The document summarizes various methods for transfecting animal cells, including calcium phosphate coprecipitation, lipofection, electroporation, viral vectors, microinjection, and direct DNA transfer. It provides details on the mechanisms and advantages/disadvantages of each method. Calcium phosphate transfection involves precipitating DNA with calcium phosphate to facilitate cell binding and entry. Lipofection uses cationic lipids to form complexes with nucleic acids for cellular uptake. Electroporation exposes cells to electric pulses to temporarily destabilize membranes and allow DNA entry. Viral vectors are highly efficient but require biosafety precautions. Microinjection and gene guns directly inject or bombard DNA into cells.
This document discusses various gene transfer techniques including physical, chemical, and biological methods. It focuses on biological methods such as bactofection and transduction using viruses. Bactofection involves using bacteria to deliver genes directly into cells, while transduction uses viruses to package and deliver genes. The document also discusses chemical methods like calcium phosphate and lipofection, as well as physical methods such as electroporation, microinjection, and particle bombardment to introduce DNA into host cells.
This document discusses various methods of transfection, which is the process of introducing nucleic acids into cells. It describes both physical and chemical transfection methods. Physical methods include electroporation, microinjection, and cell squeezing, which introduce DNA directly into cells using physical forces. Chemical methods involve using reagents like cationic lipids, calcium phosphate, and cationic polymers to form complexes with DNA that are then taken up by cells. The document discusses the principles, advantages, and disadvantages of many common transfection methods.
This document discusses various chemical agents and methods used for cell transformation through transfection of foreign DNA. It describes factors that affect transfection efficiency, including host cell health and culture conditions as well as DNA quality and quantity. Common transfection methods are also outlined, such as cationic lipids, calcium phosphate, DEAE-Dextran, and magnet-mediated transfection. Each method is briefly explained and its pros and cons discussed.
This document discusses various methods of transfection, which is defined as the introduction of foreign DNA into eukaryotic cells. It describes transfection methods such as calcium phosphate transfection, liposome-mediated transfection, retroviral transfection, and electroporation. It provides details on how each method works and compares their strengths and weaknesses. Common transfection methods like calcium phosphate and liposomes are simple but have low efficiency, while retroviral transfection can generate stable cell lines but has limitations on DNA size. Electroporation is fast and applicable to many cell types.
BOC Sciences is a life science group with its headquarter in New York. We are dedicated to providing the most complete in vivo and in vitro nucleic acid and protein transfection solutions to support gene and cell therapy, biologics production, and life science research.
Lipofection is a chemical transfection method that uses liposomes to introduce nucleic acids into cells. Liposomes are lipid vesicles that can fuse with cell membranes and release their contents. In lipofection, nucleic acids bind to cationic liposomes to form lipoplexes, which are taken up by cells via endocytosis. Once inside endosomes, the lipoplexes destabilize the endosomal membranes through their cationic properties, allowing the nucleic acids to enter the cytoplasm and be expressed. Calcium chloride transformation is a common method for transforming competent bacterial cells with plasmid DNA. It involves treating cells with calcium chloride to increase membrane permeability, then exposing the cells to plasmid DNA and subjecting them to a heat shock to facilitate
This document discusses non-viral gene transfer methods. It describes various techniques for direct delivery of naked DNA including electroporation, gene guns, sonoporation, magnetofection, hydrodynamic delivery, and microinjections. It also discusses various non-viral vectors for gene delivery including oligonucleotides, liposomes, lipoplexes, polymersomes, polyplexes, dendrimers, inorganic nanoparticles, and cell-penetrating peptides. Each method is described in terms of its mechanism of delivery, advantages, disadvantages and suitable target tissues. The document provides an overview of non-viral gene expression systems and delivery methods.
Hi, I am RAFi ,student of Genetic Engineering and Biotechnology , Jashore university of science & Technology. It is my first uploading slide in slideshare.I am so glad for doing this work.
This document discusses various gene transfer techniques including physical, chemical, and biological methods. It focuses on biological methods such as bactofection and transduction using viruses. Bactofection involves using bacteria to deliver genes directly into cells, while transduction uses viruses to package and deliver genes. The document also discusses chemical methods like calcium phosphate and lipofection, as well as physical methods such as electroporation, microinjection, and particle bombardment to introduce DNA into host cells.
This document discusses various methods of transfection, which is the process of introducing nucleic acids into cells. It describes both physical and chemical transfection methods. Physical methods include electroporation, microinjection, and cell squeezing, which introduce DNA directly into cells using physical forces. Chemical methods involve using reagents like cationic lipids, calcium phosphate, and cationic polymers to form complexes with DNA that are then taken up by cells. The document discusses the principles, advantages, and disadvantages of many common transfection methods.
This document discusses various chemical agents and methods used for cell transformation through transfection of foreign DNA. It describes factors that affect transfection efficiency, including host cell health and culture conditions as well as DNA quality and quantity. Common transfection methods are also outlined, such as cationic lipids, calcium phosphate, DEAE-Dextran, and magnet-mediated transfection. Each method is briefly explained and its pros and cons discussed.
This document discusses various methods of transfection, which is defined as the introduction of foreign DNA into eukaryotic cells. It describes transfection methods such as calcium phosphate transfection, liposome-mediated transfection, retroviral transfection, and electroporation. It provides details on how each method works and compares their strengths and weaknesses. Common transfection methods like calcium phosphate and liposomes are simple but have low efficiency, while retroviral transfection can generate stable cell lines but has limitations on DNA size. Electroporation is fast and applicable to many cell types.
BOC Sciences is a life science group with its headquarter in New York. We are dedicated to providing the most complete in vivo and in vitro nucleic acid and protein transfection solutions to support gene and cell therapy, biologics production, and life science research.
Lipofection is a chemical transfection method that uses liposomes to introduce nucleic acids into cells. Liposomes are lipid vesicles that can fuse with cell membranes and release their contents. In lipofection, nucleic acids bind to cationic liposomes to form lipoplexes, which are taken up by cells via endocytosis. Once inside endosomes, the lipoplexes destabilize the endosomal membranes through their cationic properties, allowing the nucleic acids to enter the cytoplasm and be expressed. Calcium chloride transformation is a common method for transforming competent bacterial cells with plasmid DNA. It involves treating cells with calcium chloride to increase membrane permeability, then exposing the cells to plasmid DNA and subjecting them to a heat shock to facilitate
This document discusses non-viral gene transfer methods. It describes various techniques for direct delivery of naked DNA including electroporation, gene guns, sonoporation, magnetofection, hydrodynamic delivery, and microinjections. It also discusses various non-viral vectors for gene delivery including oligonucleotides, liposomes, lipoplexes, polymersomes, polyplexes, dendrimers, inorganic nanoparticles, and cell-penetrating peptides. Each method is described in terms of its mechanism of delivery, advantages, disadvantages and suitable target tissues. The document provides an overview of non-viral gene expression systems and delivery methods.
Hi, I am RAFi ,student of Genetic Engineering and Biotechnology , Jashore university of science & Technology. It is my first uploading slide in slideshare.I am so glad for doing this work.
for cloning and expression of exogenous gene or gene throthrough vector it must be introduced into the host cell through transformation , ,transduction, electroporation gene gun etc.
This document discusses methods for transferring genes between organisms through chemical means. It describes calcium phosphate and lipid-mediated gene transfer, which are two common chemical methods. Calcium phosphate forms a precipitate that binds DNA and transfers it into cells, while lipid-mediated transfer uses liposomes to encapsulate DNA and fuse with cell membranes to deliver the DNA. Both methods can be used for transient or stable transfection but have limitations such as low efficiency. The document also provides details on the mechanisms, advantages, and applications of these chemical gene transfer methods.
This document discusses various techniques for introducing DNA into target organs, including chemical methods like DEAE-dextran and calcium-phosphate coprecipitation, physical methods like biolistic particle delivery and microinjection, and biological methods like Agrobacterium-mediated transformation. It provides details on the principles and advantages and disadvantages of each method.
DNA Transfection in Animal tissue culture and its methods.pptxMethusharma
You will learn the definition of DNA transfection in this presentation its examples, along with the procedures that are employed, through the use of organised flowcharts and diagrams. The Animal Biotechnology course, it is the first technique to learn.
This document summarizes non-viral gene transfer techniques. It discusses that gene expression is the process by which genetic information is used to produce functional products like proteins. Gene therapy techniques use genes to treat diseases by delivering transgenes into cells. Non-viral methods of gene transfer include chemical methods like oligonucleotides, liposomes, lipoplexes, and polymersomes, as well as physical methods like gene guns, electroporation, sonoporation, magnetofection, and hydrodynamic delivery. These non-viral methods facilitate intracellular delivery of DNA through mechanisms like forming transient pores in cell membranes.
This document provides an overview of protein expression in mammalian cells and protein purification techniques. It discusses how mammalian cells are the preferred system for producing mammalian proteins due to their ability to perform post-translational modifications. Common mammalian cell lines for expression include HEK293 and CHO cells. Plasmid vectors are typically used to insert the gene of interest, and transfection methods like lipofection and electroporation can be used to introduce the plasmid into cells. Affinity, size-exclusion, and ion-exchange chromatography are common protein purification techniques.
Gene cloning involves producing exact copies of a gene using genetic engineering techniques. It involves isolating the gene of interest from one organism and inserting it into a vector, which is then introduced into a host organism where the gene can be replicated. There are several methods used to transfer genes between organisms or cells, including bacterial transformation, electroporation, transfection, and microinjection. Bacterial transformation involves directly taking up exogenous DNA, electroporation uses an electric pulse to create pores for DNA entry, while transfection introduces nucleic acids into eukaryotic cells using chemical reagents or viruses.
Introduction and Description to Western Blotting, Steps involved in Western Blotting- Sample Preparation, Protein Gel Electrophoresis, SDS-PAGE, Protein Transfer, Electrophoretic Protein Transfer, Transfer Sandwich Diagram, Blocking, Antibody Probing and Detection, Applications of Western Blotting.
Gene transfer techniques can be used to treat diseases like diabetes. Viruses or vectors can be used to transfer genes like PDX-1 into mice pancreatic cells, causing them to produce insulin and regulating blood sugar. Different gene transfer methods include viral vectors, non-viral methods like microinjection, electroporation, and physical methods like gene guns. While promising, gene therapy faces challenges like low efficiency, safety concerns, and ethical issues that need to be addressed.
Protoplasts are the cells of which cell walls are removed and cytoplasmic membrane is the
outermost layer in such cells.Protoplast can be obtained by specific lytic enzymes to remove
cell wall.Protoplast fusion is a physical phenomenon,during fusion two or more protoplasts
come in contact and adhere with one another either spontaneously or in presence of fusion
inducing agents.
Microbial genetics involves the transmission of hereditary traits in microorganisms. It plays a role in developing fields like molecular and cell biology. Bacteria contain a single circular chromosome made of DNA that is compacted. Bacteria can also contain plasmids. DNA replication copies the parental DNA. Variability in microorganisms comes from changes in genotype and phenotype from factors like mutation and recombination. Mutation rates depend on type and can be increased by mutagens. Recombination involves processes like transformation, transduction, and conjugation. Plasmids can confer traits like antibiotic resistance and are transferred by conjugation. Gene expression in bacteria is regulated through mechanisms like induction and repression that control operons.
This document describes various methods for transferring genes into organisms. Biological methods include using viruses like cauliflower mosaic virus (CaMV) to transfer genes into plants. Physical methods include electroporation, which uses electric pulses to create pores in cell membranes through which DNA can enter. Liposomes and direct methods like microinjection and particle bombardment can also be used to directly transfer DNA. Chemical methods involve using compounds like polyethylene glycol (PEG) to destabilize cell membranes and allow DNA uptake. While physical methods can target single cells, they may damage cells. Biological methods using vectors are often more efficient but less controlled. Overall the document provides an overview of the key gene transfer techniques.
This document provides an overview of various gene transformation techniques, including both vector-mediated and direct methods. It discusses natural transformation mechanisms like conjugation and transduction, as well as artificial vector-mediated techniques like Agrobacterium-mediated transformation. Direct methods like microinjection, electroporation, particle bombardment, and chemical methods using PEG or calcium phosphate are also covered. The applications, advantages, and limitations of different techniques are summarized. Overall, the document serves as an informative introduction to the key gene transfer methods used in plant biotechnology.
This document provides an overview of various gene transformation techniques, including both vector-mediated and direct methods. It discusses natural transformation mechanisms like conjugation and transduction, as well as artificial vector-mediated techniques like Agrobacterium-mediated transformation. Direct methods like microinjection, electroporation, particle bombardment, and chemical methods using PEG or calcium phosphate are also covered. The applications, advantages, and limitations of different techniques are summarized. Overall, the document serves as an informative introduction to the key gene transfer methods used in plant biotechnology.
This document discusses various methods for transferring genes into animal cells, including viral and non-viral approaches. Viral methods use viruses like adenovirus to transfer genes, while non-viral methods include biochemical techniques like calcium phosphate transfection, lipid-mediated transfection using lipofectamine, and physical methods like microinjection, particle bombardment/gene guns, ultrasound, and electroporation. The document provides detailed protocols for lipid-mediated transfection and some of the other non-viral methods.
This document discusses various methods of gene transfer, including viral and non-viral methods. Viral methods use recombinant viruses like retroviruses and adenoviruses to insert genes into host cells. Non-viral methods include physical techniques like electroporation and gene guns that force DNA into cells, as well as chemical methods using lipids, polymers, or proteins to transport DNA into cells. Both methods have advantages and disadvantages related to efficiency, safety, and target specificity.
This document discusses various methods for transfection of animal cells, which is the process of introducing nucleic acids into eukaryotic cells. It describes transfection techniques including calcium phosphate co-precipitation, electroporation, lipofection, viral vectors, and microinjection. The purpose of transfection is to study gene function and protein expression or transfer DNA into embryonic stem cells. Common methods involve using chemicals, lipids, electricity, or viruses to transport DNA/RNA across the cell membrane or directly injecting it using a micropipette.
for cloning and expression of exogenous gene or gene throthrough vector it must be introduced into the host cell through transformation , ,transduction, electroporation gene gun etc.
This document discusses methods for transferring genes between organisms through chemical means. It describes calcium phosphate and lipid-mediated gene transfer, which are two common chemical methods. Calcium phosphate forms a precipitate that binds DNA and transfers it into cells, while lipid-mediated transfer uses liposomes to encapsulate DNA and fuse with cell membranes to deliver the DNA. Both methods can be used for transient or stable transfection but have limitations such as low efficiency. The document also provides details on the mechanisms, advantages, and applications of these chemical gene transfer methods.
This document discusses various techniques for introducing DNA into target organs, including chemical methods like DEAE-dextran and calcium-phosphate coprecipitation, physical methods like biolistic particle delivery and microinjection, and biological methods like Agrobacterium-mediated transformation. It provides details on the principles and advantages and disadvantages of each method.
DNA Transfection in Animal tissue culture and its methods.pptxMethusharma
You will learn the definition of DNA transfection in this presentation its examples, along with the procedures that are employed, through the use of organised flowcharts and diagrams. The Animal Biotechnology course, it is the first technique to learn.
This document summarizes non-viral gene transfer techniques. It discusses that gene expression is the process by which genetic information is used to produce functional products like proteins. Gene therapy techniques use genes to treat diseases by delivering transgenes into cells. Non-viral methods of gene transfer include chemical methods like oligonucleotides, liposomes, lipoplexes, and polymersomes, as well as physical methods like gene guns, electroporation, sonoporation, magnetofection, and hydrodynamic delivery. These non-viral methods facilitate intracellular delivery of DNA through mechanisms like forming transient pores in cell membranes.
This document provides an overview of protein expression in mammalian cells and protein purification techniques. It discusses how mammalian cells are the preferred system for producing mammalian proteins due to their ability to perform post-translational modifications. Common mammalian cell lines for expression include HEK293 and CHO cells. Plasmid vectors are typically used to insert the gene of interest, and transfection methods like lipofection and electroporation can be used to introduce the plasmid into cells. Affinity, size-exclusion, and ion-exchange chromatography are common protein purification techniques.
Gene cloning involves producing exact copies of a gene using genetic engineering techniques. It involves isolating the gene of interest from one organism and inserting it into a vector, which is then introduced into a host organism where the gene can be replicated. There are several methods used to transfer genes between organisms or cells, including bacterial transformation, electroporation, transfection, and microinjection. Bacterial transformation involves directly taking up exogenous DNA, electroporation uses an electric pulse to create pores for DNA entry, while transfection introduces nucleic acids into eukaryotic cells using chemical reagents or viruses.
Introduction and Description to Western Blotting, Steps involved in Western Blotting- Sample Preparation, Protein Gel Electrophoresis, SDS-PAGE, Protein Transfer, Electrophoretic Protein Transfer, Transfer Sandwich Diagram, Blocking, Antibody Probing and Detection, Applications of Western Blotting.
Gene transfer techniques can be used to treat diseases like diabetes. Viruses or vectors can be used to transfer genes like PDX-1 into mice pancreatic cells, causing them to produce insulin and regulating blood sugar. Different gene transfer methods include viral vectors, non-viral methods like microinjection, electroporation, and physical methods like gene guns. While promising, gene therapy faces challenges like low efficiency, safety concerns, and ethical issues that need to be addressed.
Protoplasts are the cells of which cell walls are removed and cytoplasmic membrane is the
outermost layer in such cells.Protoplast can be obtained by specific lytic enzymes to remove
cell wall.Protoplast fusion is a physical phenomenon,during fusion two or more protoplasts
come in contact and adhere with one another either spontaneously or in presence of fusion
inducing agents.
Microbial genetics involves the transmission of hereditary traits in microorganisms. It plays a role in developing fields like molecular and cell biology. Bacteria contain a single circular chromosome made of DNA that is compacted. Bacteria can also contain plasmids. DNA replication copies the parental DNA. Variability in microorganisms comes from changes in genotype and phenotype from factors like mutation and recombination. Mutation rates depend on type and can be increased by mutagens. Recombination involves processes like transformation, transduction, and conjugation. Plasmids can confer traits like antibiotic resistance and are transferred by conjugation. Gene expression in bacteria is regulated through mechanisms like induction and repression that control operons.
This document describes various methods for transferring genes into organisms. Biological methods include using viruses like cauliflower mosaic virus (CaMV) to transfer genes into plants. Physical methods include electroporation, which uses electric pulses to create pores in cell membranes through which DNA can enter. Liposomes and direct methods like microinjection and particle bombardment can also be used to directly transfer DNA. Chemical methods involve using compounds like polyethylene glycol (PEG) to destabilize cell membranes and allow DNA uptake. While physical methods can target single cells, they may damage cells. Biological methods using vectors are often more efficient but less controlled. Overall the document provides an overview of the key gene transfer techniques.
This document provides an overview of various gene transformation techniques, including both vector-mediated and direct methods. It discusses natural transformation mechanisms like conjugation and transduction, as well as artificial vector-mediated techniques like Agrobacterium-mediated transformation. Direct methods like microinjection, electroporation, particle bombardment, and chemical methods using PEG or calcium phosphate are also covered. The applications, advantages, and limitations of different techniques are summarized. Overall, the document serves as an informative introduction to the key gene transfer methods used in plant biotechnology.
This document provides an overview of various gene transformation techniques, including both vector-mediated and direct methods. It discusses natural transformation mechanisms like conjugation and transduction, as well as artificial vector-mediated techniques like Agrobacterium-mediated transformation. Direct methods like microinjection, electroporation, particle bombardment, and chemical methods using PEG or calcium phosphate are also covered. The applications, advantages, and limitations of different techniques are summarized. Overall, the document serves as an informative introduction to the key gene transfer methods used in plant biotechnology.
This document discusses various methods for transferring genes into animal cells, including viral and non-viral approaches. Viral methods use viruses like adenovirus to transfer genes, while non-viral methods include biochemical techniques like calcium phosphate transfection, lipid-mediated transfection using lipofectamine, and physical methods like microinjection, particle bombardment/gene guns, ultrasound, and electroporation. The document provides detailed protocols for lipid-mediated transfection and some of the other non-viral methods.
This document discusses various methods of gene transfer, including viral and non-viral methods. Viral methods use recombinant viruses like retroviruses and adenoviruses to insert genes into host cells. Non-viral methods include physical techniques like electroporation and gene guns that force DNA into cells, as well as chemical methods using lipids, polymers, or proteins to transport DNA into cells. Both methods have advantages and disadvantages related to efficiency, safety, and target specificity.
This document discusses various methods for transfection of animal cells, which is the process of introducing nucleic acids into eukaryotic cells. It describes transfection techniques including calcium phosphate co-precipitation, electroporation, lipofection, viral vectors, and microinjection. The purpose of transfection is to study gene function and protein expression or transfer DNA into embryonic stem cells. Common methods involve using chemicals, lipids, electricity, or viruses to transport DNA/RNA across the cell membrane or directly injecting it using a micropipette.
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Transfection in animal cells through chemical methods like Calcium phosphate precipitation,electroporation,microinjection,lipofection
1. CENTRAL UNIVERSITY OF
HARYANA
COURSE NAME : Animal Biotechnology
Topic : Transfection of animal cells – Calcium phosphate coprecipitation
,electroporation , lipofection,
Peptide , direct DNA transfer , viral
vectors,microinjection
Presented to
Dr. Ram Gopal Nitharwal
Department of
Biotechnology
Presented by
Smriti Ranjan
Msc.Biotech(III
sem)
2. Transfection is the process of introducing foreign genetic material, such as
DNA or RNA, into eukaryotic cells.
It is a crucial technique in molecular biology and biotechnology for studying
gene function, protein expression, and genetic engineering. There are various
methods for transfecting animal cells.
Transfection, technique used to insert foreign nucleic acid (DNA or RNA) into
a cell, typically with the intention of altering the properties of the cell. The introduction
of nucleic acid from a different cell type can be accomplished using various biological,
chemical, or physical methods.
3. There are two type of transfection :
STABLE TRANSFECTION TRANSIENT
TRANSFECTION
In stable transfection
, the plasmid DNA
successfully
integrates into the
cellular genome and
will be passed on to
the future
generation of the
cells.
In transient
transfection , the
transfected material
enters the cell but
does not get
integrated into the
cellular genome .
Thus , a transiently
transfected cell will
only express
transfected DNA for a
short amount of time
and not pass it on to
daughter cells.
4. This methods are divided into 3 categories :
1. Chemical methods
Calcium Phosphate
Lipids
Cationic polymer
2. Physical methods
Electroporation
Microinjection
Laserfection
Sonoporation
Bioloistic particle deliivery
3.Biological methods
Virus-based
5.
6.
7. CALCIUM PHOSPHATE TRANSFECTION
The calcium phosphate transfection technique involves the precipitation of DNA
and calcium phosphate.
The precipitation is facilitated by mixing a HEPES-buffered saline solution,
having sodium phosphate, with calcium chloride solution and DNA. Glycerol
shock is often used to enhance the DNA uptake in certain cells.
While this technique is cost-efficient and can be used for transient or stable
transfections in a wide range of cells, relatively small changes in pH (±0.1) can
affect the efficiency of transformation. Furthermore, it is essential to maintain
reagent consistency for reproducing the assay results. However, this transfection
method does not work in RPMI, or other media with high phosphate
concentrations.
8. Figure : Mechanisms of chemical transfection, including calcium phosphate
precipitation. In calcium phosphate precipitation specifically, a calcium-phosphate-
DNA co-precipitate is formed which facilitates binding to the cell surface and entry of the
nucleic acid into the cell via endocytosis.
In the calcium phosphate precipitation
method, the calcium phosphate
facilitates the binding of the
condensed DNA in the co-precipitate
to the cell surface, and the DNA
enters the cell by endocytosis.
Aeration of the phosphate buffer while
adding the DNA-calcium chloride
solution helps ensure the precipitate
that forms is as fine as possible, which
is important because clumped DNA
will not adhere to or enter the cell as
efficiently.
9.
10. •Advantages:
• Relatively simple and inexpensive.
• Suitable for a wide range of cell types.
•Disadvantages:
• Variable efficiency.
• Cellular toxicity due to the precipitation of calcium
phosphate.
11. LIPOSOME-MEDIATED TRANSFECTION
Liposome-mediated transfection (lipofection) techniques involve the use of
liposome forming cationic lipids, or non-lipid polymers.
Examples of lipofection transfection reagents may include DOTMA (N-[1-(2,3,-
dioleyloxy)propyl]-N,N,N-trimethylammonium chloride)and X-tremeGENE™
transfection reagents, suitable for transfecting a variety of DNA, small RNA, and
CRISPR/Cas9 components into a diverse range of cell lines.
Lipid transfections can also be adapted for cost-effective, as well as high-
throughput systems ; however, these transfections are usually cell-type specific.
12. •Advantages:
• Versatile and effective for a variety of cell types.
• Low cytotoxicity compared to some other methods.
•Disadvantages:
• Batch-to-batch variability.
• Limited cargo capacity for large DNA fragments.
13. ELECTROPORATION
This technique involves the exposure of cell membranes to high-intensity electric
pulses which causes a temporary destabilization in certain areas of the cell.
During this transient destabilization event, the cell membrane becomes highly
permeable and allows the entry of various exogenous molecules including DNA4.
Electroporation is an easy, non-chemical technique that can yield high transformation
efficiencies in various cell types.
Although this technique does not alter target cell morphology and functions, the
method can cause cell death if transfection is not performed under optimum
conditions.
14. Electroporation, also called electropermeabilization, is an efficient, non-viral
delivery system that allows genetic material (DNA and RNA), proteins, drugs or
other molecules to enter cells. It uses an accurately pulsed electrical current to
create temporary pores in the cell membrane through which the molecules can
then pass. This process can be used on a wide variety of cells including
mammalian,1 insect,2 yeast,3 plant4 and bacterial cells.5
Fig : Schematic diagram showing the steps and associated charges during electroporation that lead to the
introduction of exogenous material into the cell, in this case a plasmid.
15. •Advantages:
• High efficiency.
• Suitable for a broad range of cell types.
•Disadvantages:
• Cell viability can be compromised.
• Requires specialized equipment.
16. VIRAL TRANSFECTION (VIRAL
TRANSDUCTION)
This method involves the use of viral vectors to
deliver nucleic acids into cells. Viral delivery
systems such as lentiviral, adenoviral and
oncoretroviral vectors can be used for
transferring nucleic acids, even in hard-to-
transfect cells.
Although viral delivery methods are highly
efficient, they can be quite laborious. Moreover,
most viruses require containment and careful
monitoring of biosafety levels.
Before performing viral transfections, it is also
important to consider several limiting factors
such as the lytic nature of viral vectors, cell line
packaging and host-cell specificity
18. Peptide transfection is a method used to deliver nucleic acids (such as
DNA, RNA, or siRNA) into cells using cationic peptides or protein
transduction domains (PTDs).
This approach is an alternative to traditional transfection methods like
lipofection or electroporation. Peptide transfection has gained attention
due to its relative simplicity, low cytotoxicity, and potential for targeted
delivery.
Peptide
19. Mechanism of Peptide Transfection:
1.Formation of Peptide-Nucleic Acid Complex:
1. Cationic peptides interact with the negatively charged nucleic acids, forming a complex.
This interaction is often driven by electrostatic forces.
2.Cellular Uptake:
1. The positively charged peptide-nucleic acid complex interacts with the negatively charged
cell membrane.
2. Various mechanisms, such as endocytosis or direct translocation, may be involved in the
internalization of the complex into the cell.
3.Endosomal Escape:
1. If endocytosis is involved, the complex may be encapsulated in endosomes. To express
the delivered genetic material, it needs to escape from the endosomes into the cytoplasm.
2. Some peptides possess endosome-disruptive properties, facilitating the release of the
cargo into the cytoplasm.
4.Transport to the Nucleus (if applicable):
1. If the delivered material is DNA, it needs to reach the nucleus for gene expression. Some
peptides may have nuclear localization signals or facilitate transport to the nucleus.
5.Expression of Transferred Genetic Material:
1. Once in the cytoplasm or nucleus, the delivered nucleic acid can be transcribed and
translated, leading to the expression of the encoded protein or other biological effects.
20. Advantages of Peptide Transfection:
1.Low Cytotoxicity:
1. Peptide transfection is often considered less
toxic to cells compared to some other
transfection methods.
2.Targeted Delivery:
1. Some peptides can be modified to have cell-
type or tissue-specific targeting properties.
3.Ease of Use:
1. The simplicity of the method makes it
attractive for certain applications.
Challenges and Considerations
1.Efficiency:
1. Peptide transfection may have
lower efficiency compared to other
methods, particularly in certain cell
types.
2.Cargo Size Limitations:
1. The size of the nucleic acid cargo
that can be effectively delivered
may be limited.
3.Optimization:
1. Optimization of peptide sequences
and experimental conditions may
be required for different cell types
and applications.
4.Endosomal Entrapment:
1. Efficient endosomal escape can be
crucial for successful transfection,
and some peptides may require
modifications to enhance this
process.
21. Direct DNA transfer is a method of introducing foreign DNA into cells without
the use of carriers such as viruses, liposomes, or peptides.
This technique is often used in research settings, and it is relatively simple
compared to other transfection methods.
However, direct DNA transfer is generally less efficient than some other
methods, and its success can depend on various factors such as cell type,
DNA size, and the method of delivery.
Direct DNA transfer
22. Methods of Direct DNA Transfer:
1.Microinjection:
1. In microinjection, a fine micropipette is used to physically
inject DNA directly into the nucleus or cytoplasm of a cell.
2. This method is highly precise but is labor-intensive and
not suitable for high-throughput applications.
2.Particle Bombardment (Gene Gun):
1. In particle bombardment, gold or tungsten particles coated
with DNA are shot into target cells using a gene gun.
2. The particles penetrate the cell membrane, delivering the
DNA directly into the cell.
23. Mechanism of Direct DNA Transfer:
Microinjection:
1.Cell Selection:
1. Cells are typically cultured and selected based on
their adherence and health.
2.Micropipette Preparation:
1. A micropipette is filled with the DNA solution.
3.Cell Microinjection:
1. The micropipette is carefully inserted into the
target cell, and the DNA solution is injected directly
into the nucleus or cytoplasm.
4.Cell Recovery:
1. The injected cells are allowed to recover, and their
subsequent behavior is observed.
24. Particle Bombardment (Gene Gun):
1.Preparation of DNA-Coated Particles:
1. DNA is coated onto gold or tungsten particles.
2.Cell Preparation:
1. Target cells are typically placed on a solid support, such as a
petri dish.
3.Particle Bombardment:
1. The DNA-coated particles are accelerated and shot into the
target cells using a gene gun.
4.Cell Recovery:
1. The cells are allowed to recover, and the expression of the
introduced DNA is monitored.
25. Advantages of Direct DNA Transfer:
1.No Need for Carriers:
1. Direct DNA transfer eliminates the need for viral vectors,
liposomes, or other carriers.
2.Simple Procedure:
1. Microinjection and particle bombardment are relatively
simple techniques, requiring basic laboratory equipment.
3.High Precision:
1. Microinjection allows for precise control over the amount of
DNA injected into each cell.
Challenges and Considerations:
1.Cell Viability:
1. The physical nature of direct DNA transfer methods can affect
cell viability, and optimization is required for different cell types.
2.Efficiency:
1. Direct DNA transfer methods are generally less efficient
compared to some other transfection methods.
3.Cell-Type Specificity:
1. The success of direct DNA transfer can vary depending on the
cell type.
4.Potential Cellular Damage:
1. Microinjection can potentially cause cellular damage, and care
must be taken to minimize this.