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Am J Med Genet A ; 191(8): 2113-2131, 2023 08.
Article in English | MEDLINE | ID: mdl-37377026

ABSTRACT

Cornelia de Lange Syndrome (CdLS) is a rare, dominantly inherited multisystem developmental disorder characterized by highly variable manifestations of growth and developmental delays, upper limb involvement, hypertrichosis, cardiac, gastrointestinal, craniofacial, and other systemic features. Pathogenic variants in genes encoding cohesin complex structural subunits and regulatory proteins (NIPBL, SMC1A, SMC3, HDAC8, and RAD21) are the major pathogenic contributors to CdLS. Heterozygous or hemizygous variants in the genes encoding these five proteins have been found to be contributory to CdLS, with variants in NIPBL accounting for the majority (>60%) of cases, and the only gene identified to date that results in the severe or classic form of CdLS when mutated. Pathogenic variants in cohesin genes other than NIPBL tend to result in a less severe phenotype. Causative variants in additional genes, such as ANKRD11, EP300, AFF4, TAF1, and BRD4, can cause a CdLS-like phenotype. The common role that these genes, and others, play as critical regulators of developmental transcriptional control has led to the conditions they cause being referred to as disorders of transcriptional regulation (or "DTRs"). Here, we report the results of a comprehensive molecular analysis in a cohort of 716 probands with typical and atypical CdLS in order to delineate the genetic contribution of causative variants in cohesin complex genes as well as novel candidate genes, genotype-phenotype correlations, and the utility of genome sequencing in understanding the mutational landscape in this population.


Subject(s)
De Lange Syndrome , Nuclear Proteins , Humans , Nuclear Proteins/genetics , De Lange Syndrome/diagnosis , De Lange Syndrome/genetics , De Lange Syndrome/pathology , Transcription Factors/genetics , Cell Cycle Proteins/genetics , Phenotype , Mutation , Genomics , Genetic Association Studies , Transcriptional Elongation Factors/genetics , Histone Deacetylases/genetics , Repressor Proteins/genetics
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