Biotechnology 3 Unit 5 ReviewTechnical Skills in Biotechnology

Key Concepts and Terminology

• Biotechnology involves the application of biological processes, organisms, or systems to develop technologies and products
• Central dogma of molecular biology describes the flow of genetic information from DNA to RNA to proteins
• Recombinant DNA technology combines DNA molecules from different sources to create novel genetic sequences
  • Involves the use of restriction enzymes, DNA ligase, and plasmid vectors
• Polymerase Chain Reaction (PCR) amplifies specific DNA sequences using primers, DNA polymerase, and thermal cycling
• Genetic engineering introduces foreign DNA into an organism's genome to modify its characteristics or produce desired substances
• Bioreactors provide controlled environments for cell growth, product formation, and bioprocess optimization
• Monoclonal antibodies are highly specific antibodies produced by identical immune cells cloned from a single parent cell
• Biomarkers are measurable indicators of biological processes, pathogenic processes, or pharmacologic responses to therapeutic interventions

Laboratory Safety and Protocols

• Follow proper personal protective equipment (PPE) guidelines, including wearing lab coats, gloves, and safety glasses
• Use biosafety cabinets when working with biohazardous materials to prevent contamination and protect the user
• Properly label and store chemicals, reagents, and samples to avoid mix-ups and ensure safety
  • Use appropriate containers and storage conditions (temperature, humidity, light exposure)
• Maintain a clean and organized work environment to minimize the risk of accidents and contamination
• Properly dispose of biohazardous waste, such as contaminated materials, sharps, and chemicals, according to institutional guidelines
• Develop and follow standard operating procedures (SOPs) for consistent and reproducible results
• Regularly update and maintain laboratory notebooks to ensure accurate record-keeping and data integrity
• Attend safety training sessions and stay informed about the latest safety regulations and best practices

Essential Equipment and Techniques

• Micropipettes are used for precise liquid handling and sample transfer in microliter volumes
  • Proper pipetting techniques ensure accuracy and reproducibility
• Centrifuges separate particles based on size and density using centrifugal force
  • Different types of centrifuges are used for various applications (microcentrifuges, high-speed centrifuges, ultracentrifuges)
• Electrophoresis separates charged molecules, such as DNA, RNA, and proteins, based on their size and charge in an electric field
• Spectrophotometers measure the absorption of light by a sample at specific wavelengths to quantify concentration or purity
• Microscopes allow visualization of small structures and organisms
  • Light microscopes use visible light and lenses for magnification
  • Electron microscopes use electron beams for higher resolution imaging
• Chromatography techniques separate mixtures based on the differential partitioning of components between a stationary and mobile phase
• Aseptic technique prevents contamination of cell cultures and sterile materials by minimizing exposure to potential contaminants

DNA and Protein Analysis Methods

• DNA extraction isolates genomic DNA from cells or tissues using chemical and physical methods
  • Common methods include phenol-chloroform extraction and silica-based column purification
• Restriction fragment length polymorphism (RFLP) analysis detects variations in DNA sequences using restriction enzymes and gel electrophoresis
• DNA sequencing determines the precise order of nucleotides in a DNA molecule
  • Sanger sequencing uses dideoxynucleotide chain termination
  • Next-generation sequencing (NGS) technologies enable high-throughput, parallel sequencing
• Protein extraction isolates proteins from cells or tissues while preserving their native structure and function
• SDS-PAGE (sodium dodecyl sulfate-polyacrylamide gel electrophoresis) separates proteins based on their molecular weight
• Western blotting detects specific proteins using antibodies after transfer from an electrophoresis gel to a membrane
• Mass spectrometry identifies proteins and peptides based on their mass-to-charge ratio
• Enzyme-linked immunosorbent assay (ELISA) quantifies antigens or antibodies using enzyme-labeled antibodies and colorimetric detection

Cell Culture and Manipulation

• Maintain sterile conditions in cell culture to prevent contamination by microorganisms
  • Use aseptic technique, sterile reagents, and equipment
• Select appropriate cell culture media and supplements based on the specific requirements of the cell type
• Monitor cell growth and viability using microscopy, cell counting, and viability assays (trypan blue exclusion)
• Passage cells when they reach confluency to maintain optimal growth conditions and prevent overcrowding
• Cryopreservation allows long-term storage of cells using cryoprotectants (DMSO) and controlled freezing rates
• Transfection introduces foreign DNA into cells using chemical, physical, or viral methods
  • Common methods include lipofection, electroporation, and viral transduction
• Genome editing techniques, such as CRISPR-Cas9, allow precise modification of DNA sequences in living cells
• Flow cytometry analyzes and sorts cells based on their physical and fluorescent properties in a fluid stream

Bioinformatics Tools and Applications

• Sequence alignment tools (BLAST, ClustalW) compare DNA or protein sequences to identify similarities and evolutionary relationships
• Genome browsers (UCSC Genome Browser, Ensembl) provide interactive visualization and annotation of genomic data
• Gene expression databases (GEO, ArrayExpress) store and analyze transcriptomic data from microarray and RNA-seq experiments
• Protein structure databases (PDB) contain 3D structural information of proteins determined by X-ray crystallography, NMR, or cryo-EM
• Pathway analysis tools (KEGG, Reactome) help visualize and interpret biological pathways and networks
• Primer design software (Primer3, IDT OligoAnalyzer) aids in the design of PCR primers and probes
• Next-generation sequencing data analysis pipelines process raw sequencing data and perform tasks such as quality control, alignment, and variant calling
• Machine learning algorithms are increasingly used in biotech for data mining, pattern recognition, and predictive modeling

Emerging Technologies in Biotech

• Single-cell sequencing enables transcriptomic and genomic analysis at the individual cell level, revealing cellular heterogeneity
• Organoids are 3D cell culture models that mimic the structure and function of organs, providing more physiologically relevant systems for research and drug testing
• Synthetic biology involves the design and construction of novel biological systems or organisms with desired functions
  • Utilizes standardized genetic parts (BioBricks) and engineering principles
• Microfluidics manipulates and analyzes small volumes of fluids in microscale devices, enabling high-throughput screening and single-cell analysis
• Nanopore sequencing allows real-time, long-read sequencing of DNA or RNA molecules as they pass through a nanoscale pore
• CRISPR-based diagnostics (SHERLOCK, DETECTR) harness the specificity of CRISPR-Cas systems for rapid and sensitive detection of nucleic acids
• Optogenetics uses light to control the activity of genetically modified cells or organisms, enabling precise spatial and temporal manipulation
• Organ-on-a-chip devices integrate microfluidics, cell culture, and sensors to model organ functions and interactions for drug screening and disease modeling

Practical Applications and Case Studies

• Recombinant insulin production in bacteria revolutionized the treatment of diabetes
  • Human insulin gene is inserted into E. coli, which then produces large quantities of the protein
• Genetically modified crops (Bt corn, Roundup Ready soybeans) enhance agricultural productivity and reduce the use of pesticides
• Monoclonal antibodies are used for targeted cancer therapies (Herceptin for breast cancer, Rituximab for lymphoma)
• Gene therapy aims to treat genetic disorders by introducing functional copies of defective genes into patient cells
  • Successful examples include CAR T-cell therapy for leukemia and Luxturna for inherited retinal dystrophy
• Bioremediation employs microorganisms to degrade environmental pollutants and clean up contaminated sites
• Personalized medicine tailors treatments based on an individual's genetic profile, enabling more targeted and effective therapies
• Forensic DNA analysis helps identify suspects, victims, and biological relationships in criminal investigations and paternity cases
• Biofuel production uses engineered microorganisms to convert biomass into renewable fuels (ethanol, biodiesel)