Multilocus enzyme analysis of Legionella dumoffii

Area of Science:

• Microbiology
• Genetics
• Epidemiology

Background:

• Legionella dumoffii is a species of Legionella bacteria.
• Understanding genetic variability within bacterial species is crucial for epidemiological investigations and public health.

Purpose of the Study:

• To investigate the genetic variability among clinical and environmental strains of Legionella dumoffii.
• To compare the genetic diversity of L. dumoffii with L. pneumophila using multilocus enzyme analysis.
• To assess the utility of electromorph fingerprinting for epidemiological studies of L. dumoffii.

Main Methods:

• Multilocus enzyme analysis (MLEA) using starch gel electrophoresis was performed on 29 strains of L. dumoffii.
• Analysis covered 20 enzyme loci to identify electrophoretic types (ETs).
• DNA hybridization studies were conducted on representative strains to confirm genetic species.
• Comparison was made with 53 strains representing 53 ETs of L. pneumophila.

Main Results:

• The 29 L. dumoffii strains were resolved into five closely related electrophoretic types (ETs).
• These L. dumoffii ETs were clearly distinguished from the ETs of L. pneumophila.
• DNA hybridization confirmed that all L. dumoffii ETs belong to a single genetic species.
• MLEA indicated that L. dumoffii is a genetically uniform species.

Conclusions:

• Legionella dumoffii exhibits low genetic diversity, forming a single genetic species.
• Despite overall uniformity, sufficient genetic variability exists within L. dumoffii.
• Electromorph fingerprinting is a valuable tool for epidemiological studies involving Legionella dumoffii.