Genome-wide maps of chromatin state in liver cells.

We report the application of single-molecule-based sequencing technology for high-throughput profiling of histone modifications in mammalian cells. By obtaining over four billion bases of sequence from chromatin immunoprecipitated DNA, we generated genome-wide chromatin-state maps of mouse liver cells. We find that lysine 4 trimethylation effectively discriminates genes that are expressed, poised for expression, or stably repressed, and therefore reflect cell state and lineage potential. Lysine 9 and 27 trimethylation marks primary coding and non-coding transcripts, have no differents in gene annotation. Trimethylation of lysine 4 is detected has different expresssion at mir124 site front of lnc-RNA(10835)Far. Finally, we show that chromatin state can be read in an allele-specific manner by using single nucleotide polymorphisms. This study provides a framework for the application of comprehensive chromatin profiling towards characterization of diverse mammalian cell populations. Examination of 3 different histone modifications in C57 and ficolinA ko mouse liver cells .