How your environment talks to your genes without changing your DNA
In short: This educational sketch explores how epigenetics acts as a bridge between our genetic code and our lifestyle. It explains why two people with the same DNA can have different health outcomes based on external influences.
Epigenetics refers to chemical modifications that regulate gene expression—turning genes 'on' or 'off'—without altering the underlying DNA sequence. While your genome is the blueprint, the epigenome determines how those instructions are read. These changes can be transient and reversible, allowing cells to adapt to environmental factors like diet and behavior.
Key mechanisms include DNA methylation, where methyl groups attach to genes to silence them (such as during X-chromosome inactivation in females), and chromatin remodeling, which adjusts how tightly DNA is packaged to control access for transcription factors. These processes are significant in clinical contexts, particularly in understanding development and identifying molecular markers for diseases like cancer.
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Sources
- Summary by Intellect · source: Epigenetics - An Introduction
- Also: Epigenetics — Knowledge Hub
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