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. 2016 Aug;104(2):371-9.
doi: 10.3945/ajcn.116.130252. Epub 2016 Jul 13.

Genetic and environmental effects on body mass index from infancy to the onset of adulthood: an individual-based pooled analysis of 45 twin cohorts participating in the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins) study

Karri Silventoinen  1 Aline Jelenkovic  2 Reijo Sund  3 Yoon-Mi Hur  4 Yoshie Yokoyama  5 Chika Honda  6 Jacob vB Hjelmborg  7 Sören Möller  7 Syuichi Ooki  8 Sari Aaltonen  9 Fuling Ji  10 Feng Ning  10 Zengchang Pang  10 Esther Rebato  11 Andreas Busjahn  12 Christian Kandler  13 Kimberly J Saudino  14 Kerry L Jang  15 Wendy Cozen  16 Amie E Hwang  17 Thomas M Mack  16 Wenjing Gao  18 Canqing Yu  18 Liming Li  18 Robin P Corley  19 Brooke M Huibregtse  19 Kaare Christensen  20 Axel Skytthe  7 Kirsten O Kyvik  21 Catherine A Derom  22 Robert F Vlietinck  23 Ruth Jf Loos  24 Kauko Heikkilä  25 Jane Wardle  26 Clare H Llewellyn  26 Abigail Fisher  26 Tom A McAdams  27 Thalia C Eley  28 Alice M Gregory  29 Mingguang He  30 Xiaohu Ding  31 Morten Bjerregaard-Andersen  32 Henning Beck-Nielsen  33 Morten Sodemann  34 Adam D Tarnoki  35 David L Tarnoki  35 Maria A Stazi  36 Corrado Fagnani  36 Cristina D'Ippolito  36 Ariel Knafo-Noam  37 David Mankuta  38 Lior Abramson  37 S Alexandra Burt  39 Kelly L Klump  39 Judy L Silberg  40 Lindon J Eaves  40 Hermine H Maes  41 Robert F Krueger  42 Matt McGue  42 Shandell Pahlen  42 Margaret Gatz  43 David A Butler  44 Meike Bartels  45 Toos Cem van Beijsterveldt  45 Jeffrey M Craig  46 Richard Saffery  46 Duarte L Freitas  47 José Antonio Maia  48 Lise Dubois  49 Michel Boivin  50 Mara Brendgen  51 Ginette Dionne  52 Frank Vitaro  53 Nicholas G Martin  54 Sarah E Medland  54 Grant W Montgomery  55 Youngsook Chong  56 Gary E Swan  57 Ruth Krasnow  58 Patrik Ke Magnusson  59 Nancy L Pedersen  59 Per Tynelius  60 Paul Lichtenstein  59 Claire Ma Haworth  61 Robert Plomin  28 Gombojav Bayasgalan  62 Danshiitsoodol Narandalai  63 K Paige Harden  64 Elliot M Tucker-Drob  64 Sevgi Y Öncel  65 Fazil Aliev  66 Timothy Spector  67 Massimo Mangino  67 Genevieve Lachance  67 Laura A Baker  68 Catherine Tuvblad  69 Glen E Duncan  70 Dedra Buchwald  71 Gonneke Willemsen  45 Finn Rasmussen  60 Jack H Goldberg  72 Thorkild Ia Sørensen  73 Dorret I Boomsma  45 Jaakko Kaprio  74
Affiliations

Genetic and environmental effects on body mass index from infancy to the onset of adulthood: an individual-based pooled analysis of 45 twin cohorts participating in the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins) study

Karri Silventoinen et al. Am J Clin Nutr. 2016 Aug.

Abstract

Background: Both genetic and environmental factors are known to affect body mass index (BMI), but detailed understanding of how their effects differ during childhood and adolescence is lacking.

Objectives: We analyzed the genetic and environmental contributions to BMI variation from infancy to early adulthood and the ways they differ by sex and geographic regions representing high (North America and Australia), moderate (Europe), and low levels (East Asia) of obesogenic environments.

Design: Data were available for 87,782 complete twin pairs from 0.5 to 19.5 y of age from 45 cohorts. Analyses were based on 383,092 BMI measurements. Variation in BMI was decomposed into genetic and environmental components through genetic structural equation modeling.

Results: The variance of BMI increased from 5 y of age along with increasing mean BMI. The proportion of BMI variation explained by additive genetic factors was lowest at 4 y of age in boys (a(2) = 0.42) and girls (a(2) = 0.41) and then generally increased to 0.75 in both sexes at 19 y of age. This was because of a stronger influence of environmental factors shared by co-twins in midchildhood. After 15 y of age, the effect of shared environment was not observed. The sex-specific expression of genetic factors was seen in infancy but was most prominent at 13 y of age and older. The variance of BMI was highest in North America and Australia and lowest in East Asia, but the relative proportion of genetic variation to total variation remained roughly similar across different regions.

Conclusions: Environmental factors shared by co-twins affect BMI in childhood, but little evidence for their contribution was found in late adolescence. Our results suggest that genetic factors play a major role in the variation of BMI in adolescence among populations of different ethnicities exposed to different environmental factors related to obesity.

Keywords: BMI; children; genetics; international comparisons; twins.

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Figures

FIGURE 1
FIGURE 1
Proportions of natural logarithm of BMI variation with 95% CIs based on maximum likelihood estimation explained by additive genetic, shared environmental, and unique environmental factors by age and sex. The number of twin pairs varied from 2987 at 6 y of age to 17,028 at 3 y of age. Additive genetic factors in boys (A); additive genetic factors in girls (B); shared environmental factors in boys (C); shared environmental factors in girls (D); specific environmental factors in boys (E); specific environmental factors in girls (F).
FIGURE 2
FIGURE 2
Additive genetic correlations with 95% CIs based on maximum likelihood estimation within opposite-sex dizygotic pairs by age. The number of opposite-sex pairs varied from 753 at 6 y of age to 5272 at 3 y of age.
FIGURE 3
FIGURE 3
Proportions of natural logarithm of BMI variation with 95% CIs based on maximum likelihood estimation explained by additive genetic factors by age, sex, and region for European boys (A), European girls (B), North American and Australian boys (C), North American and Australian girls (D), East Asian boys (E), and East Asian girls (F). The number of twin pairs varied from 1107 at 6 y of age to 13,855 at 3 y of age in Europe, from 565 at 1 y of age to 5064 at 18 y of age in North America and Australia, and from 111 at 17 y of age to 2284 at 1 y of age in East Asia.

Comment in

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