Rubinstein-Taybi syndrome in a Saudi boy with distinct features and variants in both the CREBBP and EP300 genes: a case report, BMC Medical Genetics

Background Rubinstein-Taybi syndrome (RSTS) Type 1 (OMIM 180849) is characterized by three main features: intellectual disability; broad and frequently angulated thumbs and halluces; and characteristic facial dysmorphism. Case presentation We report on a Saudi boy with RSTS Type 1 and the following distinct features: a midline notch of the upper lip, a bifid tip of the tongue, a midline groove of the lower lip, plump fingers with broad / flat fingertips, and brachydactyly. The child was found to be heterozygous in the CREBBP gene for a sequence variant designated c.4963del, which is predicted to result in premature protein termination p.Leu1655Cysfs*89. The child and his father were also found to be heterozygous in the EP300 gene for a sequence variant designated c.586A > G, which is predicted to result in the amino-acid substitution p.Ile196Val. Conclusion Our report expands the clinical spectrum of RSTS to include several distinct facial and limb features. The variant of the CREBBP gene is known to be causative of RSTS Type 1. The variant in the EP300 gene is benign since the father carried the same variant and exhibited no abnormalities. However, functional studies are required to investigate if this benign EP300 variant influences the phenotype in the presence of disease-causing CREBBP gene mutations.

Rubinstein-Taybi syndrome: MedlinePlus Genetics

Fetal phenotype of Rubinstein‐Taybi syndrome caused by CREBBP mutations - Van‐Gils - 2019 - Clinical Genetics - Wiley Online Library

Genes, Free Full-Text

CREBBP mutations in individuals without Rubinstein–Taybi syndrome phenotype - Menke - 2016 - American Journal of Medical Genetics Part A - Wiley Online Library

PDF) Molecular studies in 10 cases of Rubinstein-Taybi syndrome, including a mild variant showing a missense mutation in codon 1175 of CREBBP [3]

First case report of inherited Rubinstein-Taybi syndrome associated with a novel EP300 variant, BMC Medical Genetics

PDF) Lacrimal drainage anomalies in Rubinstein-Taybi syndrome: case report and review of literature

Rubinstein–Taybi syndrome: clinical and molecular overview, Expert Reviews in Molecular Medicine

PDF) Facial dysmorphism, skeletal anomalies, congenital glucoma, dysplastic nails: Mild Rubinstein-Taybi Syndrome

The emerging role of chromatin remodelers in neurodevelopmental disorders: a developmental perspective

PDF) Rubinstein-Taybi syndrome medical guidelines

Patient 1 showing a mild RTS variant (incomplete RTS). (A, B) Note