Extrachromosomal nucleic acids in bovine Babesia

Area of Science:

• Veterinary Parasitology
• Molecular Biology
• Microbiology

Background:

• Bovine babesiosis is a significant disease affecting cattle globally.
• The genetic makeup of Babesia species, particularly Babesia bovis and Babesia bigemina, is not fully understood.
• Extrachromosomal nucleic acid elements can play roles in pathogen biology and evolution.

Purpose of the Study:

• To identify and characterize small extrachromosomal nucleic acid elements in Babesia bovis and Babesia bigemina.
• To investigate the nature and relationship of these elements within and between the two parasite species.

Main Methods:

• Isolation and purification of nucleic acids from Babesia isolates.
• Molecular size determination of nucleic acid elements.
• Double-stranded RNA and DNA characterization.
• Southern blot analysis using restriction enzyme digestion and DNA fragment comparison.

Main Results:

• Two distinct extrachromosomal nucleic acid elements were identified in bovine babesias.
• One element is a double-stranded RNA (dsRNA) of approximately 5.5 kilobase pairs (kbp), potentially related to virus-like particles.
• The second element is a double-stranded DNA (dsDNA) of about 6.2 kbp, found in both Babesia bovis and Babesia bigemina.

Conclusions:

• Babesia bovis and Babesia bigemina harbor unique extrachromosomal nucleic acid elements.
• The dsDNA element shows conservation across these two important Babesia species.
• Further research into these elements may reveal insights into Babesia biology, virulence, and potential targets for control.