How has genetic engineering been used to produce human insulin and hepatitis B vaccine?

Genetic engineering utilizes recombinant DNA technology to transform microorganisms into biological factories for the production of essential medical proteins. This process involves the artificial manipulation and recombination of DNA to direct cells to synthesize specific substances.123

Human Insulin

The production of synthetic human insulin was a landmark achievement in biochemical engineering. Because the amino acid sequence of human insulin was known, scientists synthesized the corresponding DNA sequence in the laboratory. This genetic material was then incorporated into a laboratory strain of the bacterium Escherichia coli. These engineered bacteria were then used to manufacture insulin on a commercial scale, providing a reliable alternative to previously used animal-derived insulin.4

Hepatitis B Vaccine

Similarly, recombinant DNA technology is used to produce the hepatitis B vaccine. In this process, specific genes are introduced into host cells—such as yeast—which then express the viral protein required to stimulate an immune response. This method allows for the safe, large-scale production of vaccine components without the need to cultivate the actual virus.2351