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Truncating Variants in RREB1 Cause a Novel RASopathy Syndrome of Congenital Heart Disease, Genitourinary
Alanna Strong1,2,3, Caoimhe McKenna4, Karen Stals5
1Division of Human Genetics, Children's Hospital of Philadelphia, Philadelphia, Pennsylvania, USA.
None:
The interstitial 6p microdeletion syndrome is characterized by dysmorphic facies and structural heart, kidney, brain, and musculoskeletal differences. RREB1 haploinsufficiency and consequent abnormal RAS-MAPK pathway signaling have been proposed as a driver of the disease phenotype; however, apart from a single case report, the phenotype of intragenic RREB1 variants is unknown. Here we present a cohort of 6 individuals with truncating RREB1 variants. Phenotypes include mild dysmorphisms, congenital heart disease, genitourinary malformations, dental anomalies, and developmental delay. Our data support RREB1 as a currently under-recognized cause of a RASopathy phenotype with features that overlap with Noonan, Costello, and Cardiofaciocutaneous syndromes.
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