Regulation of Gene Expression

 Both prokaryotes and eukaryotes alter their patterns of gene expression in response to changes in environmental conditions.  In multicellular eukaryotes, each cell type contains the same genome but expresses a different subset of genes.  During development, gene expression must be carefully regulated to ensure that the right genes are expressed only at the correct time and in the correct place.  Gene expression in eukaryotes and bacteria is often regulated at the transcription stage. ○ Control of other levels of gene expression is also important.  RNA molecules play many roles in regulating eukaryotic gene expressions.  Disruptions in gene regulation can lead to cancer.