Master10
Science & Technology Module

Biotechnology & Genetic Engineering

Biotechnology applies cellular and biomolecular processes to develop agricultural, medical, and industrial solutions. Recombinant DNA technology, pioneered by Paul Berg, Herbert Boyer, and Stanley Cohen in the 1970s, enabled the insertion of foreign genetic material into host plasmids to manufacture human insulin. In 2012, Emmanuelle Charpentier and Jennifer Doudna adapted the bacterial CRISPR-Cas9 immune mechanism into a revolutionary precision genome-editing tool, winning the 2020 Nobel Prize in Chemistry. India's Department of Biotechnology (DBT), established in 1986 under the Ministry of Science and Technology, oversees national biosafety protocols through the Genetic Engineering Appraisal Committee (GEAC) under the Environment (Protection) Act of 1986.

Key Concepts & Examination Highlights

  • Emmanuelle Charpentier and Jennifer Doudna received the 2020 Nobel Prize in Chemistry for developing the CRISPR-Cas9 genome editing technology.
  • The Genetic Engineering Appraisal Committee (GEAC) under the Ministry of Environment is the apex statutory body regulating GMOs in India.
  • Recombinant human insulin (Humulin), synthesized using genetically engineered E. coli bacteria, was first approved for commercial use in 1982.
  • Restriction endonucleases, often called molecular scissors, cut DNA molecules at specific palindromic recognition sequences, enabling the insertion of foreign genes into cloning vectors.
  • DNA ligase acts as molecular glue, catalyzing the formation of phosphodiester bonds to join fragmented DNA strands during recombinant DNA construction.
  • Polymerase Chain Reaction (PCR), invented by Kary Mullis in 1983, utilizes heat-stable Taq polymerase from Thermus aquaticus to amplify specific DNA sequences exponentially across thermal cycles.
  • Bt cotton is the only genetically modified crop approved for commercial cultivation in India, engineered with genes from the soil bacterium Bacillus thuringiensis to produce endotoxins toxic to bollworms.
  • Gel electrophoresis separates DNA, RNA, or protein fragments according to molecular size and charge through an agarose or polyacrylamide matrix under an electric field.
  • The Human Genome Project (HGP), completed in 2003, sequenced approximately 3 billion base pairs of the human euchromatic genome, identifying roughly 20,000–25,000 protein-coding genes.
  • Monoclonal antibodies are identical antibodies produced by hybridoma cells (fusions of B-lymphocytes and myeloma cells), developed by Georges Köhler and César Milstein in 1975.
  • DNA fingerprinting (profiling), developed by Sir Alec Jeffreys in 1984, analyzes Variable Number Tandem Repeats (VNTRs) or Short Tandem Repeats (STRs) for forensic identification and paternity testing.
  • Reverse transcription PCR (RT-PCR) converts viral RNA into complementary DNA (cDNA) using reverse transcriptase before amplification, serving as the gold standard diagnostic for RNA viruses like SARS-CoV-2.
  • Gel electrophoresis separates DNA, RNA, or protein fragments based on size and electric charge, utilizing agarose or polyacrylamide matrices under an applied electric field.
  • Southern blotting detects specific DNA sequences in DNA samples, whereas Northern blotting identifies specific RNA molecules and Western blotting detects target proteins using antibodies.
  • DNA ligase is an essential enzyme in molecular cloning that catalyzes the formation of phosphodiester bonds to join together Okazaki fragments or recombinant DNA strands.
  • Taq polymerase, an exceptionally heat-stable DNA polymerase isolated from the thermophilic bacterium Thermus aquaticus, enables automated thermal cycling in PCR.
  • Gene therapy involves introducing, removing, or altering genetic material within a patient's cells to treat genetic diseases, as seen in the first approved gene therapy for adenosine deaminase (ADA) deficiency in 1990.
  • Chimeric Antigen Receptor (CAR) T-cell therapy genetically engineers a patient's own T-lymphocytes to express synthetic receptors targeting specific tumor antigens such as CD19 in leukemia.
  • Induced pluripotent stem cells (iPSCs), developed by Shinya Yamanaka in 2006, are adult somatic cells reprogrammed into an embryonic-like pluripotent state using four transcription factors (Oct4, Sox2, Klf4, and c-Myc).
  • Gene knockdown via RNA interference (RNAi), discovered by Andrew Fire and Craig Mello in 1998, utilizes double-stranded RNA (dsRNA) and the Dicer-RISC pathway to selectively silence post-transcriptional gene expression.
  • The Department of Biotechnology (DBT), under India's Ministry of Science and Technology, was established in 1986 to oversee biosafety regulations, genetic research, and biotechnology industrial promotion.
  • The Genetic Engineering Appraisal Committee (GEAC), functioning under the Ministry of Environment, Forest and Climate Change (MoEFCC), is the statutory apex body in India for approving environmental release of GMOs.
  • DNA fingerprinting (DNA profiling), developed by Sir Alec Jeffreys in 1984, identifies individuals by analyzing polymorphic variable number tandem repeats (VNTRs) and short tandem repeats (STRs).
  • Plasmids used as cloning vectors typically contain three key features: an origin of replication (ori), a selectable marker (such as antibiotic resistance genes), and a multiple cloning site (MCS).
  • Synthetic biology combines molecular engineering and genomics to design synthetic organisms, exemplified by the creation of the first synthetic bacterial genome (Mycoplasma mycoides JCVI-syn1.0) by the J. Craig Venter Institute in 2010.
  • Base editing, pioneered by David Liu in 2016, enables the direct, irreversible chemical conversion of one target DNA base pair into another (such as C-G to T-A) without creating double-strand breaks.
  • Prime editing combines an engineered reverse transcriptase fused to a Cas9 nickase with a prime editing guide RNA (pegRNA) to write new genetic sequences directly into specified genomic sites.
  • Golden Rice is genetically engineered to biosynthesize beta-carotene (a precursor of Vitamin A) in the edible endosperm of rice, utilizing genes from daffodils (Narcissus pseudonarcissus) and the bacterium Erwinia uredovora.
  • Flavr Savr tomato was the first commercially grown genetically modified food crop approved by the US FDA in 1994, engineered with antisense RNA to suppress the polygalacturonase enzyme and delay rotting.
  • Dolly the sheep, born in July 1996 at the Roslin Institute in Scotland, was the first mammal cloned from an adult somatic cell using Somatic Cell Nuclear Transfer (SCNT).
  • Next-Generation Sequencing (NGS), also known as high-throughput sequencing, utilizes massively parallel sequencing technologies to sequence millions of DNA fragments simultaneously at low cost.
  • Sanger sequencing, developed by Frederick Sanger in 1977, uses chain-terminating dideoxynucleotides (ddNTPs) to determine the exact nucleotide sequence of DNA.
  • CRISPR-Cas12 and CRISPR-Cas13 systems possess collateral (non-specific) cleavage activity upon target activation, forming the basis of nucleic acid detection platforms like SHERLOCK and DETECTR.
  • Biofortification is the process of breeding agricultural crops to increase their nutritional value through conventional selective breeding or modern genetic modification.
  • Bt brinjal is a genetically modified eggplant engineered with the Cry1Ac gene from Bacillus thuringiensis to provide resistance against the fruit and shoot borer (Leucinodes orbonalis).
  • DMH-11 (Dhara Mustard Hybrid-11) is a genetically modified mustard hybrid developed by Delhi University using the barnase-barstar male sterility and fertility restorer system.
  • DNA microarrays (gene chips) consist of thousands of microscopic DNA probes fixed to a solid substrate to measure the simultaneous expression levels of thousands of genes.
  • Epigenetic modifications include cytosine methylation in CpG islands and post-translational histone modifications (acetylation, methylation, phosphorylation) that regulate chromatin accessibility.
  • RNA sequencing (RNA-Seq) uses next-generation sequencing to profile and quantify the entire transcriptome of a cell or tissue under specific biological conditions.
  • Single-cell RNA sequencing (scRNA-Seq) analyzes gene expression at individual cellular resolution, revealing cellular heterogeneity within complex tissues and tumors.
  • Cas9 endonuclease contains two catalytic nuclease domains: RuvC and HNH, which each cleave one strand of double-stranded DNA three base pairs upstream of the Protospacer Adjacent Motif (PAM).
  • The Protospacer Adjacent Motif (PAM) is a short specific DNA sequence (5'-NGG-3' for Streptococcus pyogenes Cas9) immediately following the target DNA sequence essential for Cas9 binding.
  • Biolistics (gene gun) is a physical gene transfer method that fires microscopic heavy metal particles (gold or tungsten) coated with recombinant plasmid DNA into plant cells.
  • Agrobacterium tumefaciens, a soil bacterium containing the Tumor-inducing (Ti) plasmid, is widely utilized as a natural genetic vector for transferring foreign T-DNA into plant genomes.
  • Bactofection is a method of gene delivery where genetically modified bacteria (such as attenuated Salmonella or Listeria) are used to transfer therapeutic genes directly into target mammalian cells.
  • Antisense oligonucleotide (ASO) therapy uses short synthetic single-stranded nucleic acids that bind complementary mRNA transcripts to alter splicing or trigger RNase H-mediated mRNA degradation.
  • Bioremediation uses microorganisms or their enzymes to clean up polluted environments, such as using oil-degrading Pseudomonas putida (Superbug, developed by Ananda Mohan Chakrabarty).
  • The Nagoya Protocol on Access to Genetic Resources and the Fair and Equitable Sharing of Benefits Arising from their Utilization is an international supplementary agreement to the Convention on Biological Diversity (CBD).
  • The Cartagena Protocol on Biosafety is an international treaty governing the movements of living modified organisms (LMOs) resulting from modern biotechnology from one country to another.
  • Xenotransplantation is the transplantation of living cells, tissues, or organs from non-human animal species (such as genetically modified pigs with knocked-out alpha-gal antigens) into human recipients.
Curriculum & Reference Sources: Department of Biotechnology (DBT India), Genetic Engineering Appraisal Committee (GEAC), World Health Organization

Sample Solved Questions & Concept Explanations

8 Verified Concept Questions
Q1.EASY

What technique in biotechnology involves editing DNA sequences to correct genetic mutations?

Q2.EASY

Which technique is used to amplify millions of copies of a specific DNA segment in molecular biology laboratories?

Q3.EASY

What is the first cloned mammal produced from an adult somatic cell by the Roslin Institute in 1996?

Q4.MEDIUM

Which bacterial adaptive immune system was repurposed by Jennifer Doudna and Emmanuelle Charpentier into a programmable gene-editing tool?

Q5.MEDIUM

In genetic biotechnology, what is 'Recombinant DNA' (rDNA)?

Q6.HARD

In genetic engineering, the 'Prime Editing' and 'Base Editing' precision technologies developed by David Liu's lab improve on traditional CRISPR by doing what?

Q7.EASY

The "CRISPR-Cas9" genetic technology, for which Emmanuelle Charpentier and Jennifer Doudna won the 2020 Nobel Prize in Chemistry, is used for what?

Q8.EASY

What was the name of the first mammal successfully cloned from an adult somatic cell by Ian Wilmut and Keith Campbell in 1996 in Scotland?