA5 W19 and APOC3 -482T. This suggests that the TG-lowering effect of APOA4 S347 might merely reflect the strong negative linkage disequilibrium with the common alleles of these variants. Thus variation in APOA5 is associated with differences in TGs in healthy men, independent of those previously reported for APOC3, while association between APOA4 and TG reflects linkage disequilibrium with these sites. The molecular mechanisms for these effects remain to be determined.

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Metadata

Authors
Talmud, P. J.
Venue
Human Molecular Genetics
Published
2002-11-15
Volume
11
Issue
24
Pages
3039-3046
ISSN
  • 0964-6906 (ISSN-L)
  • 1460-2083
OpenAlex
W2162588312
Cited by
365
References
32
FWCI
21.59
Type
journal article
Language
en
Open access
closed

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CoChat. (2026). Citation check: Relative contribution of variation within the APOC3/A4/A5 gene cluster in determining plasma triglycerides. https://app.cochat.ai/papers/10.1093/hmg/11.24.3039
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Talmud, P. J. (2002). Relative contribution of variation within the APOC3/A4/A5 gene cluster in determining plasma triglycerides. Human Molecular Genetics. https://doi.org/10.1093/hmg/11.24.3039

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