Linkage of left ventricular contractility to chromosome 11 in humans: The HyperGEN Study

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D K Arnett1, R B Devereux, D Kitzman

  • 1Division of Epidemiology, University of Minnesota, Minneapolis, USA. arnett@epi.umn.edu

Hypertension (Dallas, Tex. : 1979)
|October 20, 2001
PubMed

Insights

Researchers identified a significant gene linkage on chromosome 11 associated with impaired left ventricular (LV) contractility in Black individuals. This finding may reveal genetic factors contributing to heart failure and cardiovascular death.

Area of Science:

  • Cardiovascular Genetics
  • Human Genetics
  • Molecular Cardiology

Background:

  • Impaired left ventricular (LV) contractility is a primary driver of cardiovascular mortality, particularly congestive heart failure.
  • Identifying genetic susceptibility factors is crucial for understanding the mechanisms of LV contractile dysfunction and heart failure development.

Purpose of the Study:

  • To identify genes contributing to impaired left ventricular contractility using a large, biethnic sample of hypertensive siblings.
  • To investigate the genetic underpinnings of left ventricular contractile function in relation to cardiovascular health.

Main Methods:

  • Echocardiographic measurements of myocardial contractility were collected from hypertensive siblings within the Hypertension Genetic Epidemiology Network (HyperGEN).
  • Multipoint variance components linkage analysis was performed using GENEHUNTER2 and 387 anonymous markers.
  • Statistical adjustments were made for gender, age, and age squared, with standardized residuals calculated separately for men and women in both ethnic groups.

Main Results:

  • Significant linkage (lod, 3.93) was detected for marker D11S1993 on chromosome 11 in Black individuals, accounting for 72% of LV contractility variation.
  • Suggestive evidence for linkage (lod, 2.83) was found on chromosome 22 in White individuals.
  • The chromosome 11 linkage region is near the myosin-binding protein C gene, known to be associated with familial hypertrophic cardiomyopathy.

Conclusions:

  • A specific region on chromosome 11 shows strong genetic linkage with left ventricular contractility in Black populations.
  • This region likely harbors a critical gene influencing impaired left ventricular contractility.
  • Further research into this chromosomal region may uncover novel therapeutic targets for heart failure.

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