Abstract
Several approaches for miRNA expression analysis have been developed in recent years. In this article, we provide an updated and comprehensive review of available qPCR-based methods for miRNA expression analysis and discuss their advantages and disadvantages. Existing techniques involve the use of stem–loop reverse transcriptase–PCR, polyadenylation of RNAs, ligation of adapters or RT with complex primers, using universal or miRNA-specific qPCR primers and/or probes. Many of these methods are oriented towards the expression analysis of mature miRNAs and few are designed for the study of pre-miRNAs and pri-miRNAs. We also discuss findings from articles that compare results from existing methods. Finally, we suggest key points for the improvement of available techniques and for the future development of additional methods.
References
- 1. . Regulatory mechanisms of microRNA expression. J. Translat. Med. 14(1), 143 (2016).
- 2. Interplay between miRNAs and human diseases. J. Cell. Physiol. 233(3), 2007–2018 (2018).
- 3. Comparison of miRNA evolution and function in plants and animals. MicroRNA 7(1), 4–10 (2018).
- 4. . Plant microRNAs: biogenesis, homeostasis, and degradation. Front. Plant Sci. 10, 360 (2019).
- 5. . miRBase: from microRNA sequences to function. Nucl. Acids Res. 47(D1), D155–D162 (2018).
- 6. . Strategies for profiling microRNA expression. J. Cell. Physiol. 218(1), 22–25 (2009).
- 7. . MicroRNA profiling: approaches and considerations. Nat. Rev. Genet. 13(5), 358–369 (2012).
- 8. . Profiling microRNAs by real-time PCR. Method. Mol. Biol. 732, 39–54 (2011).
- 9. . Comparison of PubMed, Scopus, Web of Science, and Google Scholar: strengths and weaknesses. FASEB J. 22(2), 338–342 (2008).
- 10. . A high-throughput method to monitor the expression of microRNA precursors. Nucl. Acids Res. 32(4), e43 (2004).
- 11. Real-time quantification of microRNAs by stem-loop RT-PCR. Nucl. Acids Res. 33(20), e179 (2005).
- 12. . Facile means for quantifying microRNA expression by real-time PCR. BioTechniques 39(4), 519–525 (2005).
- 13. Quantification of mature microRNAs using pincer probes and real-time PCR amplification. PLoS One 10(3), e0120160 (2015).
- 14. Linear-hairpin variable primer RT-qPCR for microRNA. Chem. Sci. 10(7), 2034–2043 (2019).
- 15. Real-time PCR based on SYBR-Green I fluorescence: an alternative to the TaqMan assay for a relative quantification of gene rearrangements, gene amplifications and micro gene deletions. BMC Biotechnol. 3, 18 (2003).
- 16. Quantification of distinct let-7 microRNA family members by a modified stem-loop RT-qPCR. Mol. Med. Report. 17(3), 3690–3696 (2018).
- 17. . Multiplexing RT-PCR for the detection of multiple miRNA species in small samples. Biochem. Biophys. Res. Comm. 343(1), 85–89 (2006).
- 18. . A universal TaqMan-based RT-PCR protocol for cost-efficient detection of small noncoding RNA. RNA 19(12), 1864–1873 (2013).
- 19. . Improved RT-PCR assay to quantitate the pri-, pre-, and mature microRNAs with higher efficiency and accuracy. Mol. Biotechnol. 57(10), 939–946 (2015).
- 20. . A PCR-based method for detection and quantification of small RNAs. Biochem. Biophys. Res. Comm. 351(3), 756–763 (2006).
- 21. . Specific and sensitive quantitative RT-PCR of miRNAs with DNA primers. BMC Biotechnol. 11, 70 (2011).
- 22. A novel real-time PCR assay of microRNAs using S-Poly(T), a specific oligo(dT) reverse transcription primer with excellent sensitivity and specificity. PLoS One 7(11), e48536 (2012).
- 23. Identification of cytokine-induced modulation of microRNA expression and secretion as measured by a novel microRNA specific qPCR assay. Sci. Rep. 5, 11590 (2015).
- 24. . miR-ID: a novel, circularization-based platform for detection of microRNAs. RNA 17(2), 365–380 (2011).
- 25. A universal linker-RT PCR based quantitative method for the detection of circulating miRNAs. Analyt. Method. 6(22), 9101–9107 (2014).
- 26. . Dumbbell-PCR: a method to quantify specific small RNA variants with a single nucleotide resolution at terminal sequences. Nucl. Acids Res. 43(12), e77 (2015).
- 27. Development and application of a novel reverse transcription real-time PCR method for miR-499 quantification. Clin. Biochem. 46(15), 1566–1571 (2013).
- 28. . A convenient system for highly specific and sensitive detection of miRNA expression. RNA 20(2), 252–259 (2014).
- 29. . Real-time qRT-PCR assay for the detection of miRNAs using bi-directional extension sequences. Analyt. Biochem. 536, 32–35 (2017).
- 30. . Two-tailed RT-qPCR: a novel method for highly accurate miRNA quantification. Nucl. Acids Res. 45(15), e144 (2017).
- 31. . Highly specific real-time quantification of diverse microRNAs in human samples using universal primer set frame. Analyt. Biochem. 543, 71–78 (2018).
- 32. . miRNA quantification method using quantitative polymerase chain reaction in conjunction with C q method. Method. Mol. Biol. 1706, 257–265 (2018).
- 33. . Profiling of pre-micro RNAs and microRNAs using quantitative real-time PCR (qPCR) arrays. J. Vis. Exp. 46, pii: 2210 (2010).
- 34. . RT-qPCR-based quantification of small Non-Coding RNAs. Method. Mol. Biol. 1296, 85–102 (2015).
- 35. . Quantitative RT-PCR specific for precursor and mature miRNAs. Method. Mol. Biol. 1095, 121–134 (2014).
- 36. . Stem-loop RT-qPCR for miRNAs. Current Protocols in Molecular Biology (Chapter 15). Unit 15, 10 (2011).
- 37. . Stem-loop RT-PCR based quantification of small Non-Coding RNAs. Method. Mol. Biol. 1296, 103–108 (2015).
- 38. . A challenge for miRNA: multiple isomiRs in miRNAomics. Gene 544(1), 1–7 (2014).
- 39. . IsomiRs: expanding the miRNA repression toolbox beyond the seed. Biochim. Biophys. Acta Gene Regul. Mech.
pii: S1874-9399(18)30539-X (2019). - 40. A comprehensive, cell specific microRNA catalogue of human peripheral blood. Nucl. Acids Res. 45(16), 9290–9301 (2017).
- 41. . Knowledge about the presence or absence of miRNA isoforms (isomiRs) can successfully discriminate amongst 32 TCGA cancer types. Nucl. Acids Res. 45(6), 2973–2985 (2017).
- 42. miR-222 isoforms are differentially regulated by type-I interferon. RNA 24(3), 332–341 (2018).
- 43. Naturally existing isoforms of miR-222 have distinct functions. Nucl. Acids Res. 45(19), 11371–11385 (2017).
- 44. MicroRNAs and their isomiRs function cooperatively to target common biological pathways. Genome Biol. 12(12), R126 (2011).
- 45. . miRNA length variation during macrophage stimulation confounds the interpretation of results: implications for miRNA quantification by RT-qPCR. RNA 25(2), 232–238 (2019).
- 46. . Modified polyadenylation-based RT-qPCR increases selectivity of amplification of 3′-MicroRNA isoforms. Front. Genet. 9, 11 (2018).
- 47. . Assessment of isomiR discrimination using commercial qPCR methods. Non-Coding RNA 3(2), (2017).
- 48. DIANA-TarBase v8: a decade-long collection of experimentally supported miRNA-gene interactions. Nucl. Acids Res. 46(D1), D239–D245 (2018).
- 49. miRTarBase update 2018: a resource for experimentally validated microRNA-target interactions. Nucl. Acids Res. 46(D1), D296–D302 (2018).
- 50. . miRmine: a database of human miRNA expression profiles. Bioinformatics 33(10), 1554–1560 (2017).
- 51. The UCSC Genome Browser database: 2018 update. Nucl. Acids Res. 46(D1), D762–D769 (2018).
- 52. Ensembl 2018. Nucl. Acids Res. 46(D1), D754–D761 (2018).
- 53. Primer3: new capabilities and interfaces. Nucl. Acids Res. 40(15), e115 (2012).
- 54. BatchPrimer3: a high throughput web application for PCR and sequencing primer design. BMC Bioinformat. 9, 253 (2008).
- 55. . A tool for design of primers for microRNA-specific quantitative RT-qPCR. BMC Bioinformat. 15, 29 (2014).
- 56. . RTPrimerDB: the portal for real-time PCR primers and probes. Nucl. Acids Res. 37(Database issue), D942–D945 (2009).
- 57. . Mfold web server for nucleic acid folding and hybridization prediction. Nucl. Acids Res. 31(13), 3406–3415 (2003).
- 58. . MicroRNA detection specificity: recent advances and future perspective. Analyt. Chem. 91(5), 3179–3186 (2019).
- 59. . Profiling microRNA expression with microarrays. Trends Biotechnol. 26(2), 70–76 (2008).
- 60. . MicroRNA detection: current technology and research strategies. Annu. Rev. Anal. Chem. (Palo Alto Calif.) 8, 217–237 (2015).
- 61. An oligonucleotide microchip for genome-wide microRNA profiling in human and mouse tissues. Proc. Natl Acad. Sci. USA 101(26), 9740–9744 (2004).
- 62. . MicroRNA expression profiling using microarrays. Nat. Protocol. 3(4), 563–578 (2008).
- 63. . A custom microarray platform for analysis of microRNA gene expression. Nat. Method. 1(1), 47–53 (2004).
- 64. . Microarray-based, high-throughput gene expression profiling of microRNAs. Nat. Method. 1(2), 155–161 (2004).
- 65. A single-molecule method for the quantitation of microRNA gene expression. Nat. Method. 3(1), 41–46 (2006).
- 66. A novel multi-gene detection platform for the analysis of miRNA expression. Sci. Rep. 8(1), 10684 (2018).
- 67. Application of massively parallel sequencing to microRNA profiling and discovery in human embryonic stem cells. Genome Res. 18(4), 610–621 (2008).
- 68. Systematic comparison of microarray profiling, real-time PCR, and next-generation sequencing technologies for measuring differential microRNA expression. RNA 16(5), 991–1006 (2010).
- 69. . Robust global microRNA expression profiling using next-generation sequencing technologies. Lab. Invest. 94(3), 350–358 (2014).
- 70. . Reproducibility of quantitative RT-PCR array in miRNA expression profiling and comparison with microarray analysis. BMC Genomics 10, 407 (2009).
- 71. Concordance among digital gene expression, microarrays, and qPCR when measuring differential expression of microRNAs. BioTechniques 48(3), 219–222 (2010).
- 72. Evaluation of two commercial global miRNA expression profiling platforms for detection of less abundant miRNAs. BMC Genomics 12, 435 (2011).
- 73. . A comparison of miRNA isolation and RT-qPCR technologies and their effects on quantification accuracy and repeatability. BioTechniques 54(3), 155–164 (2013).
- 74. . Evaluation of three RT-qPCR-based miRNA detection methods using seven rice miRNAs. Biosci. Biotechnol. Biochem. 77(6), 1349–1353 (2013).
- 75. Evaluation of quantitative miRNA expression platforms in the microRNA quality control (miRQC) study. Nat. Method. 11(8), 809–815 (2014).
- 76. Absolute quantification by droplet digital PCR versus analog real-time PCR. Nat. Method. 10(10), 1003–1005 (2013).
- 77. . Considerations for digital PCR as an accurate molecular diagnostic tool. Clin. Chem. 61(1), 79–88 (2015).
- 78. . Normalization of microRNA expression levels in quantitative RT-PCR assays: identification of suitable reference RNA targets in normal and cancerous human solid tissues. RNA 14(5), 844–852 (2008).
- 79. . The use of microRNAs as reference genes for quantitative polymerase chain reaction in soybean. Analyt. Biochem. 406(2), 185–192 (2010).
- 80. . microRNAs as reference genes for quantitative PCR in cotton. PLoS One 12(4), e0174722 (2017).
- 81. . A novel mean-centering method for normalizing microRNA expression from high-throughput RT-qPCR data. BMC Res. Notes 4, 555 (2011).
- 82. . Normalization of miRNA qPCR high-throughput data: a comparison of methods. Biotechnol. Lett. 35(6), 843–851 (2013).
- 83. . A novel method for the normalization of microRNA RT-PCR data. BMC Med. Genom. 6(Suppl. 1), S14 (2013).
- 84. A novel and universal method for microRNA RT-qPCR data normalization. Genome Biol. 10(6), R64 (2009).
- 85. . Data normalization strategies for MicroRNA quantification. Clin. Chem. 61(11), 1333–1342 (2015).
- 86. Accurate normalization of real-time quantitative RT-PCR data by geometric averaging of multiple internal control genes. Genome Biol. 3(7), RESEARCH0034 (2002).
- 87. The MIQE guidelines: minimum information for publication of quantitative real-time PCR experiments. Clin. Chem. 55(4), 611–622 (2009).
- 88. Variability of the reverse transcription step: practical implications. Clin. Chem. 61(1), 202–212 (2015).
- 89. . Telomere length measurement by a novel monochrome multiplex quantitative PCR method. Nucl. Acids Res. 37(3), e21 (2009).