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Non-invasive age estimation based on faecal DNA using methylation-sensitive high-resolution melting for Indo-Pacific
Genfu Yagi1, Huiyuan Qi2, Kana Arai2
1Graduate School of Bioresources, Mie University, Tsu, Mie, Japan.
Molecular Ecology Resources
|December 2, 2023
Summary
Scientists developed a non-invasive method to estimate the age of Indo-Pacific bottlenose dolphins using DNA methylation in fecal samples. This breakthrough offers a less invasive alternative to traditional methods for wildlife age assessment.
Area of Science:
- Marine Biology
- Wildlife Ecology
- Genetics
Background:
- Accurate age estimation is crucial for understanding wild animal life history.
- Traditional odontocete age estimation involves invasive dental growth layer group (GLG) analysis.
- DNA-based methods are emerging as less invasive alternatives, with potential for fecal sample application.
Purpose of the Study:
- To develop a non-invasive DNA-based age estimation method for Indo-Pacific bottlenose dolphins.
- To validate the use of fecal samples for epigenetic age prediction in marine mammals.
- To establish an accurate age estimation model for ecological studies.
Main Methods:
- Collected fecal samples from wild Indo-Pacific bottlenose dolphins (Tursiops aduncus).
- Analyzed DNA methylation rates in GRIA2 and CDKN2A gene regions using methylation-sensitive high-resolution melting (MS-HRM).
- Developed an age estimation model based on methylation rates, validated with known ages from longitudinal surveys.
Main Results:
- Significant correlations were found between age and methylation rates in both GRIA2 and CDKN2A.
- The developed age estimation model demonstrated sufficient accuracy (MAE = 5.08, R² = 0.33) for ecological studies.
- This study represents the first successful application of non-invasive fecal samples for marine mammal age estimation.
Conclusions:
- Epigenetic markers in fecal DNA provide a viable, non-invasive method for aging Indo-Pacific bottlenose dolphins.
- This technique significantly reduces the need for invasive procedures in marine mammal research.
- The developed model supports long-term ecological monitoring and life history studies of this species.
