title: RNA sequencing reveals two major classes of gene expression levels in metazoan cells.
abstract: The expression level of a gene is often used as a proxy for determining whether the protein or RNA product is functional in a cell or tissue. Therefore, it is of fundamental importance to understand the global distribution of gene expression levels, and to be able to interpret it mechanistically and functionally. Here we use RNA sequencing (RNA-seq) of mouse Th2 cells, coupled with a range of other techniques, to show that all genes can be separated, based on their expression abundance, into two distinct groups: one group comprised of lowly expressed and putatively non-functional mRNAs, and the other of highly expressed mRNAs with active chromatin marks at their promoters. These observations are confirmed in many other microarray and RNA-seq data sets of metazoan cell types.
authors.affiliation: Structural Studies Division, MRC Laboratory of Molecular Biology, Cambridge, UK. danielh@mrc-lmb.cam.ac.uk
authors.forename: Daniel
authors.initials: D
authors.lastname: Hebenstreit
authors.forename: Miaoqing
authors.initials: M
authors.lastname: Fang
authors.forename: Muxin
authors.initials: M
authors.lastname: Gu
authors.forename: Varodom
authors.initials: V
authors.lastname: Charoensawan
authors.forename: Alexander
authors.initials: A
authors.lastname: van Oudenaarden
authors.forename: Sarah A
authors.initials: SA
authors.lastname: Teichmann
mesh_terms: D000818:Animals; D002478:Cells, Cultured; D019295:Computational Biology; D020869:Gene Expression Profiling / Q000379:methods*; D005786:Gene Expression Regulation; D017404:In Situ Hybridization, Fluorescence; D051379:Mice; D008810:Mice, Inbred C57BL; D046228:Microarray Analysis; D012333:RNA, Messenger / Q000235:genetics; D017423:Sequence Analysis, RNA / Q000379:methods*; D018418:Th2 Cells
chemical_list: D012333:RNA, Messenger