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Methylation-Based Age Estimation Model Construction and Its Effectiveness Evaluation
S F Li1,2, F D Peng3, J N Wang4
1School of Forensic Medicine, Shanxi Medical University, Taiyuan 030001, China.
Fa Yi Xue Za Zhi
|March 22, 2019
Summary
This study identified eight age-related DNA methylation loci in Han males from northern China. A developed epigenetic clock model accurately estimates chronological age, aiding forensic investigations.
Area of Science:
- Forensic Science
- Genetics
- Epigenetics
Background:
- Accurate age estimation is crucial in forensic science.
- DNA methylation patterns exhibit age-related changes.
- Previous age estimation models have limitations in specific populations.
Purpose of the Study:
- To identify DNA methylation loci associated with age in Han males from northern China.
- To develop and validate an epigenetic model for age estimation in this demographic.
Main Methods:
- Screened 21 candidate DNA methylation loci.
- Analyzed methylation levels in 476 blood samples using EpiTYPER.
- Selected 8 age-related loci for model construction.
Main Results:
- Developed a multivariate linear regression model (R²=0.93) with a Mean Absolute Deviation (MAD) of 2.69 years.
- Validated the model on independent samples, achieving MADs between 3.80 and 4.68 years.
- Identified specific CpG sites on genes including TRIM59, RASSF5, Clorf132, CSNK1D, ELOVL2, and PDE4C.
Conclusions:
- The constructed age estimation model is effective for Han males in northern China.
- The model has practical applications in forensic investigations for estimating the age of victims and suspects.
- This epigenetic approach can help narrow down investigative scopes.
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