Related Experiment Videos
Genetic influences on endometriosis in an Australian twin sample. sueT@qimr.edu.au
S A Treloar1, D T O'Connor, V M O'Connor
1Cooperative Research Centre for Discovery of Genes for Common Human Diseases, Queensland Institute of Medical Research, Brisbane, Australia. sueT@qimr.edu.au
Objective:
To investigate the prevalence of and twin pair concordance for endometriosis.
Design:
A questionnaire survey incorporating validation.
Setting:
An Australia-wide volunteer sample of female monozygotic (MZ) and dizygotic (DZ) twin pairs from the Australian National Health and Medical Research Council Twin Register.
Patient(S):
Twins were selected only on the basis of previous participation in twin research.
Intervention(S):
Questionnaires were sent to 3,298 individuals. Information was requested from physicians named by consenting twins.
Main Outcome Measure(S):
Reported endometriosis, validated where possible by pathology or surgical report.
Result(S):
Three thousand ninety-six (94%) of the twins and 145 (82%) of the physicians responded to the survey. Two hundred fifteen twins reported endometriosis, for a prevalence rate of .07 among question respondents. Tetrachoric twin pair correlations for self-reported endometriosis (MZ: n = 854 and DZ: n = 493) were rMz = .46+/-.09 and rDz = .28 +/-.13. When available medical and pathology reports were included, they changed to rMz =.52 +/-.08 and rDZ = .19+/-.16, suggesting that 51% of the variance of the latent liability to endometriosis may be attributable to additive genetic influences.
Conclusion(S):
These findings support the hypothesis that genes influence liability to endometriosis.