Evidence map›Paper›PMID 33741959›Full record

ArticleNature communications2021

An engineered CRISPR-Cas12a variant and DNA-RNA hybrid guides enable robust and rapid COVID-19 testing.

Kean Hean Ooi, Mengying Mandy Liu, Jie Wen Douglas Tay, Seok Yee Teo, Pornchai Kaewsapsak, Shengyang Jin, Chun Kiat Lee, Jingwen Hou, Sebastian Maurer-Stroh, Weisi Lin and 4 more

Open access · goldAbstract read
In one paragraph

Article in Nature communications, 2021. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 89 papers, 1 of them a synthesis that pooled it.

0numbers the graph read from it
0cells of the map it votes in
89citing papers in PubMed, 1 pooled it
13.2field-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

89 citing papers in PubMed, 1 synthesis or guideline pooled it, 205 citations in OpenAlex.

  1. Pooled it
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  4. Review
  5. Review
  6. Article
  7. Article
  8. Article
  9. Article
  10. Article
  11. Article
  12. CRISPR-assisted MoSMikrochimica acta · 2025
    Article
  13. Article
  14. Article
  15. AsCas12a tolerates insertions in target DNA.Nucleic acids research · 2025
    Article
  16. Review
  17. Review
  18. Article
  19. Article
  20. Article

29 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

14 authors at 3 institutions in 1 country.

Kean Hean Ooi *School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore.
Mengying Mandy Liu *School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore.ORCID 0000-0003-3121-2201
Jie Wen Douglas Tay *School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore.
Seok Yee Teo *School of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore.
Pornchai Kaewsapsak *Genome Institute of Singapore, Agency for Science Technology and Research, Singapore, Singapore.
Shengyang JinSchool of Biological Sciences, Nanyang Technological University, Singapore, Singapore.
Chun Kiat LeeDepartment of Laboratory Medicine, National University Hospital, National University Health System, Singapore, Singapore.ORCID 0000-0002-6065-0000
Jingwen HouSchool of Computer Science and Engineering, Nanyang Technological University, Singapore, Singapore.
Sebastian Maurer-StrohBioinformatics Institute, Agency for Science Technology and Research, Singapore, Singapore.ORCID 0000-0003-0813-9640
Weisi LinSchool of Computer Science and Engineering, Nanyang Technological University, Singapore, Singapore.
Benedict YanDepartment of Laboratory Medicine, National University Hospital, National University Health System, Singapore, Singapore.
Gabriel YanDivision of Infectious Diseases, Department of Medicine, National University Hospital, National University Health System, Singapore, Singapore.ORCID 0000-0003-3513-428X
Yong-Gui GaoSchool of Biological Sciences, Nanyang Technological University, Singapore, Singapore.
Meng How TanSchool of Chemical and Biomedical Engineering, Nanyang Technological University, Singapore, Singapore. mh.tan@ntu.edu.sg.ORCID 0000-0003-3627-5586
Agency for Science, Technology and Research · SGNanyang Technological University · SGNational University Hospital · SG

Funding

No grant is acknowledged in the PubMed record.

6 · The paper itself

Abstract

Extensive testing is essential to break the transmission of SARS-CoV-2, which causes the ongoing COVID-19 pandemic. Here, we present a CRISPR-based diagnostic assay that is robust to viral genome mutations and temperature, produces results fast, can be applied directly on nasopharyngeal (NP) specimens without RNA purification, and incorporates a human internal control within the same reaction. Specifically, we show that the use of an engineered AsCas12a enzyme enables detection of wildtype and mutated SARS-CoV-2 and allows us to perform the detection step with loop-mediated isothermal amplification (LAMP) at 60-65 °C. We also find that the use of hybrid DNA-RNA guides increases the rate of reaction, enabling our test to be completed within 30 minutes. Utilizing clinical samples from 72 patients with COVID-19 infection and 57 healthy individuals, we demonstrate that our test exhibits a specificity and positive predictive value of 100% with a sensitivity of 50 and 1000 copies per reaction (or 2 and 40 copies per microliter) for purified RNA samples and unpurified NP specimens respectively.

Indexed as

RNA, Guide, CRISPR-Cas SystemsBacterial ProteinsClustered Regularly Interspaced Short Palindromic RepeatsCOVID-19COVID-19 TestingCRISPR-Associated ProteinsCRISPR-Cas SystemsEndodeoxyribonucleasesHumansMolecular Diagnostic TechniquesMutationNasopharynxNucleic Acid Amplification TechniquesRNA, ViralSARS-CoV-2Sensitivity and SpecificityBacterial ProteinsCas12a proteinCRISPR-Associated ProteinsEndodeoxyribonucleasesRNA, Guide, CRISPR-Cas SystemsRNA, Viral

Identifiers

PMID33741959
PMCPMC7979722
OpenAlexW3137041909

What OpenQuestion holds

Textmetadata
LicenceCC BY
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.