One often thinks of bacteria and multicellular organisms as simple but even the most simple bacterium and organism have the most complex task when it comes to gene regulation. Bacteria in your gut or organisms in general carry around thousands of different types of genes. These genes most likely encode proteins, each of which has its own role in a process to defend against viruses, maintain cell structure, and fuel metabolism. Some of the proteins are needed routinely while there are others that are only needed under certain circumstances. Because of this, cells do not always express themselves. They only express themselves at times needed.
Individual Research Topic – Control of gene Expression
Prokaryotes, such as bacteria are very resourceful and active organisms. The amount of synthesis of protein in bacteria that differ more than a 1000-fold in the response to environmental challenges and amount of nutrients. Multicellular organism (eukaryotic) cells respond to many different varying conditions. When disclosed to hormones and expansion factors, these such cells will change considerably in many ways. For example, they would change in shape, growth, and other characteristics. In addition, there are many other cell types present in multicellular organisms. For Instance, muscle and nerve cells show considerably different morphologies and have many other properties that are different, however they share the same DNA. There are some genes that are expressed all of the time, these are the genes are subject to constitutive expression. However, there are many genes that are not expressed at all times and are only expressed for certain situations. Especially for specific cells or under a particular condition. All of the genes that are not expressed all of the time are subjected to regulated expression. Having the differing properties is the reason for the differences in gene expression. There are some genes that are expressed all of the time, these are the genes are subject to constitutive expression. However, there are many genes that are not expressed at all times and are only expressed for certain situations. Especially for specific cells or under a particular condition. All of the genes that are not expressed all of the time are subjected to regulated expression. Gene expression is defined as the combination of the transcription of a gene into messenger RNA, how that process works and then the translation into mRNA. The question on how gene expression is controlled is a complex thing to learn. For instance, gene activity is always controlled at the level of transcription, first. Most of the control is accomplished through the exchange of the proteins that bind to specific DNA and DNA-binding sites. Gene regulated is controlled by regulatory sites that can be closed or far away to the region of DNA that is be transcribed. Regulatory proteins recruit RNA Polymerase to sites within the genome. This happens in both prokaryotes and eukaryotes. In Eukaryotes, gene regulation is a lot more complicated. This happens because the genome in eukaryotes is larger and encodes a lot more complexly. There are also many different types of cells in eukaryotes, such as a liver cells, pancreatic cells, and etc. The genes that are highly specialized cells have a large difference in expression. It is also complex because the genes that encode proteins are usually enormously large. The last reason is that the transcription and translation are not coupled and that negates some of the gene regulation mechanisms that prokaryotes utilize.
To be able to lie. Cells are required to respond to the changes that are happening in their environment. In this, regulation of the two man steps – transcription and translation – is critical to adaptability that is required. Cells can obviously control which genes get transcribed and which transcripts are translated. Furthermore, cells can biochemically process the transcripts and proteins in order to affect their activity. This regulation happens in both eukaryotes and prokaryotes but as said before, it is more complex in eukaryotes.