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Digital-Droplet PCR to Detect Indels Mutations in Genetically Modified Anopheline Mosquito Populations

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Codon changes challenge PCR-based gene doping detection.

Die Wu¹, Shengqian Ding^1,2,3, Nian Liu^1,2,3

¹Shanghai Anti-doping Laboratory, Shanghai University of Sport, Shanghai, PR China.

|October 7, 2025

Summary

This summary is machine-generated.

Gene doping detection using quantitative real-time PCR (qPCR) is challenged by codon changes. High-throughput sequencing offers a more robust method for detecting gene doping, even with modified targets.

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Area of Science:

Sports science
Molecular biology
Biotechnology

Background:

Gene doping, the non-therapeutic use of genes, is a growing concern in sports.
The World Anti-Doping Agency (WADA) prohibits gene doping and recommends quantitative real-time PCR (qPCR) for detection.
Current qPCR methods face limitations in detecting novel doping targets and are susceptible to alterations like codon changes.

Purpose of the Study:

To investigate the impact of codon changes on the detection efficiency of gene doping using qPCR.
To develop and validate standard materials for detecting genomic and transgenic human EPO (hEPO) gene doping.
To compare the efficacy of qPCR and Sanger sequencing in identifying gene doping, including codon-modified variants.

Main Methods:

Preparation of standard materials for genomic and transgenic hEPO genes.
Design and application of qPCR primers to assess detection of codon-changed transgenes.
Mimicking real-world gene doping scenarios by mixing wild-type and modified hEPO gene versions.
Method validation using Sanger sequencing to confirm gene doping detection.

Main Results:

Carefully designed qPCR assays can detect transgene signals, but codon changes significantly reduce detection efficiency.
qPCR successfully detected wild-type hEPO but failed to detect codon-changed transgenes in simulated doping scenarios.
Sanger sequencing effectively identified gene doping, even in the presence of codon changes.
Codon modifications pose a substantial challenge to current qPCR-based gene doping detection strategies.

Conclusions:

Codon changes in transgenes present a significant hurdle for qPCR-based gene doping detection.
The findings highlight the limitations of qPCR in the face of evolving gene doping techniques.
There is a critical need for the development and implementation of unbiased, high-throughput sequencing methods for comprehensive gene doping surveillance.