Polymorphism of the apolipoprotein B gene and blood lipid concentrations in Japanese and Caucasian population samples

Hiroyasu Iso, Shoji Harada, Takashi Shimamoto, Aaron R. Folsom, Kazuko Koike, Shinichi Sato, Minoru Iida, Yoshio Komachi

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13 Scopus citations

Abstract

To examine whether a racial difference in apolipoprotein B (Ape B) gene polymorphism between Japanese and American Caucasians corresponds with the lower blood cholesterol concentrations in Japanese than in Americans, we examined the EcoRI polymorphism of the Apo B gene for 271 nonsmoking men and women aged 47-69 years in two population-based samples: rural Japanese living in Akita and Caucasians living in Minneapolis-St. Paul, Minnesota, USA. Mean values of serum cholesterol concentrations were significantly lower in Japanese than in Caucasians for both men and women (difference = 25-26 mg/dl). An allele-specific polymerase chain reaction was conducted to examine the EcoRI cutting site at the 12 669 cDNA position of the Apo B gene. The allele R2 (absence of the cutting site) has been associated with lower cholesterol concentrations in two previous studies. The frequency of the R2 allele was 6% for Japanese and 17% for Caucasians (P < 0.001), and this race difference in allele frequency was identical for men and women. After controlling for age, body mass index, alcohol intake, and, for women, menopausal status and hormone replacement therapy, the adjusted mean (SE) cholesterol level among Japanese was 204 (3) mg/dl for genotype R1R1 and 185 (7) mg/dl for genotype R1R2 or R2R2 combined (P = 0.01). The respective mean values among Caucasians were 224(5) mg/dl and 232(7) mg/dl (P = 0.36). The polymorphism had a similar effect on total cholesterol concentrations for both men and women. The observed lower prevalence of the R2 allele in Japanese than in Caucasians indicates that this variation in the Apo B gene does not explain the racial difference in blood cholesterol concentrations.

Original languageEnglish (US)
Pages (from-to)233-241
Number of pages9
JournalAtherosclerosis
Volume126
Issue number2
DOIs
StatePublished - Oct 25 1996

Bibliographical note

Funding Information:
This study was supported by a contract from the Japanese Ministry of Education. The ARIC data were collected under National Heart, Lung, and Blood Institute contract N01-HC-55019. The authors thank Toshiko Suzuki for technical assistance and the following ARIC staff: Gail Murton, Linda Neal, Marilyn Nelson, Gerda Nightingale.

Keywords

  • Apo B gene
  • Blood total cholesteroI
  • Coronary risk factors
  • Cross-cultural comparison
  • Polymorphism

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