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Polygenic risk for severe psychopathology among Europeans is associated with major depressive disorder in Han Chinese women

  • A. C. Edwards (a1) (a2), A. R. Docherty (a1) (a3), A. Moscati (a1), T. B. Bigdeli (a1) (a2), R. E. Peterson (a1) (a2), B. T. Webb (a1) (a2), S.-A. Bacanu (a1) (a2), J. M. Hettema (a1) (a2), J. Flint (a4) and K. S. Kendler (a1) (a2)...

Abstract

Background

Previous studies have demonstrated that several major psychiatric disorders are influenced by shared genetic factors. This shared liability may influence clinical features of a given disorder (e.g. severity, age at onset). However, findings have largely been limited to European samples; little is known about the consistency of shared genetic liability across ethnicities.

Method

The relationship between polygenic risk for several major psychiatric diagnoses and major depressive disorder (MDD) was examined in a sample of unrelated Han Chinese women. Polygenic risk scores (PRSs) were generated using European discovery samples and tested in the China, Oxford, and VCU Experimental Research on Genetic Epidemiology [CONVERGE (maximum N = 10 502)], a sample ascertained for recurrent MDD. Genetic correlations between discovery phenotypes and MDD were also assessed. In addition, within-case characteristics were examined.

Results

European-based polygenic risk for several major psychiatric disorder phenotypes was significantly associated with the MDD case status in CONVERGE. Risk for clinically significant indicators (neuroticism and subjective well-being) was also associated with case–control status. The variance accounted for by PRS for both psychopathology and for well-being was similar to estimates reported for within-ethnicity comparisons in European samples. However, European-based PRS were largely unassociated with CONVERGE family history, clinical characteristics, or comorbidity.

Conclusions

The shared genetic liability across severe forms of psychopathology is largely consistent across European and Han Chinese ethnicities, with little attenuation of genetic signal relative to within-ethnicity analyses. The overall absence of associations between PRS for other disorders and within-MDD variation suggests that clinical characteristics of MDD may arise due to contributions from ethnicity-specific factors and/or pathoplasticity.

Copyright

Corresponding author

*Address for correspondence: A. C. Edwards, Ph.D., Virginia Institute of Psychiatric and Behavioral Genetics, Virginia Commonwealth University, PO Box 980126, Richmond, VA 23298-0126, USA. (Email: alexis.edwards@vcuhealth.org)

Footnotes

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These authors contributed equally to this work.

Footnotes

References

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Polygenic risk for severe psychopathology among Europeans is associated with major depressive disorder in Han Chinese women

  • A. C. Edwards (a1) (a2), A. R. Docherty (a1) (a3), A. Moscati (a1), T. B. Bigdeli (a1) (a2), R. E. Peterson (a1) (a2), B. T. Webb (a1) (a2), S.-A. Bacanu (a1) (a2), J. M. Hettema (a1) (a2), J. Flint (a4) and K. S. Kendler (a1) (a2)...

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