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Related Concept Videos

Rapid Identification of Pathogens01:25

Rapid Identification of Pathogens

MALDI-TOF MS has transformed clinical microbiology by offering a rapid and reliable method for pathogen identification. The traditional approach to microbial identification typically involves time-consuming culture techniques and biochemical tests, which can delay the initiation of appropriate antimicrobial therapy. MALDI-TOF MS avoids these delays by using characteristic ribosomal protein mass patterns of microbial cells, enabling accurate species-level identification within minutes.Principle...

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Rapid, Amplification-free, RNA-based Uropathogen Detection With LbuCas13a.

Hirotaka Ata1,2, Madeleine E Hull1, William M Geisler3

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Summary

A new Clustered Regularly Interspaced Short Palindromic Repeats (CRISPR) RNA detection platform provides rapid bacterial identification in urine within one hour. This advancement offers faster results than traditional bacterial cultures or PCR for diagnosing urinary tract infections (UTIs).

Keywords:
CRISPR diagnosticsRNA diagnosticsUTIemergency medicine

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Area of Science:

  • Biotechnology
  • Molecular Diagnostics
  • Microbiology

Background:

  • Urgent need for rapid bacterial infection diagnostics in emergency settings.
  • Current methods like bacterial cultures (24-72 hours) and PCR (several hours) are time-consuming.
  • CRISPR technology offers a potential solution for faster pathogen detection.

Purpose of the Study:

  • To develop and validate a rapid bacterial RNA detection platform using CRISPR technology.
  • To achieve a urine-to-result time of under 1 hour for bacterial identification.
  • To assess the assay's compatibility with human urine and its diagnostic performance for urinary tract infections (UTIs).

Main Methods:

  • CRISPR experiments conducted as open-format plate reader assays with fluorescent readouts.
  • Derivation studies involved spiking *Escherichia coli* 16S rRNA into human urine to determine assay compatibility and limit of detection.
  • Validation studies used patient-derived raw urine to assess assay concordance with UTI diagnosis.

Main Results:

  • The CRISPR assay demonstrated a lower limit of detection of approximately 10^6 copies/µL in human urine.
  • Overall sensitivity was 75% for combined Gram-negative and Gram-positive UTIs.
  • When used postanalytically with conventional urinalysis, the combined diagnostic schema achieved 100% specificity and positive predictive value, with results in under 1 hour.

Conclusions:

  • Demonstrated feasibility of an amplification-free CRISPR assay for rapid uropathogen detection.
  • This represents the first RNA-based tool for detecting uropathogens.
  • The assay can enhance UTI diagnosis specificity when used postanalytically with conventional urinalysis; future work aims to improve sensitivity and differentiate pathogens from contaminants.