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How can cells with the same DNA become specialized into different cell types?
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human development
Growth of the human fetus from the fourth month to the ninth month of pregnancy.
Cells with the same DNA become specialized through a process called cell differentiation. Rather than losing or destroying genes, cells regulate which genes are expressed and the level to which they are expressed.1
This specialization is driven by several key mechanisms:
- Transcriptional Control: The most influential factor is the regulation of gene transcription. Transcription factors bind to regulatory sequences in the DNA to activate or inhibit the synthesis of specific proteins.1
- Epigenetic Modifications: Chemical modifications to DNA and histones—such as methylation—alter the structure of chromatin. This determines whether a gene is accessible for expression or remains silenced.12
- Cell Signaling: During development, cells receive signals from their environment, such as growth factors or interactions with neighboring cells. Mechanisms like cytoplasmic localization and lateral inhibition amplify small initial differences between cells, committing them to specific pathways.34
Once a cell is differentiated, these states are generally stable and persistent, ensuring that specialized cells maintain their unique structure and function throughout their lifetime.13