RT Journal Article T1 Variable Penetrance of the 15q11.2 BP1-BP2 Microduplication in a Family with Cognitive and Language Impairment. A1 Benítez-Burraco, Antonio A1 Barcos-Martínez, Montserrat A1 Espejo-Portero, Isabel A1 Jiménez-Romero, Salud K1 Cognitive delay K1 Copy number variations K1 Language impairment K1 Microduplication 15q11.2 BP1–BP2 K1 Variable penetrance AB The 15q11.2 BP1-BP2 region is found duplicated or deleted in people with cognitive, language, and behavioral impairment. We report on a family (a father and 3 male twin siblings) that presents with a duplication of the 15q11.2 BP1-BP2 region and a variable phenotype: the father and the fraternal twin are normal carriers, whereas the monozygotic twins exhibit severe language and cognitive delay as well as behavioral disturbances. The genes located within the duplicated region are involved in brain development and function, and some of them are related to language processing. The probands' phenotype may result from changes in the expression level of some of these genes important for cognitive development. SN 1661-8769 YR 2017 FD 2017-04-14 LK https://hdl.handle.net/10668/25047 UL https://hdl.handle.net/10668/25047 LA en DS RISalud RD Apr 5, 2025