Heritability of optic disc diameters: a twin study
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Heritability of optic disc diameters: a twin study. / Drobnjak, Dragana; Taarnhøj, Nina Charlotte; Mitchell, Paul; Wang, Jie J; Tan, Ava; Kessel, Line; Hougaard, Jesper; Sørensen, Thorkild I A; Larsen, Michael.
I: Acta Ophthamologica (Online), Bind 89, Nr. 2, 01.03.2011, s. e193-8.Publikation: Bidrag til tidsskrift › Tidsskriftartikel › Forskning
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TY - JOUR
T1 - Heritability of optic disc diameters: a twin study
AU - Drobnjak, Dragana
AU - Taarnhøj, Nina Charlotte
AU - Mitchell, Paul
AU - Wang, Jie J
AU - Tan, Ava
AU - Kessel, Line
AU - Hougaard, Jesper
AU - Sørensen, Thorkild I A
AU - Larsen, Michael
N1 - © 2010 The Authors. Journal compilation © 2010 Acta Ophthalmol.
PY - 2011/3/1
Y1 - 2011/3/1
N2 - Purpose: To assess the relative influence of genetic and environmental factors on optic disc size and cup/disc ratio in healthy eyes. Methods: A sample of 55 monozygotic and 50 dizygotic healthy twin pairs aged 20-46, all having the same sex within pairs (47 pairs were male) had optic discs measured from colour fundus photographs according to the Wisconsin Protocol. Structural equation modelling was used to estimate the relative contribution of genetic and environmental factors to the phenotype. Results: Disc dimensions did not vary significantly by age or sex. After adjusting for age and sex, additive genetic factors (i.e. heritability) explained 77% (95% CI: 65-85%) of variation of vertical disc diameters, whereas estimated unshared environmental effect was 23% (95% CI: 15-35%). For vertical cup diameters, heritability accounted for 70% (95% CI: 55-80%) and environmental factors 30% (95% CI: 20-45%). For cup/disc ratio, additive genetic and unshared environmental factors explained 66% (95% CI: 48-77%) and 34% (95% CI: 23-52%) of the variations, respectively. Discussion: In this healthy twin sample, we found that three quarters of the variations in vertical optic disc and optic cup diameters were attributable to genetic influence.
AB - Purpose: To assess the relative influence of genetic and environmental factors on optic disc size and cup/disc ratio in healthy eyes. Methods: A sample of 55 monozygotic and 50 dizygotic healthy twin pairs aged 20-46, all having the same sex within pairs (47 pairs were male) had optic discs measured from colour fundus photographs according to the Wisconsin Protocol. Structural equation modelling was used to estimate the relative contribution of genetic and environmental factors to the phenotype. Results: Disc dimensions did not vary significantly by age or sex. After adjusting for age and sex, additive genetic factors (i.e. heritability) explained 77% (95% CI: 65-85%) of variation of vertical disc diameters, whereas estimated unshared environmental effect was 23% (95% CI: 15-35%). For vertical cup diameters, heritability accounted for 70% (95% CI: 55-80%) and environmental factors 30% (95% CI: 20-45%). For cup/disc ratio, additive genetic and unshared environmental factors explained 66% (95% CI: 48-77%) and 34% (95% CI: 23-52%) of the variations, respectively. Discussion: In this healthy twin sample, we found that three quarters of the variations in vertical optic disc and optic cup diameters were attributable to genetic influence.
U2 - 10.1111/j.1755-3768.2010.01923.x
DO - 10.1111/j.1755-3768.2010.01923.x
M3 - Journal article
C2 - 20636443
VL - 89
SP - e193-8
JO - Acta Ophthalmologica
JF - Acta Ophthalmologica
SN - 1755-375X
IS - 2
ER -
ID: 34072372