not highly genetically correlated but did share additive genetic effects20. Probable hoarding disorder and OC symptoms also shared genetic effects in another sample of adult twins19. Classifying hoarding as a distinct condition is useful in the clinic and may help in identifying hoarding-specific mechanisms. However, our results and others indicate hoarding shares considerable genetic risk with other OC trait dimensions. Disorders may share their genetic etiology even when phenotypically and clinically distinct40.
