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DNA Recovery from Forensically Relevant Blow Fly Larvae (Insecta, Diptera, Calliphoridae) Kept in Different
José Lucas Dias-Silva1, Orianna Tamara2, Andrés F Maya-Duque2
1Lab of Integrative Entomology, Dept of Animal Biology, IB, Universidade de Campinas (UNICAMP), Campinas, São Paulo State, Brazil. dias.silva.jlucas@gmail.com.
Neotropical Entomology
|February 19, 2026
Summary
Ethanol solutions (70-99.3%) effectively preserve mitochondrial DNA from forensically important fly larvae for up to 28 days, ensuring high recovery and amplification rates for taxonomic identification.
Area of Science:
- Forensic entomology
- Molecular biology
- Genetics
Background:
- Accurate DNA recovery from insect evidence is crucial for forensic investigations.
- Preservative solutions impact DNA integrity and subsequent analysis.
- Gaps exist in understanding optimal preservation methods for forensic insect DNA.
Purpose of the Study:
- To evaluate DNA recovery and amplification rates from Chrysomya megacephala larvae preserved in common forensic solutions.
- To determine the efficacy of different ethanol concentrations and storage durations on DNA quality.
Main Methods:
- Larvae were preserved in various solutions for up to 47 days.
- DNA was extracted and quantified.
- Mitochondrial DNA amplification success rates were assessed.
Main Results:
- High DNA yields and amplification rates (90-95%) were achieved with 70% and 99.3% ethanol up to 28 days.
- DNA yield and amplification decreased significantly at 47 days.
- Kahle's solution showed no DNA amplification.
Conclusions:
- Ethanol (70-99.3%) is the most effective preservative for forensically important larvae DNA up to 28 days.
- Longer preservation intervals (47 days) compromise DNA integrity and usability.
- Optimal preservation protocols are essential for reliable forensic insect identification.
