Abnormal skeletal patterning in embryos lacking a single Cbp allele: a partial similarity with Rubinstein-Taybi syndrome.
CBP is a transcriptional coactivator required by many transcription factors for transactivation. Rubinstein-Taybi syndrome, which is an autosomal dominant syndrome characterized by abnormal pattern formation, has been shown to be associated with mutations in the Cbp gene. Furthermore, Drosophila CBP is required in hedgehog signaling for the expression of decapentapleigic, the Drosophila homologue of bone morphogenetic protein. However, no direct evidence exists to indicate that loss of one copy of the mammalian Cbp gene affects pattern formation. Here, we show that various abnormalities occur at high frequency in the skeletal system of heterozygous Cbp-deficient mice resulting from a C57BL/6-CBA x BALB/c cross. In support of a conserved signaling pathway for pattern formation in insects and mammals, the expression of Bmp7 was found to be reduced in the heterozygous mutants. The frequency of the different abnormalities was significantly lower in a C57BL/6-CBA background, suggesting that the genetic background is an important determinant of the variability and severity of the anomalies seen in Rubinstein-Taybi syndrome patients.
Tanaka
Y
Y
Laboratory of Molecular Genetics, Tsukuba Life Science Center, RIKEN, Tsukuba, Ibaraki 305, Japan.
Naruse
I
I
Maekawa
T
T
Masuya
H
H
Shiroishi
T
T
Ishii
S
S
D000818:Animals; D019521:Body Patterning; D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins / Q000235:genetics; D001842:Bone and Bones / Q000196:embryology* / Q000473:pathology; D002352:Carrier Proteins / Q000235:genetics*; D002478:Cells, Cultured; D005260:Female; D006579:Heterozygote; D008297:Male; D051379:Mice; D008817:Mice, Mutant Strains; D009154:Mutation; D010641:Phenotype; D013577:Syndrome; D016212:Transforming Growth Factor beta
D055419:Bone Morphogenetic Protein 7; D019485:Bone Morphogenetic Proteins; D002352:Carrier Proteins; D016212:Transforming Growth Factor beta; C020723:citrate-binding transport protein