Epigenetics of complex diseases: from general theory to laboratory experiments

Area of Science:

• Genetics
• Epigenetics
• Disease Mechanisms

Background:

• Complex non-Mendelian diseases present significant challenges in understanding their causes and mechanisms.
• Traditional genetic and environmental studies often yield inconsistent or controversial data.
• Existing paradigms struggle to explain various disease irregularities like sporadic/familial cases and twin discordance.

Purpose of the Study:

• To present a new interpretation of "genes plus environment" by emphasizing epigenetic misregulation as a key etiopathogenic factor.
• To explore how epigenetic mechanisms explain non-Mendelian disease characteristics.
• To highlight the potential of epigenetic strategies in advancing complex disease research.

Main Methods:

• Review of existing literature on complex diseases, genetics, and epigenetics.
• Conceptual framework shifting focus to epigenetic misregulation.
• Discussion of laboratory methods for DNA methylation analysis, particularly epigenetic microarray technologies.

Main Results:

• Epigenetic misregulation is proposed as a major factor in complex non-Mendelian diseases.
• Epigenetic mechanisms align with observed disease irregularities (e.g., twin discordance, late onset).
• Stochastic epigenetic events may account for a significant portion of phenotypic variance attributed to environmental effects.

Conclusions:

• Integrating epigenetic strategies with traditional genetic approaches can significantly advance the discovery of complex disease mechanisms.
• Epigenetic microarray technologies show promise for advancing epigenetic analyses in complex diseases.
• A paradigm shift towards epigenetics is crucial for a comprehensive understanding of complex diseases.