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Rapid and Ultrasensitive Detection of Methicillin-Resistant Staphylococcus aureus Based on CRISPR-Cas12a Combined

Ying Wang1, Xuan Liang1, Jie Xu1

  • 1Department of Epidemiology, College of Public Health, Zhengzhou University, Zhengzhou, China.

Frontiers in Microbiology
|June 20, 2022
PubMed

Insights

Rapid detection of methicillin-resistant Staphylococcus aureus (MRSA) is crucial for infection control. A new CRISPR-Cas12a and recombinase-aided amplification (RAA) method offers ultrasensitive and specific MRSA identification in clinical samples within 60 minutes.

Area of Science:

  • Microbiology
  • Molecular Biology
  • Biotechnology

Background:

  • Methicillin-resistant Staphylococcus aureus (MRSA) presents a significant global health challenge due to high mortality rates in hospital and community-acquired infections.
  • Rapid and ultrasensitive detection methods are essential for timely MRSA infection control.
  • CRISPR-Cas systems offer programmable, sensitive, and specific nucleic acid detection.

Purpose of the Study:

  • To develop and validate a novel method for rapid and ultrasensitive detection of MRSA in clinical samples.
  • To combine CRISPR-Cas12a technology with recombinase-aided amplification (RAA) for enhanced detection capabilities.
  • To evaluate the sensitivity, specificity, and clinical applicability of the developed RAA-Cas12a assay.

Main Methods:

  • Development of a CRISPR-Cas12a-based assay coupled with recombinase-aided amplification (RAA).
  • Utilized a fluorescent readout for quantitative detection of MRSA.
  • Tested the assay's performance using clinical samples, comparing results with antimicrobial susceptibility testing (AST) and polymerase chain reaction (PCR).

Main Results:

  • The RAA-Cas12a method achieved a limit of detection (LoD) as low as 10 copies/μl within a 60-minute reaction time.
  • Demonstrated high specificity, successfully distinguishing MRSA from other common clinical bacteria.
  • Showed excellent agreement with established AST and PCR methods across 83 clinical samples.

Conclusions:

  • The RAA-Cas12a assay provides a highly sensitive and specific platform for rapid MRSA detection.
  • This method holds significant potential for timely diagnosis and management of MRSA infections in clinical settings.
  • The integration of RAA and CRISPR-Cas12a offers a valuable tool for combating MRSA infections.
Keywords:
CRISPR-Cas12aMRSARAAStaphylococcus aureusdetection

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