Heritability of endometriosis
Genetic and unique environmental influences on the etiology of endometriosis further strengthen the conclusion that genes have a strong influence on the phenotypic manifestations of endometriosis.
Rama Saha, M.D., Hans Järnbert Pettersson, Ph.D., Pia Svedberg, Ph.D., Matts Olovsson, Ph.D., Agneta Bergqvist, Ph.D., Lena Marions, Ph.D., Per Tornvall, Ph.D., Ralf Kuja-Halkola, Ph.D.
Volume 104, Issue 4, Pages 947-952
To estimate the relative contribution of genetic influences and prevalence on endometriosis.
Analysis of self-reported data from a nationwide population-based twin registry.
In total 28,370 women, female monozygotic (MZ) or dizygotic (DZ) twins, who participated in either of two surveys (1998–2002 or 2005–2006).
Main Outcome Measure(s):
Self-reported endometriosis, validated by medical records.
A history of endometriosis was reported by 1,228 female twins. The probandwise concordance was 0.21 for MZ and 0.10 for DZ twins. Higher within-pair (tetrachoric) correlation was observed among MZ (0.47) compared with DZ (0.20) twins. The best-fitting model revealed a contribution of 47% by additive genetic factors and the remaining 53% attributed to unique environmental effects.
Our findings suggest both genetic and unique (nonshared) environmental influences on the complex etiology of endometriosis and support the hypothesis that genes have a strong influence on phenotypic manifestations of endometriosis.