Computer-aided densitometric analysis of protein patterns of Clostridium difficile

Area of Science:

• Microbiology
• Molecular Biology
• Biochemistry

Background:

• Clostridium difficile is a significant cause of healthcare-associated infections.
• Accurate and efficient typing methods are crucial for infection control and epidemiological studies.
• Whole-cell protein profiling offers a potential avenue for bacterial strain differentiation.

Purpose of the Study:

• To evaluate the utility of sodium dodecylsulfate-polyacrylamide gel electrophoresis (SDS-PAGE) for Clostridium difficile typing.
• To establish a standardized and reproducible method for analyzing protein patterns.
• To assess the discriminatory power of protein electrophoresis for epidemiological investigations.

Main Methods:

• Analysis of whole-cell protein patterns from 227 Clostridium difficile strains using SDS-PAGE.
• Computer-aided densitometric analysis for standardization and classification of protein profiles.
• Electronic superimposition and comparison of normalized electrophoretic tracks.

Main Results:

• A reliable standardization technique was established using computer-aided densitometry.
• The method demonstrated high reproducibility, with negligible influence from sample preparation.
• 35 distinct subgroups of Clostridium difficile were identified, with further discrimination possible.
• Epidemiologically related strains showed identical protein patterns, enabling unequivocal identification.

Conclusions:

• Protein electrophoresis, coupled with densitometric analysis, is a valuable and reproducible method for typing Clostridium difficile isolates.
• This technique facilitates efficient classification and differentiation of strains for epidemiological purposes.
• The method allows for the identification of clonally related Clostridium difficile strains.