MRC Social Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Kings College London, UK
Sri Lanka Twin Registry, Institute of Research and Development, Battaramulla, Sri Lanka and Section of Epidemiology, Institute of Psychiatry, Kings College London, UK
Sri Lanka Twin Registry, Institute of Research and Development, Battaramulla, Sri Lanka
MRC Social Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Kings College London, UK
Sydney Medical School, University of Sydney, Australia, and Department of Psychological Medicine, Institute of Psychiatry, Kings College London, UK
MRC Social Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Kings College London, UK
Department of Psychological Medicine, Institute of Psychiatry, Kings College London, UK
Correspondence: Correspondence: Harriet Ball, MRC Social Genetic and Developmental Psychiatry Centre, Institute of Psychiatry, Kings College London, De Crespigny Park, London SE5 8AF, UK. Email: harriet.ball{at}kcl.ac.uk
P.M. has received honoraria from Eli Lilly and GSK and has acted as a consultant in the recent past for GSK and Astra Zeneca. N.G. has received honoraria from Sanofi-Aventis and Servier.
Background
Susceptibility to depression results from genetic and non-familially shared environmental influences in high-income, Western countries. Environments may play a different role for populations in different contexts.
Aims
To examine heritability of depression in the first large, population-based twin study in a low-income country.
Method
Lifetime depression and a broader measure of depression susceptibility (D-probe) were assessed in 3908 adult twins in Sri Lanka (the CoTASS study).
Results
There were gender differences for the broad definition (D-probe), with a higher genetic contribution in females (61%) than males (4%). Results were similar for depression, but the prevalence was too low to estimate heritability for males.
Conclusions
Genetic influences on depression in women appear to be at least as strong in this Sri Lankan sample as in higher-income countries. Conclusions are less clear for men but suggest a larger role for environments rather than genes. The nature as well as the magnitude of environmental influences may also differ across populations.