" /> Rubinstein-taybi syndrome 1 - CISMeF





Preferred Label : Rubinstein-taybi syndrome 1;

Symbol : RSTS1;

CISMeF acronym : RSTS; RSTS1;

Type : Phenotype, molecular basis known;

Alternative titles and symbols : Broad thumbs and great toes, characteristic facies, and mental retardation; RSTS; Rubinstein syndrome; Broad thumb-hallux syndrome;

Description : Rubinstein-Taybi syndrome is a multiple congenital anomaly syndrome characterized by mental retardation, postnatal growth deficiency, microcephaly, broad thumbs and halluces, and dysmorphic facial features. The facial appearance is striking, with highly arched eyebrows, long eyelashes, downslanting palpebral fissures, broad nasal bridge, beaked nose with the nasal septum, highly arched palate, mild micrognathia, and characteristic grimacing or abnormal smile. Affected individuals also have an increased risk of tumor formation (Rubinstein and Taybi, 1963; review by Hennekam, 2006). Floating-Harbor syndrome (136140), which shows phenotypic overlap with Rubinstein-Taybi syndrome, is caused by mutation in the SRCAP gene (611421), a coactivator for CREBBP. - Genetic Heterogeneity of Rubinstein-Taybi Syndrome Rubinstein-Taybi syndrome-1 (RSTS1) constitutes about 50 to 70% of patients with the disorder. Rubinstein-Taybi syndrome-2 (RSTS2; 613684) comprises about 3% of patients and is primarily due to de novo heterozygous mutation in the EP300 gene (602700) on chromosome 22q13 (Bartsch et al., 2010). See also chromosome 16p13.3 deletion syndrome (610543), a severe form of Rubinstein-Taybi syndrome resulting from a contiguous gene deletion involving the CREBBP gene as well as other neighboring genes.;

Inheritance : Autosomal dominant;

Molecular basis : Caused by mutation in the CREB-binding protein gene (CREBBP, 600140.0001);

Neoplasia : Increased risk of tumor formation, especially of the head; Increased risk of leukemia;

Laboratory abnormalities : A small minority of patients have translocations and inversions involving 16p13.3; Ten percent of cases are secondary to submicroscopic deletions of 16p13.3 detectable by FISH;

Prefixed ID : #180849;

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28/04/2025


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