7 public questions tagged with this topic.
Microinjection involves delivering foreign genes into animal lls using fine glass needles under a microscope. This follows from NCERT principle where the relation explains the outcome clearly for students in simple steps.
Ref: NCERT Biology Textbook for Class XI and XII (Zoology section), Chapter: Biology - Zoology portion covering relevant system and function.
DNA vaccines deliver genetic instructions as circular plasmid DNA rather than protein antigen or RNA. Plasmid constructs typically contain bacterial origin pUC, antibiotic resistance for selection during manufacturing, and eukaryotic expression cassette comprising strong promoter cytomegalovirus CMV immediate early with intron A enhancing transcription, codon optimized antigen gene, polyadenylation signal bovine growth hormone BGH or SV40 preventing mRNA degradation. Plasmids produced in Escherichia coli fermentation high copy number, purified supercoiled isoform removing endotoxin via chromat
Ref: Wolff et al. Science 1990 DNA vaccines plasmid; Plotkin DNA vaccines; WHO DNA plasmid.
Endothelial cell central therapeutic target cardiovascular gene therapy because monolayer regulates vascular homeostasis via eNOS converting L-arginine to nitric oxide stimulating soluble guanylate cyclase raising cGMP relaxing smooth muscle, prostacyclin via COX2 inhibiting platelet aggregation, barrier integrity VE-cadherin junctions, leukocyte adhesion E-selectin VCAM1. Dysfunction oxidative stress uncoupling eNOS drives atherosclerosis hypertension ischemia. Ischemic peripheral artery disease refractory angina benefit proangiogenic factors VEGF-A165, FGF4, HGF, HIF1-alpha delivered AAV1 or
Ref: Circ Res Cardiovascular Gene Therapy Endothelial Targets 2022; NHLBI Vascular Gene Therapy Overview; Lodish Vascular Biology Endothelial Function Chap 22.
Electroporation applies brief high-intensity electric fields to transiently permeabilize lipid bilayer enabling direct cytosolic entry naked nucleic acids without chemical carriers. Square-wave pulses 100-1500 V/cm for microseconds to tens milliseconds generate transmembrane potential exceeding dielectric strength 0.2-1 V causing rearrangement lipids forming aqueous pores water intrusion between headgroups. Polyanionic DNA driven electrophoretically toward anode migrates through pores reaching cytoplasm within milliseconds before rapid resealing seconds mediated lateral diffusion and calcium-d
Ref: FDA Guidance Electroporation Devices 2021; Molecular Therapy Methods Electroporation Protocol; NCERT Biotechnology Ch 11 Electroporation Principles.
Non-viral delivery uses chemically defined materials condensing nucleic acids avoiding viral capsid immunity and packaging limits. Cationic liposomes DOTAP, DOTMA, helper DOPE facilitating hexagonal phase transition, and cholesterol stabilizing bilayer electrostatically interact with negatively charged phosphate backbone plasmid DNA or mRNA condensing into lipoplexes 100-300 nm diameter positive zeta potential promoting binding anionic proteoglycans initiating endocytosis via clathrin and caveolae. Modern LNPs employ ionizable lipids DLin-MC3-DMA neutral at physiological pH 7.4 minimizing toxi
Ref: Lodish Molecular Cell Biology Non-viral Vectors Chap 9; NIH Non-viral Gene Delivery Liposomes Review; Alberts Membrane Fusion Liposome Mechanism.
Microinjection involves delivering foreign genes into animal cells using fine glass needles under a_x000D_ microscope.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Ethical Issues - GEAC and Animal Ethics
Retrovirus is commonly used as a vector in gene therapy to transfer therapeutic genes into host cells.
Ref: NCERT Class 12 Biology Chapter 10: Biotechnology and its Applications Medical Applications - Gene Therapy - ADA SCID
