Rubinstein-Taybi syndrome

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Polydactyly - an infant's hand

Rubinstein-Taybi syndrome

Definition:

Rubinstein-Taybi syndrome is a genetic disease characterized by mental deficiency, broad thumbs and toes, short stature, and characteristic facial features.

Alternative Names:
Rubinstein syndrome
Causes, incidence, and risk factors:

Rubinstein-Taybi syndrome (RTS) is a rare condition, affecting about 1 in 125,000 people. The gene involved in RTS, which is called CREB binding protein (CREBBP), was identified in 1995.

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Most patients have mutations in the gene, resulting in an abnormal CREB binding protein. About 10% of patients, typcially with more severe problems, have an outright deletion of the gene and they do not make any of the protein.

Most cases are sporadic and likely due to a new mutation occurring during fetal development, which was not passed on by either parent. However, in some cases, it is inherited in an autosomal dominant fashion, which means that if one parent passes on the defective gene, the child will be affected.

The classic feature is broad thumbs and great toes, but typically there is also short stature, unusual face, low-set ears, port-wine-stain, undescended testicles in the male, and downward slant of the eyes.