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DNA-based Fish Species Identification Protocol
Published on: April 28, 2010
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Twenty-three years of PCR-based seafood authentication assay development: What have we learned?
Maleeka Singh1, Robert G Young2, Rosalee S Hellberg3
1Department of Food Science, University of Guelph, Guelph, Ontario, Canada.
Comprehensive Reviews in Food Science and Food Safety
|July 29, 2024
Summary
Seafood fraud is rising, necessitating reliable DNA-based identification. A review of 313 assays found many lack species specificity, highlighting the need for standardized DNA testing methods in fish authentication.
Area of Science:
- Molecular Biology
- Food Science
- Forensic Science
Background:
- Seafood fraud is a significant global issue driven by complex supply chains and high consumer demand.
- Accurate species identification is challenging once seafood is processed, increasing vulnerability to fraudulent practices.
- DNA-based methods offer powerful tools for authenticating seafood products.
Purpose of the Study:
- To review and analyze DNA-based methods for commercial fish authentication published between 2000 and 2023.
- To identify common fish species, DNA-based techniques, and gene regions utilized in assay development.
- To assess the specificity of existing DNA assays and provide recommendations for standardized reporting.
Main Methods:
- Systematic literature review of 191 articles published over 23 years.
- Analysis of 313 original DNA-based assays for fish species detection and authentication.
- In silico testing of published tuna assays targeting the cytb region using multiple sequence alignment for primer mismatch analysis.
Main Results:
- Real-time polymerase chain reaction (qPCR) and DNA sequencing were the most frequently employed methods.
- The cytb (cytochrome b) and COI (cytochrome c oxidase 1) gene regions were most commonly targeted.
- A case study revealed that most published tuna assays targeting cytb lacked species specificity in silico.
- Significant variability in assay reporting and specificity was observed across the reviewed literature.
Conclusions:
- Current DNA-based assays for fish authentication often lack sufficient species specificity, compromising reliability.
- There is an urgent need for standardized reporting of DNA-based assays to ensure reproducibility and accuracy in seafood authentication.
- Future assay development should consider factors like cost, sensitivity, DNA quality, and target species for improved performance.
