Abstract
Modification of RNA is essential for properly expressing the repertoire of RNA transcripts necessary for both cell type and developmental specific functions. RNA modifications serve to dynamically re-wire and fine-tune the genetic information carried by an invariable genome. One important type of RNA modification is RNA editing and the most common and well-studied type of RNA editing is the hydrolytic deamination of adenosine to inosine. Inosine is a biological mimic of guanosine; therefore, when RNA is reverse transcribed, inosine is recognized as guanosine by the reverse transcriptase and a cytidine is incorporated into the complementary DNA (cDNA) strand. During PCR amplification, guanosines pair with the newly incorporated cytidines. As a result, the adenosine-to-inosine (A-to-I) editing events are recognized as adenosine to guanosine changes when comparing the sequences of the genomic DNA to the cDNA. This chapter describes the methods for extracting endogenous RNA for subsequent analyses of A-to-I RNA editing using reverse transcriptase-based approaches. We discuss techniques for the detection of A-to-I RNA editing events in messenger RNA (mRNA), including analyzing editing levels at specific adenosines within the total pool of mRNA versus analyzing editing patterns that occur in individual transcripts and a method for detecting editing events across the entire transcriptome. The detection of RNA editing events and editing levels can be used to better understand normal biological processes and disease states.
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References
Gott JM, Emeson RB (2000) Functions and mechanisms of RNA editing. Annu Rev Genet 34:499–531. doi:10.1146/annurev.genet.34.1.499
Licht K, Jantsch MF (2016) Rapid and dynamic transcriptome regulation by RNA editing and RNA modifications. J Cell Biol 213(1):15–22. doi:10.1083/jcb.201511041
Mannion N, Arieti F, Gallo A, Keegan LP, O'Connell MA (2015) New insights into the biological role of mammalian ADARs; the RNA editing proteins. Biomol Ther 5(4):2338–2362. doi:10.3390/biom5042338
Savva YA, Rieder LE, Reenan RA (2012) The ADAR protein family. Genome Biol 13(12):252. doi:10.1186/gb-2012-13-12-252
Samuel CE (2012) ADARs: viruses and innate immunity. Curr Top Microbiol Immunol 353:163–195. doi:10.1007/82_2011_148
Gommans WM (2012) A-to-I editing of microRNAs: regulating the regulators? Semin Cell Dev Biol 23(3):251–257. doi:10.1016/j.semcdb.2011.09.018
Daniel C, Lagergren J, Ohman M (2015) RNA editing of non-coding RNA and its role in gene regulation. Biochimie 117:22–27. doi:10.1016/j.biochi.2015.05.020
Nishikura K (2016) A-to-I editing of coding and non-coding RNAs by ADARs. Nat Rev Mol Cell Biol 17(2):83–96. doi:10.1038/nrm.2015.4
Li JB, Levanon EY, Yoon JK, Aach J, Xie B, Leproust E, Zhang K, Gao Y, Church GM (2009) Genome-wide identification of human RNA editing sites by parallel DNA capturing and sequencing. Science 324(5931):1210–1213. doi:10.1126/science.1170995
Peng Z, Cheng Y, Tan BC, Kang L, Tian Z, Zhu Y, Zhang W, Liang Y, Hu X, Tan X, Guo J, Dong Z, Liang Y, Bao L, Wang J (2012) Comprehensive analysis of RNA-Seq data reveals extensive RNA editing in a human transcriptome. Nat Biotechnol 30(3):253–260. doi:10.1038/nbt.2122
Porath HT, Carmi S, Levanon EY (2014) A genome-wide map of hyper-edited RNA reveals numerous new sites. Nat Commun 5:4726. doi:10.1038/ncomms5726
Ramaswami G, Lin W, Piskol R, Tan MH, Davis C, Li JB (2012) Accurate identification of human Alu and non-Alu RNA editing sites. Nat Methods 9(6):579–581. doi:10.1038/nmeth.1982
Ramaswami G, Zhang R, Piskol R, Keegan LP, Deng P, O'Connell MA, Li JB (2013) Identifying RNA editing sites using RNA sequencing data alone. Nat Methods 10(2):128–132. doi:10.1038/nmeth.2330
Slotkin W, Nishikura K (2013) Adenosine-to-inosine RNA editing and human disease. Genome Med 5(11):105. doi:10.1186/gm508
Tariq A, Jantsch MF (2012) Transcript diversification in the nervous system: a to I RNA editing in CNS function and disease development. Front Neurosci 6:99. doi:10.3389/fnins.2012.00099
Enstero M, Daniel C, Wahlstedt H, Major F, Ohman M (2009) Recognition and coupling of A-to-I edited sites are determined by the tertiary structure of the RNA. Nucleic Acids Res 37(20):6916–6926. doi:10.1093/nar/gkp731
Wheeler EC, Washburn MC, Major F, Rusch DB, Hundley HA (2015) Noncoding regions of C. elegans mRNA undergo selective adenosine to inosine deamination and contain a small number of editing sites per transcript. RNA Biol 12(2):162–174. doi:10.1080/15476286.2015.1017220
Veno MT, Bramsen JB, Bendixen C, Panitz F, Holm IE, Ohman M, Kjems J (2012) Spatio-temporal regulation of ADAR editing during development in porcine neural tissues. RNA Biol 9(8):1054–1065. doi:10.4161/rna.21082
Bass B, Hundley H, Li JB, Peng Z, Pickrell J, Xiao XG, Yang L (2012) The difficult calls in RNA editing. Interviewed by H Craig Mak. Nat Biotechnol 30(12):1207–1209. doi:10.1038/nbt.2452
Zuker M (2003) Mfold web server for nucleic acid folding and hybridization prediction. Nucleic Acids Res 31(13):3406–3415
Bazak L, Haviv A, Barak M, Jacob-Hirsch J, Deng P, Zhang R, Isaacs FJ, Rechavi G, Li JB, Eisenberg E, Levanon EY (2014) A-to-I RNA editing occurs at over a hundred million genomic sites, located in a majority of human genes. Genome Res 24(3):365–376. doi:10.1101/gr.164749.113
Alon S, Garrett SC, Levanon EY, Olson S, Graveley BR, Rosenthal JJ, Eisenberg E (2015) The majority of transcripts in the squid nervous system are extensively recoded by A-to-I RNA editing. eLife 4. doi:10.7554/eLife.05198
Fumagalli D, Gacquer D, Rothe F, Lefort A, Libert F, Brown D, Kheddoumi N, Shlien A, Konopka T, Salgado R, Larsimont D, Polyak K, Willard-Gallo K, Desmedt C, Piccart M, Abramowicz M, Campbell PJ, Sotiriou C, Detours V (2015) Principles governing A-to-I RNA editing in the breast cancer transcriptome. Cell Rep 13(2):277–289. doi:10.1016/j.celrep.2015.09.032
Paz-Yaacov N, Bazak L, Buchumenski I, Porath HT, Danan-Gotthold M, Knisbacher BA, Eisenberg E, Levanon EY (2015) Elevated RNA editing activity is a major contributor to transcriptomic diversity in tumors. Cell Rep 13(2):267–276. doi:10.1016/j.celrep.2015.08.080
Han L, Diao L, Yu S, Xu X, Li J, Zhang R, Yang Y, Werner HM, Eterovic AK, Yuan Y, Li J, Nair N, Minelli R, Tsang YH, Cheung LW, Jeong KJ, Roszik J, Ju Z, Woodman SE, Lu Y, Scott KL, Li JB, Mills GB, Liang H (2015) The genomic landscape and clinical relevance of A-to-I RNA editing in human cancers. Cancer Cell 28(4):515–528. doi:10.1016/j.ccell.2015.08.013
Qiu S, Li W, Xiong H, Liu D, Bai Y, Wu K, Zhang X, Yang H, Ma K, Hou Y, Li B (2016) Single-cell RNA sequencing reveals dynamic changes in A-to-I RNA editome during early human embryogenesis. BMC Genomics 17(1):766. doi:10.1186/s12864-016-3115-2
Washburn MC, Kakaradov B, Sundararaman B, Wheeler E, Hoon S, Yeo GW, Hundley HA (2014) The dsRBP and inactive editor ADR-1 utilizes dsRNA binding to regulate A-to-I RNA editing across the C. elegans transcriptome. Cell Rep 6(4):599–607. doi:10.1016/j.celrep.2014.01.011
Acknowledgment
Work in the Hundley lab is supported by Research Scholar Award RSG-15-051-01-RMC from the American Cancer Society. We thank Aidan Manning and Dr. Sarah Deffit for helpful comments on the manuscript.
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Oakes, E., Vadlamani, P., Hundley, H.A. (2017). Methods for the Detection of Adenosine-to-Inosine Editing Events in Cellular RNA. In: Shi, Y. (eds) mRNA Processing. Methods in Molecular Biology, vol 1648. Humana Press, New York, NY. https://doi.org/10.1007/978-1-4939-7204-3_9
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DOI: https://doi.org/10.1007/978-1-4939-7204-3_9
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