TY - JOUR T1 - Clinical significance of copy number variations in the 11p15.5 imprinting control regions: new cases and review of the literature JF - Journal of Medical Genetics JO - J Med Genet SP - 547 LP - 553 DO - 10.1136/jmedgenet-2012-100967 VL - 49 IS - 9 AU - Matthias Begemann AU - Sabrina Spengler AU - Magdalena Gogiel AU - Ute Grasshoff AU - Michael Bonin AU - Regina C Betz AU - Andreas Dufke AU - Isabel Spier AU - Thomas Eggermann Y1 - 2012/09/01 UR - http://jmg.bmj.com/content/49/9/547.abstract N2 - Among the clusters of imprinted genes in humans, one of the most relevant regions involved in human growth is localised in 11p15. Opposite epigenetic and genomic disturbances in this chromosomal region contribute to two distinct imprinting disorders associated with disturbed growth, Silver–Russell and Beckwith–Wiedemann syndromes. Due to the complexity of the 11p15 imprinting regions and their interactions, the interpretation of the copy number variations in that region is complicated. The clinical outcome in case of microduplications or microdeletions is therefore influenced by the size, the breakpoint positions and the parental inheritance of the imbalance as well as by the imprinting status of the affected genes. Based on their own new cases and those from the literature, the authors give an overview on the genotype–phenotype correlation in chromosomal rearrangements in 11p15 as the basis for a directed genetic counselling. The detailed characterisation of patients and families helps to further delineate risk figures for syndromes associated with 11p15 disturbances. Furthermore, these cases provide us with profound insights in the complex regulation of the (imprinted) factors localised in 11p15. ER -