PMID: 11331617May 2, 2001Paper

Defect of histone acetyltransferase activity of the nuclear transcriptional coactivator CBP in Rubinstein-Taybi syndrome

Human Molecular Genetics
T MurataY Hayashi

Abstract

CREB-binding protein (CBP) is a transcriptional coactivator that has intrinsic histone acetyltransferase (HAT) activity. CBP is the causative gene of Rubinstein-Taybi syndrome (RTS). To investigate the relationships between CBP HAT activity and RTS, we analyzed 16 RTS patients. A microdeletion was identified in one patient by fluorescent in situ hybridization analysis. Heteroallelic mutations were identified in five patients by reverse transcriptase-polymerase chain reaction-single-strand conformation polymorphism analysis and sequencing. These included a 2 bp deletion between nucleotides 4319 and 4320, an 11 bp deletion between nucleotides 4898 and 4908, a 14 bp insertion (CCTCGGTCCTGCAC) between nucleotides 5212 and 5213, a 2 bp deletion between nucleotides 5222 and 5223, and a missense mutation from guanine (G) to cytosine (C) at nucleotide 4951 that changed codon 1378 from CGG (arginine) to CCG (proline). The identical missense mutation was introduced into the recombinant mouse CBP. It abolished the HAT activity of CBP and the ability of CBP to transactivate cyclic AMP-response element binding protein (CREB), in HAT assays and in microinjection experiments, respectively. These results suggest that the loss of the HAT activi...Continue Reading

Citations

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