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Potential variability of Leptospira serovars belonging to the same group
Abstract:
3 clone strains of monjakov and pomona serovars were cultured with prolongation in a medium containing homologous immune sera. Separate subcultures were cloned in a solid medium, while isolated clones were typed in microagglutination test with whole and absorbed immune sera and in some cases in an absorption test. The results showed that the mutants of subcultures with the minimal and maximal time of contact with the immune serum turned out to differ greatly from each other in antigenic properties. While antigenic mutants of earlier subcultures were constantly connected with serovars of Pomona serogroup, mutants of subcultures adapted to immune serum were serologically more related to butembo serovar of Cynoptery serogroup. The results obtained showing potential variability of serovars belonging to Pomona serogroup could be significant from the viewpoint of classification and phylogeny of Leptospira.
Insights
Culturing Leptospira serovars with immune serum revealed significant antigenic variations. Adapted mutants showed altered serological relationships, impacting Leptospira classification and phylogeny.
Area of Science:
- Microbiology
- Immunology
- Bacteriology
Background:
- Leptospira serovars, particularly those in the Pomona serogroup, exhibit complex antigenic properties.
- Understanding antigenic variability is crucial for accurate classification and phylogenetic analysis of Leptospira.
Purpose of the Study:
- To investigate the antigenic variability of Leptospira serovars when cultured in homologous immune sera.
- To determine if prolonged exposure to immune serum induces significant antigenic changes in Leptospira clones.
Main Methods:
- Culturing of Monjakov and Pomona serovars in media with homologous immune sera.
- Cloning of subcultures and subsequent antigenic typing using microagglutination and absorption tests.
- Analysis of antigenic properties of mutants with varying exposure times to immune serum.
Main Results:
- Mutants exposed to immune serum for minimal and maximal durations displayed distinct antigenic differences.
- Early subculture mutants retained serological characteristics of the Pomona serogroup.
- Mutants adapted to immune serum showed serological relatedness to the Cynoptery serogroup's Butembo serovar.
Conclusions:
- Prolonged culture in homologous immune serum can induce significant antigenic variability in Leptospira serovars.
- Observed variability suggests potential plasticity within the Pomona serogroup, impacting Leptospira classification.
- Findings highlight the importance of considering antigenic adaptability in Leptospira phylogeny and taxonomy.