CRISPR Genome Editing Breakthrough in Giant Freshwater Prawn

 

Introduction

The giant freshwater prawn (Macrobrachium rosenbergii) is one of the most economically important species in global aquaculture. Despite its high commercial and nutritional value, genetic improvement in this species has long been limited by the lack of efficient genome editing tools. Recent advances now mark a turning point with the successful establishment of a CRISPR/Cas9-based genome editing system specifically optimized for this prawn.



Establishing an Efficient Editing System

Researchers developed a reliable microinjection workflow by optimizing controlled mating, embryo collection, and developmental staging. One-cell embryos collected within 0.5–2 hours post-fertilization were identified as the ideal injection window. Fine-tuning the injection needle tip to approximately 1 μm significantly reduced mechanical damage, lowering early embryo mortality to around 10%. These refinements made the system both reproducible and scalable.

Successful Target Gene Editing

To validate the platform, two biologically important genes were targeted. Editing of the eye-development gene MrPAX6 resulted in a 46.9% mutation rate, accompanied by a visible 50% reduction in eye pigment area, providing clear phenotypic confirmation. Editing of the sex-related gene MrIAG achieved an impressive 84% mutation efficiency, with approximately 35% survival to hatching, demonstrating the robustness of the approach.

Significance for Aquaculture and Research

This is the first efficient and reproducible CRISPR/Cas9 genome editing system established in M. rosenbergii. The platform opens new avenues for functional genomics, sex control strategies, growth improvement, and disease resistance breeding. Ultimately, this breakthrough has the potential to accelerate sustainable genetic improvement in freshwater prawn aquaculture.

Conclusion

The successful application of CRISPR/Cas9 in Macrobrachium rosenbergii represents a major milestone in crustacean biotechnology. With high editing efficiency and manageable embryo survival, this system lays a strong foundation for future research and commercial innovation in aquaculture genetics.


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