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Oike, Y. et al.

Truncated CBP protein leads to classical Rubinstein-Taybi syndrome phenotypes in mice: implications for a dominant-negative mechanism.

A mouse model of Rubinstein-Taybi syndrome (RTS) was generated by an insertional mutation into the cyclic AMP response element-binding protein (CREB)-binding protein (CBP) gene. Heterozygous CBP-deficient mice, which had truncated CBP protein (residues 1-1084) containing the CREB-binding domain (residues 462-661), showed clinical features of RTS, such as growth retardation (100%), retarded osseous maturation (100%), hypoplastic maxilla with narrow palate (100%), cardiac anomalies (15%) and skeletal abnormalities (7%). Truncated CBP is considered to have been acting during development as a dominant-negative inhibitor to lead to the phenotypes of RTS in mice. Our studies with step-through-type passive avoidance tests and with fear conditioning test showed that mice were deficient in long-term memory (LTM). In contrast, short-term memory (STM) appeared to be normal. These results implicate a crucial role for CBP in mammalian LTM. Our CBP +/- mice would be an excellent model for the study of the role of CBP in development and memory storage mechanisms.[1]

References

Truncated CBP protein leads to classical Rubinstein-Taybi syndrome phenotypes in mice: implications for a dominant-negative mechanism. Oike, Y., Hata, A., Mamiya, T., Kaname, T., Noda, Y., Suzuki, M., Yasue, H., Nabeshima, T., Araki, K., Yamamura, K. Hum. Mol. Genet. (1999) [Pubmed]

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