Assortative mating and parental genetic relatedness contribute to the pathogenicity of variably expressive variants. - Smolen C; Jensen M; Dyer L; Pizzo L; Tyryshkina A; Banerjee D; Rohan L; Huber E; El Khattabi L; Prontera P; Caberg JH; Van Dijck A; et al. (American journal of human genetics, 2023)