Next-generation sequencing Facilitates Quantitative Analysis of Wild Type and EED-/- mice cerebellum Transcriptomes and Genome-wide maps of chromatin state in Wild Type and EED-/- mice cerebellum

Purpose: The goals of this study are to compare Wild Type and EED-/- cerebellum transcriptome profiling (RNA-seq) to quantitative reverse transcription polymerase chain reaction (qRT–PCR) differentially expressed genes and find target genes. We performed chromatin-immunoprecipitation coupled to sequencing (ChIP-seq) to dissect the relationship between the differentially expressed genes and the occupancy of H3K27me3, H3K27ac and EED. Methods: Cerebellum mRNA profiles of 14-day-old(P14) wild-type (WT) and Embryonic Ectoderm Development conditional knockout (EED-/-) mice were generated by deep sequencing, in triplicate,using Illumina HiSeq 2500 system.All RNA-Seq data were aligned to mouse genome version mm10 using Salmon (v.1.1.0) .We use cluster software and Euclidean distance matrix for the hierarchical clustering analysis of the expressed gene and sample program at the same time, the clustering results can be viewed with javaTreeview. qRT–PCR validation was performed using SYBR Green assays. we performed ChIP-seq using freshly isolated P14 from Wild Type and EED-/- cerebellar tissues . DNA libraries generated from ChIP-DNA and input-DNA were deep-sequenced using HiSeq single-end 50bp. Results:Only transcripts that showed more than 1.5-fold differential expression compared to control were subjected to relevance network analysis. 3149 candidate genes that were differentially expressed with biological functional groups as compared between WT and EED-/- mice .We found that the enrichment of H3K27me3 was decreased H3K27ac was highly increased in EED-/- mice. Conclusions: Our study represents the first detailed analysis of Wild Type and EED-/ mice cerebellum transcriptomes, with three biologic replicates, generated by RNA-seq technology. We report the application of ChIP-sequencing technology for high-throughput profiling of histone modifications in cerebellar cells.