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Related Experiment Video

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Application of DNA Barcoding to Identify Medicinal Plants

Application of DNA Barcoding to Identify Medicinal Plants

Published on: November 1, 2024

Assessing DNA barcoding as a tool for species identification and data quality control.

Yong-Yi Shen¹, Xiao Chen, Robert W Murphy

¹School of Life Sciences, Xiamen University, Xiamen, People's Republic of China. shen_yongyi@yahoo.com.cn

|February 23, 2013

Summary

DNA barcoding effectively detects errors in GenBank sequence data, identifying misidentified species and contamination. This method confirms sequencing accuracy and highlights taxonomic issues across diverse species.

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Area of Science:

Genomics
Molecular Biology
Bioinformatics

Background:

GenBank submissions have rapidly increased, leading to a rise in erroneous sequence data.
Errors include misidentified species, sample mix-ups, and contamination, posing challenges for research and forensics.

Purpose of the Study:

To utilize DNA barcoding to detect erroneous sequences in GenBank.
To evaluate deep intraspecific and shallow interspecific divergences for identifying taxonomic problems and errors.
To test the utility of the mitochondrial DNA cytochrome b (Cytb) gene in turtles for error detection.

Main Methods:

DNA barcoding was employed using the mitochondrial cytochrome b (Cytb) gene in turtles.
Intraspecific and interspecific genetic divergences were analyzed.
The strategy was applied to 47,524 mammalian CoxI sequences.

Main Results:

Intraspecific variation was typically <2.0%, while interspecific divergence often exceeded 10.0%.
Overlapping variation percentages indicated misidentified species and outdated taxonomies.
Problematic sequences were identified in Cytb from Insectivora and Chiroptera, and in mammalian CoxI sequences.

Conclusions:

Erroneous sequences are prevalent in GenBank.
DNA barcoding is a reliable tool for confirming sequencing accuracy.
This method can uncover misidentified species, taxonomic inaccuracies, contamination, and sequencing errors.