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Related Concept Videos

Modern Molecular Taxonomy01:29

Modern Molecular Taxonomy

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Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...
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Bacterial identification relies on a diverse array of techniques to classify and understand microorganisms, each tailored to uncover specific characteristics. Traditional morphological approaches, while still valuable, are limited for closely related or structurally simple organisms. Modern methods integrate biochemical, serological, genetic, and advanced molecular tools to achieve greater accuracy.Morphological and Biochemical TechniquesMorphological characteristics, such as cell shape and...
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Tuberculosis, more commonly referred to as TB, is an infectious disease stemming from Mycobacterium tuberculosis. While it primarily impacts the lungs, TB can also affect other body areas. Given its severity and global impact, timely and accurate diagnosis is crucial for controlling its spread and improving patient outcomes.
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Related Experiment Video

Updated: Aug 15, 2025

Identification of Mycobacterium Species by DNA Microarray Chip Method
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CRISPR-Based Detection, Identification and Typing of Mycobacterium tuberculosis Complex Lineages.

A Padane1,2,3, Z Harouna Hamidou1,2,4, M Drancourt1

  • 1Aix-Marseille-Université, IRD, MEPHI, IHU Méditerranée Infection, Marseille, France.

Microbiology Spectrum
|January 5, 2023
PubMed
Summary

Researchers identified the CRISPR-csm4 gene as a specific marker for detecting Mycobacterium tuberculosis complex (MTC) in clinical samples. This new RT-PCR assay accurately identifies MTC and its Beijing lineage, complementing existing tuberculosis diagnostic tools.

Keywords:
Beijing lineageCRISPR-csm4GeneXpertMycobacterium tuberculosis complexPCRclinical diagnosislineagestuberculosis

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Area of Science:

  • Microbiology
  • Genomics
  • Molecular Diagnostics

Background:

  • Polymerase chain reaction (PCR)-based detection of Mycobacterium tuberculosis complex (MTC) is crucial for diagnosing tuberculosis in clinical microbiology labs.
  • Current diagnostic methods require improvement for specificity and lineage identification.

Purpose of the Study:

  • To identify a specific gene for MTC detection using genome-wide profiling.
  • To develop and validate a novel diagnostic assay for MTC and its lineages.

Main Methods:

  • Genome-wide profiling of 3,156 mycobacterial genomes using Roary.
  • Real-time PCR (RT-PCR) and PCR-sequencing targeting the identified CRISPR-csm4 gene.
  • Validation using MTC and non-tuberculous mycobacteria isolates, and clinical samples.

Main Results:

  • The CRISPR-csm4 gene was identified as specific for MTC.
  • The CRISPR-csm4 assay accurately detected all 20 MTC isolates and none of the 5 non-tuberculous mycobacteria.
  • Clinical sample evaluation showed expected results for all 65 samples, including MTC Beijing lineage identification.

Conclusions:

  • CRISPR-csm4-based RT-PCR and PCR-sequencing offer a specific method for MTC detection.
  • This assay can complement existing tuberculosis diagnostics, enhancing MTC pathogen identification and lineage differentiation.
  • The findings support the implementation of CRISPR-csm4 assays in clinical microbiology laboratories.