One of the most studied epigenetic mechanisms is DNA methylation. In DNA methylation, a methyl group is added to cytosine bases at the sequence CG dinucleotide in a gene's promoter region. This methylation blocks the binding of transcription factors required for gene expression and results in gene silencing. Another important epigenetic mark is histone modifications. Histone proteins package DNA into structural units called nucleosomes. Histone tails can be modified by methylation, acetylation, phosphorylation and ubiquitination. These histone modifications influence the accessibility of DNA to the transcription machinery and thereby regulate gene expression. Both DNA methylation and histone modifications together modulate chromatin structure and control gene expression patterns in a cell-type and context-dependent manner.

Epigenetic Regulation During Development

Epigenetics Drugs and Diagnostic Technologies modifications play a key role in cellular differentiation during embryonic development. As a fertilized egg develops into a multi-cellular organism with diverse cell types, cells acquire distinctive epigenetic marks that lock their gene expression patterns and cellular identities.



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