Confirmation of BRD4 haploinsufficiency role in Cornelia de Lange–like phenotype and delineation of a 19p13.12p13.11 gene contiguous syndrome

Cornelia de Lange syndrome (CdLS) is a genetically and clinical heterogeneous condition characterized by congenital malformation, intellectual disability, and peculiar dysmorphic features. Recently, BRD4 (19p13.12) was proposed as a new critical gene associated with a mild CdLS because of a similar presentation of the patients carrying point mutations and of its involvement in the NIPBL pathway. Patients harboring a 19p interstitial deletion shared some physical features with BRD4 mutation carriers, which results in a more complex phenotype because of the involvement of several neighboring genes. We report a new 19p deletion in a patient clinically diagnosed as CdLS, partially overlapping with previously published cases with the aim to support the role of BRD4 haploinsufficiency in a CdL‐like phenotype and to improve the delineation of 19p13.12p13.11 deletion as a new nonrecurrent gene contiguous syndrome, spanning GIPC1 , NOTCH3 , BRD4 , AKAP8 , AKAP8L , CASP14 , and EPS15L1 genes. Previously described cases are reviewed, attempting to delineate a genotype–phenotype correlation.