Unknown,Transcriptomics,Genomics,Proteomics

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ChIP-seq analysis identifies p27(Kip1)-target genes involved in cell adhesion and cell signalling in mouse embryonic fibroblasts

ABSTRACT: The protein p27(Kip1), a member of the Cip-Kip family of cyclin-dependent kinase inhibitors, has been recently identified as a transcriptional regulator. However, the transcriptional programs regulated by this protein, still remain mostly unknown. The aim of this study has been to define the transcriptional programs regulated by p27 by first identifying the p27-binding sites on the whole chromatin of quiescent mouse embryonic fibroblasts by Chromatin Immunoprecipitation Sequencing (ChIP-seq). Results revealed that most of the p27 binding sites were in distal intergenic regions and introns whereas, in contrast, its association with promoter regions was very low. Gene ontology analysis of the protein coding genes revealed a number of relevant transcriptional programs regulated by p27 as cell adhesion, intracellular signalling and neuron differentiation among others. We validated the interaction of p27 with different chromatin regions by ChIP followed by qPCR and demonstrated that the expressions of several genes belonging to these programs are actually regulated by p27.

INSTRUMENT(S): Illumina HiSeq 2000

ORGANISM(S): Mus musculus

SUBMITTER: Oriol Bachs

PROVIDER: E-MTAB-5105 | biostudies-arrayexpress |

REPOSITORIES: biostudies-arrayexpress

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Project description:Our goal is to find new genes regulated by p21 in human primary cells . To get it we carried out a gene expression profiling in two different models, human myeloid leukemia K562 cells and human keratinocytes both of them with conditional expression of p21. In order to identify genes specifically modulated by p21 we compared with the cell line with overexpression of p27, because p21 and p27 belong to the same gene family and regulated the same genes specially in cell cycle. So, our intention is to identify only genes regulated by p21 and not p27. In order to confirm these results we studied the p21-dependent repression of mitotic genes in a different cellular system. We chose human primary keratinocytes because they are non-tumorigenic, non-immortalized and epithelial cells, in contrast to human myeloid leukemia K562 cells. Human primary keratinocytes were infected with recombinant adenoviruses expressing the full-length p21 protein. A dramatic increase in p21 in infected keratinocytes was demonstrated by RT-qPCR (as we show in the manuscript). As controls, we also infected the keratinocytes with adenovirus carrying the genes for p27 which overexpression was also confirmed by RT-qPCR (as we show in the manuscript). We prepared RNA 24 h after infection and performed large-scale expression assay using the Afftymetrix platform. The clustering analysis revealed that p21 provoked the down-regulation of a number genes involved in cell cycle control not shared by cells expressing p27 (as we show in the manuscript). Our goal, has been getting genes regulated more strongly by p21 and not by p27 in cell cycle and mitosis. Our result are supported because we have found the same genes in two different models and also we have validated (by RT-qPCR) more than 20 cell cycle and mitotic genes, found in our affymetrix arrays. Also we have found the region of p21 that is sufficient for gene regulation and for one gene we have described as p21 bind to the promoter. Finally, we have discussed in our manuscript how p21 can do this regulation by bioinformatic analysis of p21-target genes. The success of this study is to describe a new role of p21 as a transcriptional co-repressor in some systems.

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ChIP-seq analysis identifies p27(Kip1)-target genes involved in cell adhesion and cell signalling in mouse embryonic fibroblasts

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