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J Am Coll Cardiol, 2008; 51:444-448, doi:10.1016/j.jacc.2007.09.044
© 2008 by the American College of Cardiology Foundation
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CLINICAL RESEARCH: GENETICS AND CORONARY ARTERY DISEASE

A Kinesin Family Member 6 Variant Is Associated With Coronary Heart Disease in the Women’s Health Study

Dov Shiffman, PhD*,1,2,*, Daniel I. Chasman, PhD{dagger},2, Robert Y.L. Zee, PhD*, Olga A. Iakoubova, MD, PhD*,1, Judy Z. Louie, BA*,1, James J. Devlin, PhD*,1 and Paul M. Ridker, MD{dagger},{ddagger}

* Celera, Alameda, California
{dagger} Division of Preventive Medicine, Center for Cardiovascular Disease Prevention, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts
{ddagger} Division of Cardiology, Center for Cardiovascular Disease Prevention, Brigham and Women’s Hospital and Harvard Medical School, Boston, Massachusetts.

Manuscript received June 13, 2007; revised manuscript received August 27, 2007, accepted September 17, 2007.

* Reprint requests and correspondence: Dr. Dov Shiffman, Celera, 1401 Harbor Bay Parkway, Alameda, California 94502. (Email: dov.shiffman{at}celera.com).

Objectives: We asked if carriers of the 719Arg allele of kinesin family member 6 (KIF6) have increased risk of coronary heart disease (CHD) in a cohort of initially healthy Caucasian American women.

Background: The 719Arg allele of KIF6 (rs20455) has been reported to be associated with increased risk of CHD in a large population-based prospective study, ARIC (Atherosclerosis Risk in Communities), and in the placebo arms of 2 statin trials, CARE (Cholesterol and Recurrent Events) and WOSCOPS (West of Scotland Coronary Prevention Study). However, this KIF6 variant was not specifically investigated in the female subgroup in the ARIC study, and the CARE and WOSCOPS trials included only a small number of female patients.

Methods: Genotypes of the rs20455 single nucleotide polymorphism (SNP) were determined among 25,283 initially healthy Caucasian women, age 45 years and older, participating in the WHS (Women’s Health Study) who were prospectively followed over a 12-year period for incident cardiovascular events. The risk associated with the 719Arg allele of KIF6 was estimated using Cox proportional hazards models that adjusted for age and traditional risk factors.

Results: During follow-up, 953 women suffered a first-ever CHD event (myocardial infarction, coronary revascularization, or cardiovascular death) or first-ever ischemic stroke. Compared with noncarriers, carriers of the 719Arg allele had an increased risk of CHD (hazard ratio [HR] = 1.24 [95% confidence interval (CI) 1.04 to 1.46, p = 0.013]) and myocardial infarction (HR = 1.34 [95% CI 1.02 to 1.75, p = 0.034]) but not ischemic stroke.

Conclusions: Confirming and extending previous reports, carriers of the 719Arg allele of KIF6 have 34% higher risk of myocardial infarction and 24% higher risk of CHD compared with noncarriers among 25,283 women from the WHS.

Abbreviations and Acronyms
  CHD = coronary heart disease
  HDL-C = high-density lipoprotein cholesterol
  HWE = Hardy-Weinberg equilibrium
  LDL-C = low-density lipoprotein cholesterol
  Lp(a) = lipoprotein(a)
  MI = myocardial infarction


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