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A Protein Microarray Assay for Serological Determination of Antigen-specific Antibody Responses Following Clostridium difficile Infection
Published on: June 15, 2018
Detection and differentiation of Clostridium botulinum type A strains using a focused DNA microarray
Brian H Raphael1, Lavin A Joseph, Loretta M McCroskey
1Enteric Diseases Laboratory Branch, Centers for Disease Control and Prevention, Atlanta, GA 30329, USA. elx9@cdc.gov
Molecular and Cellular Probes
|January 9, 2010
Summary
A new microarray accurately differentiates Clostridium botulinum type A strains by analyzing variable genomic regions and detecting neurotoxin genes. This method rapidly assesses strain relatedness from different sources during outbreaks.
Area of Science:
- Microbiology
- Genomics
- Molecular Biology
Background:
- Clostridium botulinum causes botulism, a severe neuroparalytic illness.
- Accurate strain differentiation is crucial for epidemiological investigations and public health.
- Existing methods for C. botulinum typing can be time-consuming and complex.
Purpose of the Study:
- To develop and validate a focused oligonucleotide microarray for differentiating Clostridium botulinum type A strains.
- To enable rapid detection of neurotoxin genes and assess strain relatedness.
Main Methods:
- Design of a 62-probe microarray targeting Clostridium botulinum ATCC 3502 strain variable regions.
- Selection of variable regions based on comparative genomic hybridization of 10 type A strains.
- Inclusion of probes for neurotoxin genes (A-G), toxin gene cluster components (ha70, orfX1), and fldB.
- Testing on 27 subtype A1-A4 strains, including eight outbreak-related strain pairs from different sources.
Main Results:
- The microarray successfully differentiated C. botulinum type A strains.
- Identical hybridization patterns were observed for outbreak-related strains, indicating relatedness.
- Strain pairs from three outbreaks, possessing both bont/A and unexpressed bont/B genes, shared the same profile.
- The method demonstrated rapid neurotoxin gene detection and preliminary strain relatedness determination.
Conclusions:
- The focused oligonucleotide microarray is a rapid and effective tool for C. botulinum type A strain differentiation.
- This approach aids in identifying links between strains isolated from different sources during botulism outbreaks.
- The microarray facilitates preliminary epidemiological analysis by assessing strain relatedness.
