Department of Human Genetics, Nijmegen Centre for Molecular Life Sciences, Radboud University Nijmegen Medical Centre, Nijmegen, The Netherlands.
PLoS Genet. 2010 Aug 19;6(8):e1001065. doi: 10.1371/journal.pgen.1001065.
Heterozygous mutations in p63 are associated with split hand/foot malformations (SHFM), orofacial clefting, and ectodermal abnormalities. Elucidation of the p63 gene network that includes target genes and regulatory elements may reveal new genes for other malformation disorders. We performed genome-wide DNA-binding profiling by chromatin immunoprecipitation (ChIP), followed by deep sequencing (ChIP-seq) in primary human keratinocytes, and identified potential target genes and regulatory elements controlled by p63. We show that p63 binds to an enhancer element in the SHFM1 locus on chromosome 7q and that this element controls expression of DLX6 and possibly DLX5, both of which are important for limb development. A unique micro-deletion including this enhancer element, but not the DLX5/DLX6 genes, was identified in a patient with SHFM. Our study strongly indicates disruption of a non-coding cis-regulatory element located more than 250 kb from the DLX5/DLX6 genes as a novel disease mechanism in SHFM1. These data provide a proof-of-concept that the catalogue of p63 binding sites identified in this study may be of relevance to the studies of SHFM and other congenital malformations that resemble the p63-associated phenotypes.
杂合性 p63 基因突变与半肢畸形(SHFM)、口面裂和外胚层异常有关。阐明包括靶基因和调节元件的 p63 基因网络可能会揭示其他畸形疾病的新基因。我们在原代人角质形成细胞中进行了全基因组 DNA 结合谱分析,通过染色质免疫沉淀(ChIP),然后进行深度测序(ChIP-seq),并鉴定了由 p63 控制的潜在靶基因和调节元件。我们表明,p63 与染色体 7q 上 SHFM1 基因座上的一个增强子元件结合,该元件控制 DLX6 的表达,而这对于肢体发育很重要。在一位 SHFM 患者中,发现了一个独特的微缺失,其中包括这个增强子元件,但不包括 DLX5/DLX6 基因。我们的研究强烈表明,位于 DLX5/DLX6 基因 250kb 以上的非编码顺式调节元件的破坏是 SHFM1 中一种新的疾病机制。这些数据提供了一个概念验证,即本研究中鉴定的 p63 结合位点目录可能与 SHFM 和其他类似 p63 相关表型的先天性畸形的研究有关。
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