Barcode sequence could be a good target for developing a species-specific anti-parasite agent based on CRISPR-Cas9

Area of Science:

• Molecular Biology
• Parasitology
• Biotechnology

Background:

• Parasitic infections pose a significant global health challenge.
• Developing targeted, species-specific parasiticidal agents is crucial for effective treatment.
• The DNA barcode sequence (ITS-2) in parasites offers a potential target for novel therapies.

Purpose of the Study:

• To investigate the potential of targeting DNA barcode sequences with CRISPR-Cas9 for parasiticidal activity.
• To develop species-specific parasiticidal agents for treating parasitic diseases.
• To assess the efficacy of sgRNAs targeting ITS-2 and 5.8S rDNA in Cryptocaryon irritans.

Main Methods:

• Design of single-guide RNAs (sgRNAs) targeting ITS-2 and 5.8S rDNA in Cryptocaryon irritans.
• In vivo testing of Cas9 mRNA mixed with sgRNAs on parasite life stages (tomont and theront).
• Quantitative Real-time PCR and DNA sequencing to assess DNA disruption and mutations.

Main Results:

• Exposure to Cas9 mRNA and sgRNAs significantly reduced tomont hatching and theront survival rates.
• Quantitative Real-time PCR confirmed significant DNA disruption in exposed parasites.
• DNA sequencing revealed Cas9-induced mutations and large deletions in targeted parasite DNA.

Conclusions:

• Targeting DNA barcode sequences with CRISPR-Cas9 is a viable strategy for developing parasiticidal agents.
• This approach shows promise for novel nucleic acid therapeutics against cryptocaryoniasis and other parasitic infections.
• The study provides a foundation for creating species-specific parasiticidal agents with high precision.