1. Identify the Gene: Scientists isolate the specific gene responsible for producing the desired human protein.
2. Cloning: They make copies of the gene using techniques like PCR (polymerase chain reaction).
3. Vector Insertion: The gene is inserted into a circular piece of DNA called a plasmid. Plasmids are like tiny, self-replicating ferries that can carry the gene into a bacterium.
4. Transformation: The engineered plasmid is introduced into bacteria. Some bacteria will successfully take up the plasmid.
5. Expression: Once inside the bacterium, the human gene is transcribed and translated, just as it would be in a human cell. This leads to the production of the desired human protein.
6. Harvesting: The bacteria are then grown in large quantities, and the human protein is extracted and purified.
Why Bacteria are Useful:
* Easy to grow: Bacteria multiply rapidly and are relatively inexpensive to cultivate.
* Efficient protein production: Bacteria can produce large amounts of protein.
* Versatile: A wide variety of bacteria can be used to produce different human proteins.
Examples of Human Proteins Produced by Bacteria:
* Insulin for diabetes
* Human growth hormone for growth disorders
* Erythropoietin (EPO) for anemia
* Interferon for viral infections
Ethical Considerations:
While this technology is powerful, it's important to note that there are ethical considerations related to the production of human proteins in bacteria, such as the potential for contamination and the impact on the environment.
In summary, bacteria can be genetically engineered to produce human proteins because they can be easily manipulated to express foreign genes and synthesize the corresponding proteins. This technology has revolutionized medicine, providing us with a cost-effective and efficient way to produce essential human proteins.
