Comparative genetic analysis of Swiss and Spanish isolates of Echinococcus granulosus by southern hybridization and Random Amplified Polymorphic DNA technique.

This research paper studies the genetic differences found in Echinococcus granulosus, a type of parasite, originating from various hosts in Spain and Switzerland. The study utilized Southern hybridization and Random Amplified Polymorphic DNA techniques to identify unique genetic profiles for the different isolates.

Research Methodology

• The study used Echinococcus granulosus taken from various intermediate hosts in Spain and Switzerland.
• Researchers isolated Genomic DNAs from these parasites and subjected them to two different analysis techniques: Southern hybridization using different probes and Random Amplified Polymorphic DNA (RAPD) method for DNA amplification.
• Both these methods gave characteristic banding patterns or genetic profiles for the various isolates of E. granulosus.

Research Findings

• The unique banding patterns allowed researchers to classify the isolates or metacestodes into multiple groups based on homologous or similar profiles.
• These groups were: (a) isolates of horse and donkey origin from both countries, (b) isolates of cattle origin from Switzerland only, (c) isolates of sheep, cattle, and human origin from Spain, and (d) isolates of pig origin from both Spain and Switzerland and of goat origin only from Spain.
• RAPD technique revealed two isolates of human origin from Switzerland exhibited banding patterns distinct from any of the other groups (a-d).

Conclusion

• The conclusions from the study provide evidence that the biological and morphological differences found in various strains of E. granulosus can also be detected at the genetic level.
• The research highlights the value of using molecular biological techniques such as Southern hybridization and RAPD in studying genetic differences among parasite strains.