DNA METHYLATION AGE ESTIMATION IN FORENSIC SCIENCE

Shivi Forensics
DNA METHYLATION AGE ESTIMATION IN FORENSIC SCIENCE

Written By:
Ms. Raksha R.K
Member, Shivi Forensics 


INTRODUCTION
DNA methylation age estimation is an emerging technique in forensic science used to predict the age of an individual from biological evidence. It is based on epigenetic modifications, specifically DNA methylation, where a methyl group is added to cytosine bases in DNA. These methylation patterns change systematically with age.
Unlike traditional DNA profiling, which identifies an individual, this method helps determine the biological age of a person. This is especially useful in criminal investigations when only biological traces such as blood, saliva, or skin cells are available.

HISTORY AND DEVELOPMENT
• Early 2000s: Scientists identified links between DNA methylation and aging
• 2011: Age prediction models using CpG sites were introduced
• 2013: Epigenetic clock improved prediction accuracy
• Present: Models estimate age with ±3–5 years accuracy

KEY PRINCIPLE: DNA METHYLATION
DNA methylation occurs mainly at CpG sites. Over time:
• Some sites gain methylation
• Others lose methylation
These predictable changes act as a biological clock, allowing age estimation based on methylation patterns.

METHODOLOGY OVERVIEW
• DNA extraction from biological samples
• Chemical treatment to detect methylation
• Analysis of CpG markers
• Use of statistical or machine-learning models

APPLICATIONS IN FORENSICS
• Estimating age of unknown suspects
• Disaster victim identification
• Missing persons investigations
• Cold case analysis

ADVANTAGES
• Works with small or degraded samples
• Provides additional biological information
• Applicable across different tissues
• Improving accuracy with modern technology

CASE STUDY
In a criminal investigation handled by the forensic science team in Central Europe, biological evidence (saliva) was recovered from a crime scene, but no match was found in existing DNA databases. Forensic scientists analyzed the sample to estimate the biological age of the individual.
The results indicated that the suspect belonged to a specific age range. Based on this information, investigators narrowed down potential suspects and focused their search accordingly. This contributed to identifying the individual and advancing the case.

CONCLUSION
DNA methylation age estimation is a powerful and evolving tool in forensic science. By analyzing age-related epigenetic changes, it provides valuable insights into unknown individuals. As research advances, it is becoming an important complement to traditional DNA profiling, improving the ability to solve complex investigations.

FIGURE :1


FIGURE :2 PROCESS

 REFERENCES
• Epigenetics - Allis, C. D., Jenuwein, T., Reinberg, D., & Caparros, M. L. (2015). Epigenetics (2nd ed.). Cold Spring Harbor Laboratory Press.
• DNA methylation age of human tissues and cell types - Horvath, S. (2013). DNA methylation age of human tissues and cell types. Genome Biology, 14(10), R115.
• Age prediction using DNA methylation analysis -Zbieć-Piekarska, R., et al. (2015). Age prediction using DNA methylation analysis. Forensic Science International: Genetics, 17, 173–179.

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