Cited by 22MicroRNA in disease regulationPlant Molecular Biology ResearchCancer-related molecular mechanisms research

Integrated analysis of directly captured microRNA targets reveals the impact of microRNAs on mammalian transcriptome

Open access
Bjerke, Glen A., Yi, Rui·2020·RNA

Published version of a preprint

Abstract

MicroRNA (miRNA)-mediated regulation is widespread, relatively mild but functionally important. It remains challenging to unequivocally identify miRNA targeted RNAs at a genomic scale and determine how changes in miRNA levels affect the transcriptome. Here, we captured individual miRNAs and their targeted RNA sites in wild-type, miR-200 family knockout and induced epithelial cells. We detected 1797 miRNAs interacting with 13,830 transcripts at 616,127 sites by sequencing 1,230,019 unique miRNA:RNA chimeras. Although mRNA sites that are bound by miRNAs and contain matches to seed sequences confer the strongest regulation, ∼40%–60% of miRNA bound regions do not contain seed matches. Different miRNAs have different preferences to seed matches and 3′ end base-pairing. For individual miRNAs, the effectiveness of mRNA regulation is highly correlated with the number of captured miRNA:mRNA chimeras. Notably, elevated miR-200 expression robustly represses existing targets with little impact on newly recognized targets. Global analysis of directly captured mRNA targets reveals pathways that are involved in cancer and cell adhesion and signaling pathways that are highly regulated by many different miRNAs in epithelial cells. Comparison between experimentally captured and TargetScan predicted targets indicates that our approach is more effective in identifying bona fide targets by reducing false positive and negative predictions. This study reveals the global binding landscape and impact of miRNAs on the mammalian transcriptome.

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Crossref · 10.1261/rna.073635.119

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  • Chimeric CLIP-seq approaches incorporate a phosphorylation step and an additional ligation step to increase the frequency of chimeric fragments to as much as 5.3%, although it often remains less than 2%.

    “chimeric CLIP-seq approaches (including CLASH, CLEAR-CLIP, and modified iPAR-CLIP) have modified this approach by incorporating both a phosphorylation step (using 3' phosphatase minus T4 Polynucleotide Kinase) as well as an additional ligation step (without adapters) to encourage proximity-based ligation and increase the frequency of chimeric fragments to as much as 5.3%, although it often remains”

    From Scalable and deep profiling of mRNA targets for individual microRNAs with chimeric eCLIP (2022) · cites this paper as Bjerke and Yi, 2020

    The Introduction (page unavailable) says CLEAR-CLIP adds a ligation step to improve the low frequency of chimeric reads in the original CLASH study. The passages do not substantiate the claimed phosphorylation step, the 5.3% or less-than-2% frequencies, or the inclusion of modified iPAR-CLIP. (LLM, conf=0.85)

    Experimental — accuracy not yet measured
  • Widespread adoption of chimeric CLIP methods remains limited because poor recovery of AGO-crosslinked RNA and low fraction of chimeric reads make it difficult to deeply profile the interactome of a miRNA of interest at a reasonable cost.

    “However, despite the obvious power of direct experimental identification of miRNA targets and recent efforts to improve the efficiency of these approaches in capturing additional chimeric molecules (Bjerke and Yi, 2020;Gay et al., 2018), widespread adoption of these methods remains limited, as both the poor recovery of AGO-crosslinked RNA as well as the low fraction of chimeric reads make it”
  • Chimeric CLIP can both refine computationally predicted targets and reveal new targets not captured by prediction alone.

    “matching previous findings that chimeric CLIP can both refine computationally predicted targets as well as reveal new targets not captured by prediction alone (Bjerke and Yi, 2020).”

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Authors
Bjerke, G. A., & Yi, R.
Affiliations
University of Colorado Boulder (US)
Corresponding author
Yi, Rui
Venue
RNA
Published
2020-01-03
Volume
26
Issue
3
Pages
306-323
ISSN
  • 1355-8382 (ISSN-L)
  • 1469-9001
OpenAlex
W2998484034
Cited by
22
References
42
Citations by year
2026: 2 · 2025: 1 · 2024: 3 · 2023: 4 · 2022: 6 · 2021: 4 · 2020: 2
FWCI
1.37
Type
journal article
Language
en
Open access
Locations
  • RNA (publishedVersion)
  • bioRxiv (Cold Spring Harbor Laboratory) (acceptedVersion)
  • PubMed Central (publishedVersion, cc-by-nc)
  • PubMed (publishedVersion)
  • HighWire Press Open Archive (submittedVersion)
Funders
  • National Institute of Arthritis and Musculoskeletal and Skin Diseases of the National Institutes of Health (R01AR059697, R01AR066703)
  • National Institutes of Health
  • American Cancer Society postdoctoral fellowship (129540-PF-16-059-01-RMC)
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › MicroRNA in disease regulation
  • Life Sciences › Agricultural and Biological Sciences › Plant Science › Plant Molecular Biology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Cancer Research › Cancer-related molecular mechanisms research
Keywords
microRNA, miRNA target identification, miR-200 family, seed sequence, mRNA regulation, transcriptome, epithelial cells, cell adhesion, cancer pathways, TargetScan, false positive reduction
MeSH terms
Animals, Cell Adhesion, Humans, Mammals, Neoplasms, RNA, Messenger, Signal Transduction, Gene Expression Regulation, Neoplastic, MicroRNAs, Gene Regulatory Networks, Transcriptome

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