Bacterial Transformation Mechanism | Step-by-Step Animation

Previous Video :    • Horizontal Gene Transfer   There are two major forms: A. Natural Transformation Some bacteria naturally develop competence—the ability to take up DNA. Steps: Competence development → special proteins (competence factors) prepare the cell. DNA binding → extracellular DNA binds to receptors on the bacterial surface. DNA uptake → one strand of the DNA enters, the other is degraded. Integration → the incoming DNA integrates into the host genome by homologous recombination. Examples: Streptococcus pneumoniae, Bacillus subtilis, Neisseria gonorrhoeae, Haemophilus influenzae. B. Artificial (Induced) Transformation In labs, bacteria like E. coli are made competent artificially to insert plasmids: Chemical method → CaCl₂ treatment followed by heat-shock makes membranes permeable. Electroporation → high-voltage pulses create temporary pores for DNA entry. This is the basis of genetic engineering and recombinant DNA technology. 🔹 4. Significance of Transformation Genetic diversity → helps bacteria adapt and survive in changing environments. Antibiotic resistance → resistant genes can spread among bacterial populations. Virulence → pathogenic bacteria may acquire new traits. Biotechnology → transformation is used for cloning, recombinant protein production (e.g., insulin), and gene manipulation. 🔹 5. Applications in Science & Medicine Production of genetically engineered bacteria. Creation of insulin, growth hormones, and vaccines. Study of gene function by inserting reporter genes. Development of GM crops in agriculture.