Learning Objective: At the end of this lesson, the learner will be able to explain the principle and applications of molecular cloning and identify its use in producing recombinant proteins for therapeutic purposes.
Molecular cloning is a laboratory technique used to create recombinant DNA molecules and propagate them in a bacterial or eukaryotic host cell line. This allows researchers and clinicians to produce large quantities of specific proteins or study genes in a controlled environment.
Principle
- The gene of interest is inserted into a vector (plasmid, viral vector, or artificial chromosome).
- The recombinant vector is introduced into a host cell (bacteria or eukaryotic cell line).
- Host cells replicate, producing multiple copies of the recombinant DNA.
- Expression systems can be used to produce the corresponding protein product.
Applications
| Application | Example / Notes |
|---|---|
| Therapeutic protein production | Human insulin, human growth hormone, erythropoietin |
| Gene function studies | Expression or silencing of genes in model organisms |
| Vaccine development | Production of recombinant antigens |
| Genetic engineering | Creation of transgenic organisms or knockout models |
Clinical Relevance
- Recombinant insulin produced via E. coli or yeast is widely used in diabetes management.
- Human growth hormone production via recombinant cloning replaces the previously scarce pituitary-derived hormone.
- Cloning enables gene therapy research and the study of genetic diseases.
