This document discusses various techniques for gene transfer, including natural methods like conjugation, transformation, and transduction, as well artificial methods like microinjection, biolistics, calcium phosphate and liposome mediated transfer, and electroporation. It provides details on how each method works, such as how conjugation involves transfer of DNA between bacteria via sex pili, and how electroporation uses electrical pulses to create pores in cell membranes to allow DNA entry. The document also summarizes screening and applications of transgenic techniques.
Introduction
Definition
History
Why are the transgenic animals being produced
Transgenic mice
Mice: as model organism
Methods of creation of transgenic mice
knock-out mice
Application of transgenic mice
Conclusion
References
A knockout mouse is a mouse in which a specific gene has been inactivated or“knocked out” by replacing it or disrupting it with an artificial piece of DNA.
The loss of gene activity often causes changes in a mouse's phenotype and thus provides valuable information on the function of the gene.
What is Genome,Genome mapping,types of Genome mapping,linkage or genetic mapping,Physical mapping,Somatic cell hybridization
Radiation hybridization ,Fish( =fluorescence in - situ hybridization),Types of probes for FISH,applications,Molecular markers,Rflp(= Restriction fragment length polymorphism),RFLPs may have the following Applications;Advantages of rflp,disAdvantages of rflp, Rapd(=Random amplification of polymorphic DNA),Process of rapd, Difference between rflp &rapd
This presentation gives an brief idea about the applications of genetic engineering which is of at most importance to humans. Provided along with this slide is an example which makes it easier to understand the concept.
The direct microinjection of DNA into the cytoplasm or nuclei of cultured cells is sometimes used as a transfection method. It is highly efficient at the level of individual cells. The most significant use of this technique is introduction of DNA into the oocytes, eggs and embryos of animals, either for transient expression analysis (e.g. in fish or Xenopus) or to generate transgenic animals (e.g. mice, Drosophilathis). The procedure is time consuming and only a small number of cells can be treated. Originally, this technique was used for the transformation of cells that were resistant to any other method of transfection. Stable transfection efficiencies are extremely high, in the order of 20%, and very small quantities of DNA are sufficient.
This technique provides direct nuclear delivery of DNA avoiding the endogenous pathway and also ensures that the DNA is delivered intact. Microinjection is suitable for the introduction of large vectors such as YACs into the pronuclei of fertilized mouse eggs. DNA delivered in this manner must be very pure so it needs a lot of preparation as it is necessary to avoid fragmentation. Shearing can also occur in the delivery needle, and large DNA fragments are often protected by suspension in a high salt buffer and/or mixing with polyamines and other protective agents. Now transfection of cultured cells is automated with computer-controlled micromanipulation and microinjection processes as well as the automated production of injection capillaries and the standardization of cell preparation procedure.
Introduction
Definition
History
Why are the transgenic animals being produced
Transgenic mice
Mice: as model organism
Methods of creation of transgenic mice
knock-out mice
Application of transgenic mice
Conclusion
References
A knockout mouse is a mouse in which a specific gene has been inactivated or“knocked out” by replacing it or disrupting it with an artificial piece of DNA.
The loss of gene activity often causes changes in a mouse's phenotype and thus provides valuable information on the function of the gene.
What is Genome,Genome mapping,types of Genome mapping,linkage or genetic mapping,Physical mapping,Somatic cell hybridization
Radiation hybridization ,Fish( =fluorescence in - situ hybridization),Types of probes for FISH,applications,Molecular markers,Rflp(= Restriction fragment length polymorphism),RFLPs may have the following Applications;Advantages of rflp,disAdvantages of rflp, Rapd(=Random amplification of polymorphic DNA),Process of rapd, Difference between rflp &rapd
This presentation gives an brief idea about the applications of genetic engineering which is of at most importance to humans. Provided along with this slide is an example which makes it easier to understand the concept.
The direct microinjection of DNA into the cytoplasm or nuclei of cultured cells is sometimes used as a transfection method. It is highly efficient at the level of individual cells. The most significant use of this technique is introduction of DNA into the oocytes, eggs and embryos of animals, either for transient expression analysis (e.g. in fish or Xenopus) or to generate transgenic animals (e.g. mice, Drosophilathis). The procedure is time consuming and only a small number of cells can be treated. Originally, this technique was used for the transformation of cells that were resistant to any other method of transfection. Stable transfection efficiencies are extremely high, in the order of 20%, and very small quantities of DNA are sufficient.
This technique provides direct nuclear delivery of DNA avoiding the endogenous pathway and also ensures that the DNA is delivered intact. Microinjection is suitable for the introduction of large vectors such as YACs into the pronuclei of fertilized mouse eggs. DNA delivered in this manner must be very pure so it needs a lot of preparation as it is necessary to avoid fragmentation. Shearing can also occur in the delivery needle, and large DNA fragments are often protected by suspension in a high salt buffer and/or mixing with polyamines and other protective agents. Now transfection of cultured cells is automated with computer-controlled micromanipulation and microinjection processes as well as the automated production of injection capillaries and the standardization of cell preparation procedure.
this presentation is about the molecular markers as we all know the molecular markers are the DNA sequences it can be easily detected and its inheritance is easily monitored.so the main basics of the molecular markers is the polymorphic nature so it can used as molecular markers.and this will gives you the idea about AFLP, RFLP, RAPD, SNPS,ETC.
Gene transfer technology pharmacology biotechnology basic methods
Natural, physical, chemical methods of gene transfer.
Along with advantages and limitations, and applications.
Genetic transformation in prokaryotes has led to the discovery of the three major methods of transformationin bacteria i.e transformation, conjugation and transuction whichcommonly uses the bacterial- phages as vectors to transfer dna.
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.
How to Make a Field invisible in Odoo 17Celine George
It is possible to hide or invisible some fields in odoo. Commonly using “invisible” attribute in the field definition to invisible the fields. This slide will show how to make a field invisible in odoo 17.
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Letter from the Congress of the United States regarding Anti-Semitism sent June 3rd to MIT President Sally Kornbluth, MIT Corp Chair, Mark Gorenberg
Dear Dr. Kornbluth and Mr. Gorenberg,
The US House of Representatives is deeply concerned by ongoing and pervasive acts of antisemitic
harassment and intimidation at the Massachusetts Institute of Technology (MIT). Failing to act decisively to ensure a safe learning environment for all students would be a grave dereliction of your responsibilities as President of MIT and Chair of the MIT Corporation.
This Congress will not stand idly by and allow an environment hostile to Jewish students to persist. The House believes that your institution is in violation of Title VI of the Civil Rights Act, and the inability or
unwillingness to rectify this violation through action requires accountability.
Postsecondary education is a unique opportunity for students to learn and have their ideas and beliefs challenged. However, universities receiving hundreds of millions of federal funds annually have denied
students that opportunity and have been hijacked to become venues for the promotion of terrorism, antisemitic harassment and intimidation, unlawful encampments, and in some cases, assaults and riots.
The House of Representatives will not countenance the use of federal funds to indoctrinate students into hateful, antisemitic, anti-American supporters of terrorism. Investigations into campus antisemitism by the Committee on Education and the Workforce and the Committee on Ways and Means have been expanded into a Congress-wide probe across all relevant jurisdictions to address this national crisis. The undersigned Committees will conduct oversight into the use of federal funds at MIT and its learning environment under authorities granted to each Committee.
• The Committee on Education and the Workforce has been investigating your institution since December 7, 2023. The Committee has broad jurisdiction over postsecondary education, including its compliance with Title VI of the Civil Rights Act, campus safety concerns over disruptions to the learning environment, and the awarding of federal student aid under the Higher Education Act.
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2. INTRODUCTION
• Gene transfer is to transfer a gene from one DNA molecule to
another DNA molecule.
• The directed desirable gene transfer from one organism to
another and the subsequent stable integration & expression of
foreign gene into the genome is referred as genetic
transformation.
• Transient transformation occur when DNA is not integreted
into host genome
3. • Stable transformation occur when DNA is integrated into host
genome and is inherited in subsequent generations.
• The transferred gene is known as transgene and the organism
that develop after a successful gene transfer is known as
transgenic.
4. METHODS OF GENE TRANSFER
DNA transfer by natural methods
• 1. Conjugation
• 2. Bacterial transformation
• 3. Retroviral transduction
• 4. Agrobacterium mediated transfer
5. DNA TRANSFER BY ARTIFICIAL METHODS
•
•
•
•
•
•
•
•
Physical methods
1. Microinjection
2. Biolistics transformation
Chemical methods
1. DNA transfer by calcium phosphate method
2. Liposome mediated transfer
Electrical methods
1. Electroporation
6. CONJUGATION
• Requires the presence of a special plasmid called the F
plasmid.
• Bacteria that have a F plasmid are referred to as as F+ or
male. Those that do not have an F plasmid are F- of female.
• The F plasmid consists of 25 genes that mostly code for
production of sex pilli.
• A conjugation event occurs when the male cell extends his
sex pilli and one attaches to the female.
7. • This attached pilus is a temporary cytoplasmic bridge
through which a replicating F plasmid is transferred from
the male to the female.
• When transfer is complete, the result is two male cells.
• When the F+ plasmid is integrated within the bacterial
chromosome, the cell is called an Hfr cell (high frequency
of recombination cell).
8.
9. TRANSFORMATION
• transformation is the direct uptake of exogenous DNA from its
surroundings and taken up through the cell membrane .
• Transformation occurs naturally in some species of bacteria,
but it can also be effected by artificial treatment in other
species.
• Cells that have undergone this treatment are said to be
competent.
• Any DNA that is not integrated into he chromosome will be
degraded.
10.
11. TRANSDUCTION
• Gene transfer from a donor to a recipient by way of a
bacteriophag..
• If the lysogenic cycle is adopted, the phage chromosome is
integrated (by covalent bonds) into the bacterial chromosome,
where it can remain dormant for thousands of generation
• The lytic cycle leads to the production of new phage particles
which are released by lysis of the host.
12.
13. AGROBACTERIUM MEDIATED
TRANSFER
• Agrobacterium tumefaciens is a soil borne gram negative
bacterium.
• It invades many dicot plants when they are injured at the soil
level and causes crown gall disease.
• The ability to cause crown gall disease is associated with the
presence of the Ti (tumour inducing) plasmid within the
bacterial cell.
• Ti plasmid can be used to transport new genes into plant cells.
14. THE Ti-PLASMIDS
• A remarkable feature of the Ti plasmid is that, after infection, part of
the molecule is integrated into the plant chromosomal DNA .
• This segment, called the T-DNA, is between 15 and 30 kb in size,
depending on the strain.
• T-DNA contains eight or so genes that are expressed in the plant cell
and are responsible for the cancerous properties of the transformed
cells.
• These genes also direct synthesis of unusual compounds, called
opines, that the bacteria use as nutrient.
15. • The vir (virulence) region of the Ti- plasmid contains the
genes required for the T-DNA transfer process.
• The genes in this region encode the DNA processing
enzymes required for excision, transfer and integration of the
T-DNA segment.
16. • The T-DNA region of any Ti
plasmid is defined by the
presence of the right and the
left border sequences.
• These border sequences are 24
bp imperfect repeats.
• Any DNA between the borders
will be transferred in to the
genome of the plant.
17. Ti-Plasmid mediated
transfer of gene into a plant
• The Ti-Plasmid has an innate ability to transmit bacterial DNA
into plant cells.
• The gene of a donor organism can be introduced into the Ti
plasmid at the T-DNA region
• This plasmid now becomes a recombinant plasmid.
• By Agrobacterium infection, the donor genes can transferred
from the recombinant Ti- Plasmid and integrated into the
genotype of the host plant.
18. •
•
•
•
•
•
•
•
•
VECTORLESS or DIRECT GENE
TRANSFER
Physical methods
1. Microinjection
2. Biolistics transformation
Chemical methods
1. DNA transfer by calcium phosphate method
2. Liposome mediated transfer
3. Transfer of DNA by use of polyethene glycol
Electrical methods
1. Electroporation
19. Electroporation
• Electroporation uses electrical pulse to produce transient
pores in the plasma membrane thereby allowing DNA into
the cells.
• These pores are known as electropores.
•
20. • The cells are placed in a solution containing DNA and
subjected to electrical pulse to cause holes in the
membrane.
• The foreign DNA fragments enter through holes into the
cytoplasm and then to nucleus.
21. Advantages of Electroporation
• 1. Method is fast.
• 2. Less costly.
• 3. Applied for a number of cell
types.
• 4. Simultaneously a large number
of cell can be treated.
• 5. High percentage of stable
transformants can be produced
22. Microinjection
The microinjection is the process of transferring the desirable
DNA into the living cell ,through the use of glass
micropipette .
Glass micropipette is usually of 0.5 to 5 micrometer,
easily penetrates into the cell membrane and nuclear
envelope.
The desired gene is then injected into the sub cellular
compartment and needle is removed
25. Biolistics or Microprojectiles
• Biolistics or particle bombardment is a physical method that
uses accelerated microprojectiles to deliver DNA or other
molecules into intact tissues and cells.
• The gene gun is a device that literally fires DNA into target
cells .
• The DNA to be transformed into the cells is coated onto
microscopic beads made of either gold or tungsten.
26. • The coated beads are then attached to the end of the plastic
bullet and loaded into the firing chamber of the gene gun.
• An explosive force fires the bullet with DNA coated beads
towards the target cells that lie just beyond the end of the
barrel.
• Some of the beads pass through the cell wall into the
cytoplasm of the target cells
27.
28. Liposome mediated gene transfer
• Liposomes are spheres of lipids which can be used to transport
molecules into the cells.
• These are artificial vesicles that can act as delivery agents for
exogenous materials including transgenes.
• Promote transport after fusing with the cell membrane.
• Cationic lipids are those having a positive charge are used for
the transfer of nucleic acid.
30. Calcium phosphate mediated DNA transfer
• The process of transfection involves the admixture of isolated
DNA (10-100ug) with solution of calcium chloride and
potassium phosphate so precipitate of calcium phosphate to be
formed.
• Cells are then incubated with precipitated DNA either in
solution or in tissue culture dish.
• A fraction of cells will take up the calcium phosphate DNA
precipitate by endocytosis.
32. Polyethylene glycol mediated transfection
• This method is utilized for protoplast only.
• Polyethylene glycol stimulates endocytosis and therefore DNA
uptake occurs.
• Protoplasts are kept in the solution containing polyethylene
glycol (PEG).
• After transfer of DNA to the protoplast in presence of PEG
and other chemicals, PEG is allowed to get removed
33. SCREENING OF TRANSGENE
• The presence of transgene or gene of interest is detected by
several methods:
• A selectable marker gene
• Southern blot techniques
• Northern bolt technique
• Western blot technique
34. APPLICATION
•
•
•
•
•
•
•
•
Clinical gene transfer applications
Vaccine Development
Production of transgenic animals
Treatment of Cancer, AIDS
Gene Discovery
Gene Therapy
Enhancing the resistance of plants
GMO
35. REFERENCES
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•
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•
•
Sukharev, S.I., Klenchin, V.A., Serov, S.M., Chernomordik, L.V. & Chizmadzhev, Y.A. (1992). Electroporation
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1320-1327.
[2] Chu, G., Hayakawa, H. & Berg, P. (1987). Electroporation for the efficient transfection of mammalian cells with
DNA. Nucleic Acids Res., 15 (3): 1311-1326.
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R.B. & Okano, H. (1999). Mammalian ELAV-like neuronal RNAbinding proteins HuB and HuC promote
neuronal development in both the central and the peripheral nervous systems. Proc. Natl. Acad. Sci. USA., 96
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9885-9890.
[4] Osumi, N. & Inoue, T. (2001). Gene transfer into cultured mammalian embryos by electroporation. Methods., 24
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Jogdand, S.N. (2006). Gene Biotechnology. Himalaya Publishing House. Mumbai, India. 2nd ed., p 237-249.
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Watwe, R.M. & Bellare, J.R. (1995). Manufacture of liposomes a review. Curr. Sci. India., . Nicolau, C., Legrand,
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