Evidence map›Paper›PMID 30177820›Full record

ArticleScientific reports2018

Unique Molecular Identifiers reveal a novel sequencing artefact with implications for RNA-Seq based gene expression analysis.

Johnny A Sena, Giulia Galotto, Nico P Devitt, Melanie C Connick, Jennifer L Jacobi, Pooja E Umale, Luis Vidali, Callum J Bell

Open access · goldAbstract read
In one paragraph

Article in Scientific reports, 2018. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 21 papers.

0numbers the graph read from it
0cells of the map it votes in
21citing papers in PubMed
2.7field-weighted citation impact, top 9% of its field
1 · What the graph read from it

What it found

Each row is one number read from the abstract, on the scale the paper reported it, with its interval. Left of the dashed line favours the treatment, right favours the comparator. Under each row is the sentence it came from. New to these charts? A ten-minute tutorial.

The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.

2 · The registry

The trial behind it

Trials whose registry record cites this paper, or whose number appears in the abstract. A trial that started after this paper was published is citing it as background, not reporting it.

Neither the registry nor the abstract names a trial number. If this is a trial report, that itself is worth knowing.

3 · Its place in the literature

Who cites it

21 citing papers in PubMed, 45 citations in OpenAlex.

  1. Article
  2. Article
  3. Article
  4. Review
  5. Single-Cell Multiomics.Annual review of biomedical data science · 2023
    Review
  6. Article
  7. Review
  8. Article
  9. Article
  10. Accurate Prediction of Protein Sequences for Proteogenomics Data Integration.Methods in molecular biology (Clifton, N.J.) · 2022
    Article
  11. Article
  12. Article
  13. Review
  14. Review
  15. Review
  16. Review
  17. Article
  18. Article
  19. RNA sequencing: the teenage years.Nature reviews. Genetics · 2019
    Review
  20. Article
4 · The record

Corrections and comments

PubMed lists nothing against this paper. Absence here is not a guarantee, only a check that was made.

5 · Who and what money

Authors and funding

8 authors at 2 institutions in 1 country.

Johnny A SenaNational Center for Genome Resources, Santa Fe, NM, 87505, United States.ORCID 0000-0003-1846-8739
Giulia GalottoWorcester Polytechnic Institute, Department of Biology and Biotechnology, Worcester, MA, 01609, United States.
Nico P DevittNational Center for Genome Resources, Santa Fe, NM, 87505, United States.
Melanie C ConnickNational Center for Genome Resources, Santa Fe, NM, 87505, United States.
Jennifer L JacobiNational Center for Genome Resources, Santa Fe, NM, 87505, United States.
Pooja E UmaleNational Center for Genome Resources, Santa Fe, NM, 87505, United States.
Luis VidaliWorcester Polytechnic Institute, Department of Biology and Biotechnology, Worcester, MA, 01609, United States.
Callum J BellNational Center for Genome Resources, Santa Fe, NM, 87505, United States. cjb@ncgr.org.ORCID 0000-0002-8950-5077
National Center for Genome Resources · USWorcester Polytechnic Institute · US

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Attaching Unique Molecular Identifiers (UMI) to RNA molecules in the first step of sequencing library preparation establishes a distinct identity for each input molecule. This makes it possible to eliminate the effects of PCR amplification bias, which is particularly important where many PCR cycles are required, for example, in single cell studies. After PCR, molecules sharing a UMI are assumed to be derived from the same input molecule. In our single cell RNA-Seq studies of Physcomitrella patens, we discovered that reads sharing a UMI, and therefore presumed to be derived from the same mRNA molecule, frequently map to different, but closely spaced locations. This behaviour occurs in all such libraries that we have produced, and in multiple other UMI-containing RNA-Seq data sets in the public domain. This apparent paradox, that reads of identical origin map to distinct genomic coordinates may be partially explained by PCR stutter, which is often seen in low-entropy templates and those containing simple tandem repeats. In the absence of UMI this artefact is undetectable. We show that the common assumption that sequence reads having different mapping coordinates are derived from different starting molecules does not hold. Unless taken into account, this artefact is likely to result in over-estimation of certain transcript abundances, depending on the counting method employed.

Indexed as

ArtifactsGene Expression Regulation, PlantGenome, PlantBryopsidaChromosome MappingComputational BiologyGene LibraryHigh-Throughput Nucleotide SequencingMicrosatellite RepeatsRNA, MessengerRNA, PlantSequence Analysis, RNASingle-Cell AnalysisRNA, MessengerRNA, Plant

Identifiers

PMID30177820
PMCPMC6120941
OpenAlexW2889101968

What OpenQuestion holds

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LicenceCC BY
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Registered trials

None linked

Read under generation 80e0d062 · epoch 390. Bibliography from PubMed, PubMed Central and OpenAlex; grants from NIH RePORTER; trial links from ClinicalTrials.gov; estimates, votes and beliefs from the OpenQuestion graph.