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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >The cleft lip and palate defects in Dancer mutant mice result from gain of function of the Tbx10 gene.
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The cleft lip and palate defects in Dancer mutant mice result from gain of function of the Tbx10 gene.

机译:Dancer突变小鼠的唇裂和pa裂缺陷是由Tbx10基因功能的获得引起的。

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摘要

Cleft lip and palate (CL/P) is a common disfiguring birth defect with complex, poorly understood etiology. Mice carrying a spontaneous mutation, Dancer (Dc), exhibit CL/P in homozygotes and show significantly increased susceptibility to CL/P in heterozygotes [Deol, M. S. & Lane, P. W. (1966) J. Embryol. Exp. Morphol. 16, 543-558 and Trasler, D. G., Kemp, D. & Trasler, T. A. (1984) Teratology 29, 101-104], providing an animal model for understanding the molecular pathogenesis of CL/P. We genetically mapped Dc to within a 1-cM region near the centromere of chromosome 19. In situ hybridization analysis showed that one positional candidate gene, Tbx10, is ectopically expressed in Dc mutant embryos. Positional cloning of the Dc locus revealed an insertion of a 3.3-kb sequence containing the 5' region of the p23 gene into the first intron of Tbx10, which causes ectopic expression of a p23-Tbx10 chimeric transcript encoding a protein product identical to a normal variant of the Tbx10 protein. Furthermore, we show that ectopic expression of Tbx10 in transgenic mice recapitulates the Dc mutant phenotype, indicating that CL/Pin Dc mutant mice results from the p23 insertion-induced ectopic Tbx10 expression. These results identify gain of function of a T-box transcription factor gene as a mechanism underlying CL/P pathogenesis.
机译:唇pa裂(CL / P)是一种常见的毁容性出生缺陷,病因复杂,缺乏了解。携带自发突变的小鼠Dancer(Dc)在纯合子中表现出CL / P,在杂合子中表现出对CL / P的显着增加[Deol,M.S.&Lane,P.W.(1966)J.Embryol。经验Morphol。 16,543-558和Trasler,D.G.,Kemp,D。和Trasler,T.A。(1984)Teratology 29,101-104],提供了用于理解CL / P的分子发病机理的动物模型。我们将Dc遗传定位到19号染色体着丝粒附近的1-cM区域内。原位杂交分析表明,一个位置候选基因Tbx10在Dc突变体胚胎中异位表达。 Dc基因座的位置克隆揭示了一个包含p23基因5'区域的3.3 kb序列插入到Tbx10的第一个内含子中,这导致异位表达p23-Tbx10嵌合转录本,该转录本编码的蛋白质产物与正常Tbx10蛋白的变体。此外,我们显示转基因小鼠中Tbx10的异位表达概括了Dc突变体表型,表明CL / Pin Dc突变体小鼠是由p23插入诱导的异位Tbx10表达引起的。这些结果表明,T-box转录因子基因功能的获得是CL / P发病机理的基础。

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