TY - JOUR
T1 - Heritability of longitudinal measures of body mass index and lipid and lipoprotein levels in aging twins
AU - Goode, Ellen L.
AU - Cherny, Stacey S.
AU - Christian, Joe C.
AU - Jarvik, Gail P.
AU - De Andrade, Mariza
N1 - Funding Information:
Major support was provided by the Mayo Foundation, the National Institutes of Health, and the National Heart, Lung, and Blood Institute through contracts NO1 HC-55023, HC-55027, HC-55028, HC-55029, and HC-65039, and grants HL-30086, HL-41830, and HL-46880. SSC is supported in part by NIH grant EY-12562. The authors thank Drs. Richard Fabsitz and Terry Reed for enabling this project, and Drs. Beth Newman, Joseph Selby, and Melissa Austin for their help in facilitating the collaboration.
PY - 2007/10
Y1 - 2007/10
N2 - Body-mass index (BMI), total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), and triglyceride (TG) levels are known to be highly heritable. We evaluated the genetic and environmental relationships of these measures over time in an analysis of twin pairs. Monozygotic (235 pairs) and dizygotic (260 pairs) male twins were participants in the National Heart Lung and Blood Institute Veteran Twin Study, and were followed with three clinical exams from mean age 48 years to mean age 63 years. Structural equation modeling (SEM) with adjustment for APOE genotype (a significant contributor to TC and LDL-C) was used to assess longitudinal patterns of heritability. Results indicated a contribution of genetic factors to BMI, TC, LDL-C, HLD-C, and TG. Modest increases over time were observed in the heritability of BMI (from 0.48 to 0.61), TC (from 0.46 to 0.57), LDL-C (from 0.49 to 0.64), and HDL-C (from 0.50 to 0.62), but this trend was not present for TG. There was a corresponding decrease in shared environmental influences over time for these traits, although shared environment was a significant contributor only for HDL-C. Moreover, we observed that genetic influences for all measures were significantly correlated over time, and we found no evidence of age-specific genetic effects. In summary, longitudinal analyses of twin data indicate that genetic factors do not account for a significant proportion of the variation in age-related changes of BMI or lipid and lipoprotein levels.
AB - Body-mass index (BMI), total cholesterol (TC), low-density lipoprotein cholesterol (LDL-C), high-density lipoprotein cholesterol (HDL-C), and triglyceride (TG) levels are known to be highly heritable. We evaluated the genetic and environmental relationships of these measures over time in an analysis of twin pairs. Monozygotic (235 pairs) and dizygotic (260 pairs) male twins were participants in the National Heart Lung and Blood Institute Veteran Twin Study, and were followed with three clinical exams from mean age 48 years to mean age 63 years. Structural equation modeling (SEM) with adjustment for APOE genotype (a significant contributor to TC and LDL-C) was used to assess longitudinal patterns of heritability. Results indicated a contribution of genetic factors to BMI, TC, LDL-C, HLD-C, and TG. Modest increases over time were observed in the heritability of BMI (from 0.48 to 0.61), TC (from 0.46 to 0.57), LDL-C (from 0.49 to 0.64), and HDL-C (from 0.50 to 0.62), but this trend was not present for TG. There was a corresponding decrease in shared environmental influences over time for these traits, although shared environment was a significant contributor only for HDL-C. Moreover, we observed that genetic influences for all measures were significantly correlated over time, and we found no evidence of age-specific genetic effects. In summary, longitudinal analyses of twin data indicate that genetic factors do not account for a significant proportion of the variation in age-related changes of BMI or lipid and lipoprotein levels.
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U2 - 10.1375/twin.10.5.703
DO - 10.1375/twin.10.5.703
M3 - Article
C2 - 17903110
AN - SCOPUS:35348945773
SN - 1832-4274
VL - 10
SP - 703
EP - 711
JO - Twin Research and Human Genetics
JF - Twin Research and Human Genetics
IS - 5
ER -