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[Genetic differentiation with restriction patterns between pathogenic and non-pathogenic monoxenic Entamoeba
P Crisóstomo Vázquez1, E Jiménez Cardoso
1Laboratorio de Investigación en Parasitología, Hospital Infantil de México, Federico Gómez.
Unlabelled:
Cysteine-proteinase of Entamoeba histolytica have been considered implicated like important virulence factors in the pathogenesis of amebiasis. On the basis of the differences in ethnic gene that encodes to 30 kDa proteinase. The present study validated a strategy to differentiate strains of pathogenic and non-pathogenic Entamoeba histolytica by restriction patterns.
Materials And Methods:
Thirteen stool samples with Entamoeba histolytica cyst from 4 asymptomatic and 9 symptomatic patients ages and sex different into Robinson' medium were used. DNA obtained was used by amplified gene ethnic and it was cut with restriction enzyme Taq I and Hinf I.
Results:
All strains were cultivated into Robinson's medium. A 530 bp fragment which hybridated with probe for Entamoeba histolytica was obtained. By the way valuation by restriction patterns with Taq I and Hinf I show that two of four samples of asymptomatic patients belong to pathogenic strain. It agrees with control strain positive HM-1:IMSS. Last 9 belonged to symptomatic patients with pathogenic strain.
Conclusions:
These results indicate that ethnic amplified by polymerase chain reaction is insufficiently to establish differential diagnostic. Therefore is necessary carry out enzyme digestion to identify pathogenic strain.
Insights
Differentiating Entamoeba histolytica strains is crucial for amebiasis pathogenesis. Restriction enzyme analysis of amplified DNA effectively distinguishes pathogenic from non-pathogenic strains, aiding diagnosis.
Area of Science:
- Microbiology
- Molecular Biology
- Parasitology
Context:
- Entamoeba histolytica cysteine-proteinases are key virulence factors in amebiasis pathogenesis.
- Genetic variations in the 30 kDa proteinase gene exist between Entamoeba histolytica strains.
- Distinguishing pathogenic from non-pathogenic Entamoeba histolytica is essential for effective disease management.
Purpose:
- To validate a molecular strategy for differentiating pathogenic and non-pathogenic Entamoeba histolytica strains.
- To assess the utility of restriction fragment length polymorphism (RFLP) analysis for strain differentiation.
- To investigate the role of specific restriction enzymes (Taq I and Hinf I) in identifying virulent Entamoeba histolytica.
Summary:
- DNA from 13 Entamoeba histolytica stool samples was amplified and digested with Taq I and Hinf I.
- Restriction patterns revealed that two of four asymptomatic patient samples harbored pathogenic strains, similar to the control HM-1:IMSS.
- All nine symptomatic patients were infected with pathogenic Entamoeba histolytica strains.
Impact:
- Restriction pattern analysis, combined with polymerase chain reaction, provides a reliable method for differentiating pathogenic Entamoeba histolytica strains.
- This technique can aid in the differential diagnosis of amebiasis by identifying the etiological agent's virulence.
- Enzyme digestion is necessary for accurate identification of pathogenic strains, complementing PCR-based methods.