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Genome-wide linkage scan for exercise stroke volume and cardiac output in the HERITAGE Family Study

¹ Pennington Biomedical Research Center, Human Genomics Laboratory, Baton Rouge, Louisiana 70808
² Division of Biostatistics, Washington University School of Medicine, St. Louis 63110
³ Physical Activity Sciences Laboratory, Laval University, Ste-Foy G1K 7P4
⁴ Laboratory of Molecular Endocrinology, Laval University, Ste-Foy, Quebec, Canada G1V 4G2
⁵ School of Kinesiology and Leisure Studies, University of Minnesota, Minneapolis, Minnesota 55455
⁶ Department of Kinesiology, Indiana University, Bloomington, Indiana 46405
⁷ Department of Health and Kinesiology, Texas A & M University, College Station, Texas 77843-4243
⁸ Departments of Genetics and Psychiatry, Washington University School of Medicine, St. Louis, Missouri 63110-1093

A genome-wide linkage scan was performed for genes affecting submaximal exercise cardiac output (Q) and stroke volume (SV) in the sedentary state and their responses to a standardized 20-wk endurance training program. A total of 509 polymorphic markers were used, and 328 pairs of siblings from 99 white nuclear families and 102 sibling pairs from 105 black family units were available. Q and SV were measured in relative steady state during exercise at 50 W (Q50 and SV50, respectively). Baseline phenotypes were adjusted for age, sex, and body surface area (BSA), and the training responses (post-training - baseline, ) were adjusted for age, sex, baseline BSA, and baseline value of the phenotype. Three analytical strategies were used: a multipoint variance components linkage analysis using all the family data, and regression-based single- and multipoint linkage analyses using pairs of siblings. In whites, baseline SV50 and SV50 showed promising linkages (P < 0.0023) with markers on chromosomes 14q31.1 and 10p11.2, respectively. Suggestive evidence of linkage (0.01 > P > 0.0023) for SV50 and Q50 was detected on chromosome 2q31.1 and for baseline SV50 and Q50 on chromosome 9q32-q33. In blacks, markers on 18q11.2 showed promising linkages with baseline Q50. Suggestive evidence of linkage was found in three regions for baseline SV50 (1p21.3, 3q13.3, 12q13.2) and one for baseline SV50 and Q50 (10p14). All these chromosomal regions include several potential candidate genes and therefore warrant further studies in the HERITAGE cohort and other studies.

genomic scan; exercise training; linkage analysis

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