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A Long Non‐Coding RNA (Lrap) Modulates Brain Gene Expression

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A Long Non‐Coding RNA (Lrap) Modulates Brain Gene Expression Received: 9 June 2020 Revised: 20 August 2020 Accepted: 1 September 2020 DOI: 10.1111/gbb.12698 ORIGINAL ARTICLE A long non-coding RNA (Lrap) modulates brain gene expression and levels of alcohol consumption in rats Laura M. Saba1 | Paula L. Hoffman1,2 | Gregg E. Homanics3 | Spencer Mahaffey1 | Swapna Vidhur Daulatabad4 | Sarath Chandra Janga4,5,6 | Boris Tabakoff1 1Department of Pharmaceutical Sciences, Skaggs School of Pharmacy & Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA 2Department of Pharmacology, School of Medicine, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA 3Departments of Anesthesiology, Neurobiology and Pharmacology & Chemical Biology, University of Pittsburgh, Pittsburgh, Pennsylvania, USA 4Department of BioHealth Informatics, Indiana University School of Informatics and Computing, Indiana University–Purdue University Indianapolis, Indianapolis, Indiana, USA 5Department of Medical and Molecular Genetics, Indiana University School of Medicine, Indianapolis, Indiana, USA 6Center for Computational Biology and Bioinformatics, Indiana University School of Medicine, Indianapolis, Indiana, USA Correspondence Boris Tabakoff, Department of Pharmaceutical Abstract Sciences, Skaggs School of Pharmacy & LncRNAs are important regulators of quantitative and qualitative features of the Pharmaceutical Sciences, University of Colorado Anschutz Medical Campus, 12850 transcriptome. We have used QTL and other statistical analyses to identify a gene E. Montview Blvd., Aurora, CO 80045. coexpression module associated with alcohol consumption. The “hub gene” of this Email: [email protected] module, Lrap (Long non-coding RNA for alcohol preference), was an unannotated Funding information transcript resembling a lncRNA. We used partial correlation analyses to establish that Banbury Fund; Ethanol Mechanisms in GABAAR gene targeted mice, Grant/Award Lrap is a major contributor to the integrity of the coexpression module. Using Number: R37AA010422; Mapping RNA CRISPR/Cas9 technology, we disrupted an exon of Lrap in Wistar rats. Measures of Protein Interaction Networks in the Human Genome, Grant/Award Number: alcohol consumption in wild type, heterozygous and knockout rats showed that dis- R01GM123314; Overall NIDA Core "Center of ruption of Lrap produced increases in alcohol consumption/alcohol preference. The Excellence" in Transcriptomics, Systems Genetics and the Addictome, Grant/Award disruption of Lrap also produced changes in expression of over 700 other transcripts. Number: P30DA044223; Role of noncoding Furthermore, it became apparent that Lrap may have a function in alternative splicing RNA in Alcohol Action, Grant/Award Number: U01AA020889; The Heritable Transcriptome of the affected transcripts. The GO category of “Response to Ethanol” emerged as and Alcoholism, Grant/Award Number: one of the top candidates in an enrichment analysis of the differentially expressed R24AA013162 transcripts. We validate the role of Lrap as a mediator of alcohol consumption by rats, and also implicate Lrap as a modifier of the expression and splicing of a large number of brain transcripts. A defined subset of these transcripts significantly impacts alcohol Abbreviations: A3SS, alternative 30 splice site; A5SS, alternative 50 splice site; API, application programming interface; AS, alternative splicing; BN, Brown Norway; CNS, central nervous system; Ct, cycle threshold; DE, differentially expressed; FDR, false discovery rate; GO, gene ontology; HISAT2, hierarchical indexing for spliced alignment of transcripts 2; KEGG, Kyoto Encyclopedia of Genes and Genomes; lncRNA, long non-coding RNA; LOD, logarithm of the odds; Lrap, long non-coding RNA for alcohol preference; MXE, mutually exclusive exons; ORF, open reading frame; PCR, polymerase chain reaction; qRT-PCR, quantitative real-time polymerase chain reaction; QTL, quantitative trait loci; ReI, retained intron; RI, recombinant inbred; rMATS, replicate multivariate analysis of transcript splicing; RNASeq, RNA sequencing; RSEM, RNA-seq by expectation–maximization; SE, skipped exon; sgRNA, single guide RNA; SHR, spontaneously hypertensive rat; SNP, single nucleotide polymorphism; SOI, sum of isoforms; WGCNA, weighted gene co-expression network analysis. [Correction added on 22 October 2020, after first online publication: The article category has been updated from “Review” to “Original Article” in this current version.] This is an open access article under the terms of the Creative Commons Attribution-NonCommercial-NoDerivs License, which permits use and distribution in any medium, provided the original work is properly cited, the use is non-commercial and no modifications or adaptations are made. © 2020 The Authors. Genes, Brain and Behavior published by International Behavioural and Neural Genetics Society and John Wiley & Sons Ltd. Genes, Brain and Behavior. 2021;20:e12698. wileyonlinelibrary.com/journal/gbb 1of19 https://doi.org/10.1111/gbb.12698 2of19 SABA ET AL. consumption by rats (and possibly humans). Our work shows the pleiotropic nature of non-coding elements of the genome, the power of network analysis in identifying the critical elements influencing phenotypes, and the fact that not all changes pro- duced by genetic editing are critical for the concomitant changes in phenotype. KEYWORDS brain RNA expression networks, long non-coding RNA, predisposing factors, genetic modification, CRISPR/Cas, quantitative genetics, recombinant inbred rat strains, systems genetics, transcriptome, voluntary alcohol consumption 1 | INTRODUCTION transcript that is a member of the module for which Lrap is the “hub gene”, and also produces broad changes in expression and splicing of Long non-coding RNA (lncRNA) is a class of transcribed elements that other transcripts in brain. In all, we show that the constitutive disrup- is present in living cells from an organism's conception to death.1,2 tion of the Lrap gene sequence produces a broad spectrum of changes These >200 bp transcripts have been shown to influence transcrip- in brain gene expression, and that subsets of the Lrap-affected tran- tion, translation and splicing events,3-5 and to play a critical role in the scriptional events can significantly alter alcohol consumption. development and senescence of an organism.6,7 During adulthood, the mammalian brain has the largest assortment of lncRNAs, com- pared with other organs, and several have been shown to participate 2 | MATERIALS AND METHODS in neuronal and glial function.8,9 Alcohol (ethanol) consumption is evident in phyla from insects (Dro- All procedures involving animals were approved by the Institutional sophila)10 to mammals (including Homo sapiens). Alcohol is consumed for Animal Care and Use Committee of the University of Pittsburgh or a number of reasons, including being a source of calories, for gustatory the Institutional Animal Care and Use Committee of the University of reward, and for its psychoactive properties.11,12 The consumption of Colorado Anschutz Medical Campus and were performed in accor- alcohol is also a sine qua non for development of alcohol addiction dance with the guidelines in the NIH Guide for the Care and Use of (Alcohol Use Disorder), and both alcohol consumption and Alcohol Use Laboratory Animals. Disorder have been shown to have a major genetic component.13 In exploring the genetic and neural determinants of levels of alcohol consumption by animals, we previously applied a series of systems genet- 2.1 | Identification of transcripts responsible for ics analyses to microarray data that included measures of brain RNA network cohesiveness expression levels across a panel of recombinant inbred (RI) and selectively bred rats that differed significantly in their levels of voluntary alcohol con- To prioritize which transcript should be disrupted within the sumption.14 Our results identified a gene co-expression module, consisting previously-identified candidate module for alcohol consumption,14 we of 17 gene products, that was implicated in influencing the levels of alco- assessed the individual association (correlation) of each transcript with hol consumption. The “hub gene” ofthemodule(themostconnectedtran- alcohol consumption, and the association of the expression levels of script within the module) was identified as an unannotated transcript that each transcript with the alcohol consumption QTL on rat chromosome showed all of the characteristics of an lncRNA, and we refer to this tran- 12.14 We also evaluated each transcript's connectivity within the script as Lrap (Long non-coding RNA for alcohol preference). module, and the changes in network cohesion when we “mimicked” a We now extend our work by determining, through statistical anal- scenario where the expression level of one of the transcripts does not ysis, whether the expression of one of the genes in the module influ- vary among samples (partial correlation analysis). ences the association between other genes in the module.15 Based on the results of this analysis we find that the “hub gene” of the module, Lrap, is critical for cohesion of the co-expression module. We gener- 2.1.1 | Use of data from previously published work ate further information on the sequence of Lrap and illustrate its pres- for further analysis ence in mouse and human as well as rat. We then produce rats that are genetically modified by deletion of Gene expression analysis a portion of the Lrap gene using CRISPR/Cas9 techniques. Using Expressed transcripts
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