Applications and Risks of Genetic Engineering

A technique to cure genetic disorders by replacing a defective gene with a functional one.

Key Example: Treating Severe Combined Immunodeficiency (SCID) by extracting a patient's bone marrow stem cells, inserting a normal gene via a viral vector, and reinjecting them into the blood.

Laboratory cultures yield too little product for real-world use.

• Function: Large vessels (100–1000 litres) that biologically convert raw materials into specific products on an industrial scale.
• Mechanism: They maximise yield by providing strictly controlled, optimal growth conditions (temperature, pH, oxygen, and salts).
• Common Type: The stirring-type bioreactor is the industry standard.

• Health: Unknown long-term effects or allergies from consuming GM foods.
• Ecology: Unpredictable environmental damage if GM organisms mix with natural ecosystems.
• Ethics: Moral controversies surrounding the creation of new species and altering human genetics.

• Genetic engineering facilitates the study of gene structures and allows for the mass production of vital medical therapeutics, such as human insulin.
• Gene therapy directly treats inherited genetic disorders by replacing or complementing defective genes with functional ones.
• Genetically modified plants and animals are developed to enhance agricultural efficiency, improve nutritional value, and potentially reduce reliance on chemical fertilisers.
• Industrial-scale manufacturing of these biological products requires bioreactors, which provide strictly controlled, optimal environments for large cell cultures.
• The widespread use of genetic modification raises significant ethical, ecological, and health concerns that require careful ongoing evaluation.