Evidence map›Paper›PMID 29073095›Full record

ArticleProceedings of the National Academy of Sciences of the United States of America2017

Broad role for YBX1 in defining the small noncoding RNA composition of exosomes.

Matthew J Shurtleff, Jun Yao, Yidan Qin, Ryan M Nottingham, Morayma M Temoche-Diaz, Randy Schekman, Alan M Lambowitz

Open access · bronzeAbstract read
In one paragraph

Article in Proceedings of the National Academy of Sciences of the United States of America, 2017. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 232 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
232citing papers in PubMed, 1 pooled it
13.0field-weighted citation impact, top 1% 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

232 citing papers in PubMed, 1 synthesis or guideline pooled it, 347 citations in OpenAlex.

  1. Pooled it
  2. Article
  3. Article
  4. Article
  5. YBX1 regulates RNA polymerase III transcripts to prevent inflammation.Proceedings of the National Academy of Sciences of the United States of America · 2026
    Article
  6. Article
  7. Article
  8. Article
  9. Article
  10. Review
  11. Article
  12. Article
  13. Article
  14. Article
  15. Review
  16. Review
  17. Review
  18. Review
  19. Article
  20. Review

172 more citing papers are in PubMed but not listed here.

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

7 authors at 3 institutions in 1 country.

Matthew J ShurtleffDepartment of Molecular and Cellular Biology, University of California, Berkeley, CA 94720.
Jun YaoInstitute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712.
Yidan QinInstitute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712.
Ryan M NottinghamInstitute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712.
Morayma M Temoche-DiazDepartment of Plant and Microbial Biology, University of California, Berkeley, CA 94720.
Randy SchekmanDepartment of Molecular and Cellular Biology, University of California, Berkeley, CA 94720; schekman@berkeley.edu lambowitz@austin.utexas.edu.ORCID 0000-0001-8615-6409
Alan M LambowitzInstitute for Cellular and Molecular Biology, University of Texas at Austin, Austin, TX 78712; schekman@berkeley.edu lambowitz@austin.utexas.edu.
The University of Texas at Austin · USUniversity of California, Berkeley · USHoward Hughes Medical Institute · US

Funding

RETROPLASMID AND GROUP II INTRON REVERSE TRANSCRIPTASESR01GM037949 · NIGMS · UNIVERSITY OF TEXAS AUSTIN · PI LAMBOWITZ, ALAN M. · 1986 to 2019
$8.6M
Howard Hughes Medical InstituteNIGMS NIH HHS R01 GM037949
6 · The paper itself

Abstract

RNA is secreted from cells enclosed within extracellular vesicles (EVs). Defining the RNA composition of EVs is challenging due to their coisolation with contaminants, lack of knowledge of the mechanisms of RNA sorting into EVs, and limitations of conventional RNA-sequencing methods. Here we present our observations using thermostable group II intron reverse transcriptase sequencing (TGIRT-seq) to characterize the RNA extracted from HEK293T cell EVs isolated by flotation gradient ultracentrifugation and from exosomes containing the tetraspanin CD63 further purified from the gradient fractions by immunoisolation. We found that EV-associated transcripts are dominated by full-length, mature transfer RNAs (tRNAs) and other small noncoding RNAs (ncRNAs) encapsulated within vesicles. A substantial proportion of the reads mapping to protein-coding genes, long ncRNAs, and antisense RNAs were due to DNA contamination on the surface of vesicles. Nevertheless, sequences mapping to spliced mRNAs were identified within HEK293T cell EVs and exosomes, among the most abundant being transcripts containing a 5' terminal oligopyrimidine (5' TOP) motif. Our results indicate that the RNA-binding protein YBX1, which is required for the sorting of selected miRNAs into exosomes, plays a role in the sorting of highly abundant small ncRNA species, including tRNAs, Y RNAs, and Vault RNAs. Finally, we obtained evidence for an EV-specific tRNA modification, perhaps indicating a role for posttranscriptional modification in the sorting of some RNA species into EVs. Our results suggest that EVs and exosomes could play a role in the purging and intercellular transfer of excess free RNAs, including full-length tRNAs and other small ncRNAs.

Indexed as

AnimalsDNAExosomesExtracellular VesiclesGene Expression RegulationHEK293 CellsHumansRNA, Small UntranslatedY-Box-Binding Protein 1DNARNA, Small UntranslatedY-Box-Binding Protein 1YBX1 protein, humanextracellular vesicleposttranscriptional modificationRNA-binding proteinRNA-seqthermostable group II intron reverse transcriptase

Identifiers

PMID29073095
PMCPMC5663387
OpenAlexW2952961321

What OpenQuestion holds

Textmetadata
LicenceCC BY-NC-ND
Read underepoch 390

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.