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Jelenkovic, Aline,Yokoyama, Yoshie,Sund, Reijo,Honda, Chika,Bogl, Leonie H,Aaltonen, Sari,Ji, Fuling,Ning, Feng,Pang, Zengchang,Ordoñ,ana, Juan R.,Sá,nchez-Romera, Juan F.,Colodro-Conde, L Cambridge University Press 2015 TWIN RESEARCH AND HUMAN GENETICS - Vol.18 No.5
<P>A trend toward greater body size in dizygotic (DZ) than in monozygotic (MZ) twins has been suggested by some but not all studies, and this difference may also vary by age. We analyzed zygosity differences in mean values and variances of height and body mass index (BMI) among male and female twins from infancy to old age. Data were derived from an international database of 54 twin cohorts participating in the COllaborative project of Development of Anthropometrical measures in Twins (CODATwins), and included 842,951 height and BMI measurements from twins aged 1 to 102 years. The results showed that DZ twins were consistently taller than MZ twins, with differences of up to 2.0 cm in childhood and adolescence and up to 0.9 cm in adulthood. Similarly, a greater mean BMI of up to 0.3 kg/m<SUP>2</SUP> in childhood and adolescence and up to 0.2 kg/m<SUP>2</SUP> in adulthood was observed in DZ twins, although the pattern was less consistent. DZ twins presented up to 1.7% greater height and 1.9% greater BMI than MZ twins; these percentage differences were largest in middle and late childhood and decreased with age in both sexes. The variance of height was similar in MZ and DZ twins at most ages. In contrast, the variance of BMI was significantly higher in DZ than in MZ twins, particularly in childhood. In conclusion, DZ twins were generally taller and had greater BMI than MZ twins, but the differences decreased with age in both sexes.</P>
Yokoyama, Yoshie,Jelenkovic, Aline,Sund, Reijo,Sung, Joohon,Hopper, John L.,Ooki, Syuichi,Heikkilä,, Kauko,Aaltonen, Sari,Tarnoki, Adam D.,Tarnoki, David L.,Willemsen, Gonneke,Bartels, Meike,van B Cambridge University Press 2016 TWIN RESEARCH AND HUMAN GENETICS - Vol.19 No.2
<P>We analyzed birth order differences in means and variances of height and body mass index (BMI) in monozygotic (MZ) and dizygotic (DZ) twins from infancy to old age. The data were derived from the international CODATwins database. The total number of height and BMI measures from 0.5 to 79.5 years of age was 397,466. As expected, first-born twins had greater birth weight than second-born twins. With respect to height, first-born twins were slightly taller than second-born twins in childhood. After adjusting the results for birth weight, the birth order differences decreased and were no longer statistically significant. First-born twins had greater BMI than the second-born twins over childhood and adolescence. After adjusting the results for birth weight, birth order was still associated with BMI until 12 years of age. No interaction effect between birth order and zygosity was found. Only limited evidence was found that birth order influenced variances of height or BMI. The results were similar among boys and girls and also in MZ and DZ twins. Overall, the differences in height and BMI between first- and second-born twins were modest even in early childhood, while adjustment for birth weight reduced the birth order differences but did not remove them for BMI.</P>
Silventoinen, Karri,Jelenkovic, Aline,Sund, Reijo,Yokoyama, Yoshie,Hur, Yoon-Mi,Cozen, Wendy,Hwang, Amie E,Mack, Thomas M,Honda, Chika,Inui, Fujio,Iwatani, Yoshinori,Watanabe, Mikio,Tomizawa, Rie,Piet American Society for Clinical Nutrition 2017 The American journal of clinical nutrition Vol.106 No.2
<P><B>Background:</B> Genes and the environment contribute to variation in adult body mass index [BMI (in kg/m<SUP>2</SUP>)], but factors modifying these variance components are poorly understood.</P><P><B>Objective:</B> We analyzed genetic and environmental variation in BMI between men and women from young adulthood to old age from the 1940s to the 2000s and between cultural-geographic regions representing high (North America and Australia), moderate (Europe), and low (East Asia) prevalence of obesity.</P><P><B>Design:</B> We used genetic structural equation modeling to analyze BMI in twins ≥20 y of age from 40 cohorts representing 20 countries (140,379 complete twin pairs).</P><P><B>Results:</B> The heritability of BMI decreased from 0.77 (95% CI: 0.77, 0.78) and 0.75 (95% CI: 0.74, 0.75) in men and women 20–29 y of age to 0.57 (95% CI: 0.54, 0.60) and 0.59 (95% CI: 0.53, 0.65) in men 70–79 y of age and women 80 y of age, respectively. The relative influence of unique environmental factors correspondingly increased. Differences in the sets of genes affecting BMI in men and women increased from 20–29 to 60–69 y of age. Mean BMI and variances in BMI increased from the 1940s to the 2000s and were greatest in North America and Australia, followed by Europe and East Asia. However, heritability estimates were largely similar over measurement years and between regions. There was no evidence of environmental factors shared by co-twins affecting BMI.</P><P><B>Conclusions:</B> The heritability of BMI decreased and differences in the sets of genes affecting BMI in men and women increased from young adulthood to old age. The heritability of BMI was largely similar between cultural-geographic regions and measurement years, despite large differences in mean BMI and variances in BMI. Our results show a strong influence of genetic factors on BMI, especially in early adulthood, regardless of the obesity level in the population.</P>
Silventoinen, Karri,Jelenkovic, Aline,Sund, Reijo,Hur, Yoon-Mi,Yokoyama, Yoshie,Honda, Chika,Hjelmborg, Jacob vB,Moller, Soren,Ooki, Syuichi,Aaltonen, Sari,Ji, Fuling,Ning, Feng,Pang, Zengchang,Rebato American Society for Clinical Nutrition 2016 The American journal of clinical nutrition Vol.104 No.2
<P>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.</P>
Branka D. Muric,Dejan V. Pantelic,Darko M. Vasiljevic,Svetlana N. Savic-Sevic,Branislav M. Jelenkovic 한국물리학회 2016 Current Applied Physics Vol.16 No.1
The optical limiting properties of tot'hema and eosin sensitized gelatin layer (short TESG) under continuous second harmonic Nd:YAG laser light were investigated. In contrast to classical eye protection filters the microlens formation and carbonization in TESG are the main mechanisms for eye protection from direct laser radiation. Results have shown that safety goggles made on TESG can protect the eye from up to 10 W of incident laser power. Filters for other wavelengths can be manufactured by varying the sensitizer.