⚙️ how
How are genes turned on and off in different cells?
Quick Answer
Cells control gene activity using regulatory DNA, transcription factors, and chemical tags on DNA and histones. This allows the same genome to produce different cell types.
The Full Story
A liver cell and a neuron contain almost the same DNA, but they use different sets of genes. Proteins called transcription factors bind to regulatory regions and help start or block transcription. Epigenetic marks, such as DNA methylation and histone modification, also influence whether DNA is accessible. This gene regulation is why identical DNA can produce such different tissues and organs.
Key Facts
1.Most human cells contain the same genome
2.DNA methylation can reduce gene activity
3.Transcription factors control when genes are expressed
YouTube Angle
Suggested video title for this topic:
"Same DNA, different cells: how your body chooses what to make"
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