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DNA-based Fish Species Identification Protocol
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Species Identification of Caviar Based on Multiple DNA Barcoding.

Qingqing Hu1, Yingqiu Pan2, Huili Xia2

  • 1College of Life Sciences, China Jiliang University, Hangzhou 310018, China.

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|July 14, 2023
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Summary

DNA barcoding effectively identifies caviar

Keywords:
COI geneD-loop geneDNA barcodingauthenticity identificationcaviarspecies identification

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Area of Science:

  • Molecular Biology
  • Food Authenticity
  • Marine Biology

Background:

  • Caviar authenticity is crucial for consumer trust and market integrity.
  • DNA barcoding offers a molecular tool for species identification.
  • Assessing caviar authenticity in the Chinese market is essential.

Purpose of the Study:

  • To evaluate DNA barcoding's effectiveness in verifying caviar origin.
  • To identify maternal species of caviar samples using genetic markers.
  • To detect mislabeling and adulteration in the Chinese caviar market.

Main Methods:

  • DNA extraction from 21 caviar batches.
  • Polymerase Chain Reaction (PCR) using universal and designed primers.
  • Sequencing and analysis of mitochondrial DNA genes (COI and D-loop).
  • Phylogenetic analysis using neighbor-joining dendrogram.

Main Results:

  • PCR products showed >98% similarity to database sequences.
  • The D-loop gene improved accuracy for interspecific sturgeon identification compared to the COI gene.
  • All samples were identified as sturgeon species, but 33.4% showed mislabeling.
  • Counterfeit caviar from non-sturgeon sources was excluded.

Conclusions:

  • DNA barcoding, particularly using the D-loop gene, is applicable for caviar authentication.
  • Significant mislabeling rates highlight illegal practices in the caviar market.
  • While effective for species identification, limitations exist for hybrid sturgeon detection.