Unit 10 Introduction to Biotechnology Study Notes

Overview of Biotechnology

  • Definition: Biotechnology involves the use of living organisms, biological systems, or their derivatives to develop products and technologies that improve human life and health.

  • Conceptual Development: While biological processes have been harvested for over 10,000 years, the formal concept emerged in the 19th century through in vitro cell cultures.

Stages of Biotechnological Development

  • Ancient Biotechnology (8000–4000 BC): Focused on the domestication of animals (milk and meat) and the cultivation of food crops like rice, barley, and wheat.

  • Classical Biotechnology (2000 BC; 1800–1900 AD): Involved the use of microorganisms in fermentation for food (cheese, yogurt, bread, wine, beer) and medicine. Key developments include:

    • 1796: Edward Jenner demonstrated vaccination against smallpox.

    • 1880s: Louis Pasteur proposed the Germ theory and described fermentation scientific evidence.

    • 1919: Karl Ereky coined the term "Biotechnology."

    • 1929: Alexander Fleming discovered the antibiotic penicillin from Penicillium notatum.

  • Modern Biotechnology (1977–Present): Characterized by manipulation of genetic information via recombinant DNA (rDNA) technology.

    • 1953: Watson and Crick published the double-helix structure of DNA.

    • 1970: Discovery of restriction enzymes and the production of Insulin.

    • 1997: Cloned the sheep Dolly via nuclear transfer technology.

Categorization by Field and Color

  • Medical (Red): Diagnostics, therapeutics, vaccines, and genetic engineering for disease treatment.

  • Agricultural (Green): Developing Genetically Modified Organisms (GMOs) for stress tolerance and improved yield (e.g., Bt crops).

  • Industrial (White): Use of enzymes and biocatalysts for manufacturing chemicals, biofuels, detergents, and textiles.

  • Environmental (Grey): Bioremediation and waste treatment to reduce pollution.

  • Other Color Designations:

    • Gold: Bioinformatics and computational biology.

    • Yellow: Food production (fermentation).

    • Blue: Marine resource applications.

    • Violet: Law, ethics, and philosophy.

    • Dark: Bioterrorism and biological weapons.

Essential Techniques in Biotechnology

  • Genetic Engineering: Manipulating DNA by inserting foreign genes.

  • Cell and Tissue Culture: Growing cells or tissues in laboratory conditions on organized media.

  • RNA Interference (RNAi): Using small RNAs (typically lengths of < 30 bases) to regulate gene expression.

  • Bioinformatics: Computational analysis of biological data.

  • Genomics: Includes transcriptomics (microarray expression), proteomics (protein structures), and metabolomics (metabolite profiling).

  • Marker Assisted Selection (MAS): Using DNA markers (RFLP, RAPD, AFLP) linked to phenotypic traits to speed up crop breeding.

  • Cryopreservation: Long-term storage of biological material in liquid nitrogen at −196 ∘C-196\,^{\circ}\text{C}.

General Applications

  • Medicine: Production of human insulin, recombinant vaccines (Hepatitis B), gene therapy for hereditary diseases, and mRNA vaccines for COVID-19 (e.g., Pfizer-BioNTech and Moderna, with 90% efficacy).

  • Environment: Phytoremediation (using plants to remove pollutants) and the use of engineered microbes for waste management.

  • Industry: Production of biodegradable plastics (PHAs), oleochemicals from plant oils, and improved fabric finishing in textiles.

  • Agriculture: Development of "Golden Rice" enriched with β\beta-carotene (provitamin A) and ferritin (iron), as well as crops resistant to salinity, pests, and drought.

Specific Methods and Applications in Plant Biotechnology

  • Tissue Culture: Technique pioneered by Gautheret in 1939. Involves using an explant to form a callus (undifferentiated cell mass) or somatic embryos.

  • Gene Transfer:

    • Agrobacterium-mediated: Using Agrobacterium as a vector to infect plants.

    • Gene Gun: Firing DNA-coated tungsten particles into plant cells.

    • Direct Methods: Electroporation (using electrical pulses to create micropores) and chemical-mediated uptake (PEG).

  • Nanobiotechnology: Use of nanoparticles (Zinc oxide and Iron) as nanofertilizers and nanopesticides with superior anti-pathogenic qualities.

Questions & Discussion

Self-Assessment Questions 1

  • Q: Who coined the term ‘biotechnology’?

  • A: Karl Ereky in 1919.

  • Q: What is the ‘part’ of plant used for culture called?

  • A: Explants.

  • Q: Name the scientist who tried to cultivate isolated cells and root tips on an organized medium.

  • A: G. Haberlandt.

  • Q: Name the antibiotic produced by Alexander Fleming.

  • A: Penicillin.

  • Q: Name of the sheep cloned by researchers in Scotland.

  • A: Dolly.

  • Q: Name the technique used for computational analysis of biological data.

  • A: Bioinformatics.

Self-Assessment Questions 2

  • Q: Improvement of crops done via incorporation of desired agronomic traits is known as…?

  • A: Transformation.

  • Q: The plants formed after incorporation of genes for desired characters are called…?

  • A: Transgenic.

  • Q: Undifferentiated mass of cells produced via tissue culture is called…?

  • A: Callus.

  • Q: During the … phase of plant tissue culture, callus or embryos are transferred to growth regulators?

  • A: Multiplication.

  • Q: RAPD and AFLP are examples of…?

  • A: Genetic markers.