Summary of "Biotechnology and its Applications (Part 01) - Simplified | Drishti IAS English"

Summary of "Biotechnology and its Applications (Part 01) - Simplified | Drishti IAS English"

Main Ideas and Concepts:

  1. Introduction to Biotechnology
    • Biotechnology involves using biological systems or living organisms to develop technological advances.
    • Genetic engineering, developed in the 1970s, accelerated biotechnology research by enabling modification of organisms' DNA.
    • Biotechnology is used for industrial-scale production of biopharmaceuticals and biological products using genetically modified microbes, fungi, plants, and animals.
  2. Important Genetic Terms
    • Gene: Basic unit of inheritance; a DNA segment controlling traits passed from parents.
    • Genome: Complete set of genes/genetic material in a cell or organism; like a recipe book for growth and development.
    • Genome Organization: Linear order of DNA elements divided into chromosomes; also refers to 3D chromosome structure and DNA positioning in the nucleus.
    • Gene Editing: Technique to make precise changes in DNA sequences using tools like CRISPR-Cas9, which uses engineered nucleases to cut DNA at specific sites.
    • Genome Sequencing: Reading the order of nucleotide bases (A, T, C, G) in DNA or RNA to interpret genetic information. Human genome has over 3 billion bases.
    • Viruses may have DNA or RNA genomes (e.g., coronavirus has RNA).
  3. Applications of Biotechnology
    • Agriculture
      • Genetically Modified (GM) crops as alternatives to conventional farming to increase yield and reduce chemical use.
      • GMOs (plants, bacteria, fungi, animals) have altered genes for beneficial traits.
      • Benefits include:
        • Tolerance to abiotic stresses (salt, heat).
        • Pest resistance reducing pesticide use.
        • Improved nutrient use efficiency preventing soil fertility loss.
        • Enhanced nutritional value (e.g., Golden Rice enriched with Vitamin A).
    • Genetically Modified Bio-pesticides
      • Bt toxin from Bacillus thuringiensis (Bt) bacteria cloned into plants to provide insect resistance.
      • Bt crops include cotton, corn, rice, tomato, potato, soybean.
      • Bt produces proteins toxic to specific insect pests, reducing chemical insecticide use.
    • Pest Resistant Plants
      • RNA interference (RNAi) used to combat nematode infestations in plants.
      • RNAi silences specific mRNA to prevent translation, acting as a cellular defense mechanism.
    • Medicine
      • Recombinant DNA technology allows mass production of safe, effective therapeutic drugs with fewer immunological reactions.
      • Genetically Engineered Insulin:
        • Insulin composed of two polypeptide chains linked by disulfide bridges.
        • DNA technology helps produce mature, functional insulin for diabetes management.
      • Gene Therapy:
        • Corrects hereditary diseases by inserting functional genes into patient cells.
        • Example: Treatment of Adenosine Deaminase (ADA) deficiency, an immune system disorder.
        • Gene-corrected lymphocytes are cultured and reintroduced to patients.
        • Potential for permanent cures if gene introduced at embryonic stages.
    • Molecular Diagnosis
      • Early disease diagnosis is crucial for effective treatment.
      • Techniques include:
      • PCR used for HIV detection and identifying genetic mutations in cancer and other disorders.
    • CRISPR Technology
      • A genome editing tool adapted from bacterial immune defense.
      • Allows precise DNA sequence alteration and gene function modification.
      • Used in research on diseases like cystic fibrosis, hemophilia, and sickle cell disease.

Detailed Bullet Point Summary of Methodologies and Applications:

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