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DNA Methylation: Bisulphite Modification and Analysis
Published on: October 21, 2011
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Differentiating between monozygotic twins through DNA methylation-specific high-resolution melt curve analysis
Leander Stewart1, Neil Evans1, Kimberley J Bexon1
1Forensic Biology Group, School of Applied Sciences, University of Huddersfield, Queensgate, Huddersfield, West Yorkshire HD1 3DH, UK.
Analytical Biochemistry
|February 14, 2015
Summary
High-resolution melt curve analysis can differentiate monozygotic (MZ) twins by detecting DNA methylation pattern differences. This method offers a faster, more accessible approach for forensic investigations where standard DNA profiling is insufficient.
Area of Science:
- Forensic Science
- Genetics
- Epigenetics
Background:
- Short tandem repeat (STR) profiling is standard for individual identification but fails to distinguish monozygotic (MZ) twins.
- DNA methylation patterns, influenced by environmental factors, diverge between MZ twins as they age, offering a potential differentiation marker.
- Current methods like whole genome sequencing and bisulfite pyrosequencing for methylation analysis are time-consuming and costly.
Purpose of the Study:
- To evaluate the efficacy of high-resolution melt curve analysis (HRM) as a method to differentiate MZ twins.
- To assess HRM's potential as a more accessible alternative to existing epigenetic analysis techniques.
Main Methods:
- Buccal swabs were collected from five sets of MZ twins.
- DNA underwent extraction, quantification, bisulfite treatment, and polymerase chain reaction (PCR) amplification.
- Targeted PCR products for Alu-E2F3 and Alu-SP markers were analyzed using high-resolution melt curve analysis.
Main Results:
- Significant differences in DNA methylation patterns were detected between MZ twins using HRM for the Alu-E2F3 marker in all five sets.
- The Alu-SP marker also showed significant differentiation in four out of five MZ twin sets.
- These findings indicate distinct epigenetic profiles detectable by HRM.
Conclusions:
- Bisulfite treatment combined with high-resolution melt curve analysis is a viable method for differentiating MZ twins.
- HRM offers a potentially faster and more cost-effective approach for epigenetic analysis in forensic contexts.
- This technique could enhance individual identification capabilities in cases involving MZ twins.
