Collaborative exercise: analysis of age estimation using a QIAGEN protocol and the PyroMark Q48 platform

Area of Science:

• Forensic genetics
• Molecular biology
• Epigenetics

Background:

• Human age estimation from trace evidence is crucial for criminal investigations.
• DNA methylation patterns are a promising biomarker for chronological age determination.
• Standardization of forensic age estimation methods is essential for reliable results.

Purpose of the Study:

• To evaluate the performance of a QIAGEN age estimation protocol across multiple forensic genetic laboratories.
• To assess the reliability and accuracy of DNA methylation-based age prediction in forensic casework.
• To validate a specific assay targeting five CpG loci for human age estimation.

Main Methods:

• DNA methylation analysis using a QIAGEN protocol involving bisulfite treatment and PyroMark Q48 sequencing.
• Amplification and sequencing of five specific CpG loci (ELOVL2, C1orf132, TRIM59, KLF14, FHL2).
• Analysis of blood samples from 49 individuals (18-64 years) with controls by five independent laboratories.

Main Results:

• The QIAGEN age estimation protocol was successfully tested by five forensic laboratories.
• An existing age estimation model applied to the data yielded a mean absolute deviation of 3.62 years.
• The study demonstrated the feasibility of using DNA methylation for age estimation in a forensic context.

Conclusions:

• The QIAGEN age estimation protocol is a reliable method for forensic genetic laboratories.
• DNA methylation analysis provides a valuable tool for estimating perpetrator age in criminal investigations.
• The validated protocol shows potential for routine application in forensic casework.