Rishabh Maheshwari presents information on transgenic techniques. Transgenics involve introducing foreign DNA into a host organism's genome, typically using a mouse as the host. This allows for engineering organisms with DNA from another source as part of their genetic material. Common methods to create transgenic animals include DNA microinjection, retrovirus-mediated gene transfer, sperm-mediated gene transfer, and embryonic stem cell-mediated gene transfer. Transgenic technology has applications in disease models, pharmaceutical production, agriculture, and industry. While it has benefits, there are also concerns regarding animal welfare and environmental impacts.
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.
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.
Properties of Stem Cells.
Key Research events.
Embryonic Stem Cell.
Stem cell Cultivation.
Stem cells are central to three processes in an organism.
Research & Clinical Application of stem cell.
Research patents.
Conclusion.
Reference.
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.
INTRODUCTION
HISTORY
NEED OF SYNCHRONIZATION
SYNCHRONOUS CULTURES CAN BE OBTAINED IN SEVERAL WAYS:
Physical fractionation .
Chemical appro ach
CENTRIFUGAL ELUTRIATION
Inhibition of DNA synthesis
Nutritional deprivation
SYNCHRONIZATION AT LOW TEMPERATURE
CELLULAR TOTIPOTENCY
SOME HIGHLIGHTS OF CELL SYNCHRONIZATION
REFERENCES
An overview of the Agrobacterium-mediated gene transfer process. Moreover, studied different kinds of Agrobacterium species are involved in this mechanism.
Agrobacterium is a rod-shaped, Gram-negative bacteria found mostly in the soil. It is a plant pathogen that is responsible for causing crown gall disease in them. This bacteria is also known as the natural genetic engineer because of it's the ability to integrate its plasmid Gene into the plant genome.
Agrobacterium tumefaciens transfer of their genetic material T-DNA of Ti-plasmid into the plant cell: A: Agrobacterium tumefaciens; B: Agrobacterium genome; C: Ti Plasmid : a: T-DNA , b: Vir genes , c: Replication origin , d: Opines catabolism genes; D: Plant cell
A Ti-Plasmid (tumor-inducing plasmid) is a ds, circular DNA that often, but not always. It's a piece of genetic equipment that transfers genetic material from bacterial cells means Agrobacterium tumefaciens into plant cells used to induce tumors in the plant. The Ti-plasmid is damage when Agrobacterium is grown above 28 °C. Such cured bacteria don't induce crown gall disease in the plant due to they are avirulent. The Ti-Plasmid are classified into two types on the basis of opine genes are present in T-DNA.
The Plasmid has 196 genes that code for 195 proteins. There is no one structural RNA. The plasmid is 206.479 nucleotides long. the GC content is 56% and 81% of the genetic material is coding genes.
The modification of this plasmid is a very important source in the production of transgenic plants.
The T-DNA must be cut out of the circular plasmid. A VirD1/D2 complex nicks the DNA at the left and right border sequences. The VirD2 protein is covalently attached to the 5' end. VirD2 contains a motif that leads to the nucleoprotein complex being targeted to the type IV secretion system (T4SS).
In the cytoplasm of the recipient cell, the T-DNA complex becomes coated with VirE2 proteins, which are exported through the T4SS independently from the T-DNA complex. Nuclear localization signals, or NLS, located on the VirE2 and VirD2 are recognized by the importin alpha protein, which then associates with importin beta and the nuclear pore complex to transfer the T-DNA into the nucleus. So that the T-DNA can integrate into the host genome.
We inoculate Agrobacterium containing our genes of interest, onto wounded plant tissue explants. The Agrobacterium then transfers the gene of interest into the DNA of the plant tissue.
This presentation covers a general introduction to expression vector, its components, types, and its application. Then it covers some of the expression system with examples.
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
a proper description about the process microinjection and also about gene transfer. and different types of DNA delivery methods.
with advantages, disadvantages, limitations and applications.
Introduction.
Properties of Stem Cells.
Key Research events.
Embryonic Stem Cell.
Stem cell Cultivation.
Stem cells are central to three processes in an organism.
Research & Clinical Application of stem cell.
Research patents.
Conclusion.
Reference.
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.
INTRODUCTION
HISTORY
NEED OF SYNCHRONIZATION
SYNCHRONOUS CULTURES CAN BE OBTAINED IN SEVERAL WAYS:
Physical fractionation .
Chemical appro ach
CENTRIFUGAL ELUTRIATION
Inhibition of DNA synthesis
Nutritional deprivation
SYNCHRONIZATION AT LOW TEMPERATURE
CELLULAR TOTIPOTENCY
SOME HIGHLIGHTS OF CELL SYNCHRONIZATION
REFERENCES
An overview of the Agrobacterium-mediated gene transfer process. Moreover, studied different kinds of Agrobacterium species are involved in this mechanism.
Agrobacterium is a rod-shaped, Gram-negative bacteria found mostly in the soil. It is a plant pathogen that is responsible for causing crown gall disease in them. This bacteria is also known as the natural genetic engineer because of it's the ability to integrate its plasmid Gene into the plant genome.
Agrobacterium tumefaciens transfer of their genetic material T-DNA of Ti-plasmid into the plant cell: A: Agrobacterium tumefaciens; B: Agrobacterium genome; C: Ti Plasmid : a: T-DNA , b: Vir genes , c: Replication origin , d: Opines catabolism genes; D: Plant cell
A Ti-Plasmid (tumor-inducing plasmid) is a ds, circular DNA that often, but not always. It's a piece of genetic equipment that transfers genetic material from bacterial cells means Agrobacterium tumefaciens into plant cells used to induce tumors in the plant. The Ti-plasmid is damage when Agrobacterium is grown above 28 °C. Such cured bacteria don't induce crown gall disease in the plant due to they are avirulent. The Ti-Plasmid are classified into two types on the basis of opine genes are present in T-DNA.
The Plasmid has 196 genes that code for 195 proteins. There is no one structural RNA. The plasmid is 206.479 nucleotides long. the GC content is 56% and 81% of the genetic material is coding genes.
The modification of this plasmid is a very important source in the production of transgenic plants.
The T-DNA must be cut out of the circular plasmid. A VirD1/D2 complex nicks the DNA at the left and right border sequences. The VirD2 protein is covalently attached to the 5' end. VirD2 contains a motif that leads to the nucleoprotein complex being targeted to the type IV secretion system (T4SS).
In the cytoplasm of the recipient cell, the T-DNA complex becomes coated with VirE2 proteins, which are exported through the T4SS independently from the T-DNA complex. Nuclear localization signals, or NLS, located on the VirE2 and VirD2 are recognized by the importin alpha protein, which then associates with importin beta and the nuclear pore complex to transfer the T-DNA into the nucleus. So that the T-DNA can integrate into the host genome.
We inoculate Agrobacterium containing our genes of interest, onto wounded plant tissue explants. The Agrobacterium then transfers the gene of interest into the DNA of the plant tissue.
This presentation covers a general introduction to expression vector, its components, types, and its application. Then it covers some of the expression system with examples.
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
a proper description about the process microinjection and also about gene transfer. and different types of DNA delivery methods.
with advantages, disadvantages, limitations and applications.
Transgenesis is the future of healthcare where the world is focusing on it so why not us? Let's delve into the exclusive depth of this transgenesis in the slide.
the following file contains information regarding the research based on transgenic animals. It is a biotechnological approach and an assignment(report) of a student of B.S.C second-year biotechnology.
Transgenic manipulation of animal embryos and its applicationDeveshMachhi
INTRODUCTION
Genetic manipulation in animal for higher productivity is also called genetic engineering, refer to the alteration of the gene of an organism.
Organisms containing integrated sequences of cloned dna (transgenes), transferred using techniques of genetic engineering (to include those of gene transfer and gene substitution) are called transgenic animals.
Transgenic technology has led to the development of fishes, live stock and other animals with altered genetic profiles which are useful to mankind.Genetically modified animals are proving ever more vital in the development of new treatments and cures for many serious diseases.
Transgenesis is a radically new technology for altering the characteristics of animals by introducing the foreign genetic material.
CONTACT: devmac1323@gmail.com
It's include all the details about the transgenic technology.all the techniques like micro injection,SCNT,pro nuclear injection method.It include all the Transgenic mice bird and fish.
Animal breeding is a process that is being used from many years ago. In the earlier days, the breeders use to increase the qualities in the animals by using breeding and other methods. But by the invention of the molecular techniques, it is become easier to manipulate any animal and to enhance the traits or different qualities in the animals. In this regard, different methods have used these methods are discussed in this article. The animal transgenesis is used for different purposes such as in research purposes, like organ transplant source for humans, as protein extraction sources, as drug extraction process, in hormones production, and in many other purposes.
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2. Transgenic techniques describes the process of introducing foreign
deoxyribonucleic acid (DNA) into a host organism's Genome
Transgenic techniques is a technique in which an organism (typically
a mouse) that is engineered to carry a foreign gene, or transgene of
choice as part of its own genetic material for Disease models and
human welfare.
Transgenics are genetically modified organisms with DNA from
another source inserted into their genome. A large number of
transgenic animals have been created such as Mice, Cows, Pigs,
Sheep, Goats, Fish, and Frogs.
TRANSGENIC TECHNOLOGY
3. DNA microinjection.
Retrovirus-mediated gene transfer (RMGT).
Sperm-mediated gene transfer (SMGT).
Embryonic stem cell-mediated gene transfer.
METHODS USED FOR ANIMAL
4. In the past 20 years, DNA microinjection has become the most widely
applied method for gene transfer in animals.
Introducing the transgene DNA directly into the zygote at an
early stage of development. (No vector required)
This method involves:
1)Transfer of a desired gene construct (of a single gene or a combination of
genes that are recombined and then cloned) from another member of the same
species or from a different species into the pronucleus of a reproductive cell;
2)In vitro culture of the manipulated cells to develop to a specific embryonic
phase; and
3) Then transfer of the embryonic cells to the recipient female.
1. DNA Microinjection
5. Microinjection
into the germ line >
transgenic animal
Gene injected into the
male pronuclei (i.e
Pronuclei injn
)
6. 2. Retrovirus-mediated gene transfer
(RMGT) The word “retro” means, when the virus vectors infect a host cell, the
viral RNA is reverse transcribed in the cytoplasm making linear double-
stranded DNA.
A retrovirus is a virus that carries its genetic material in the form of RNA
rather than DNA.
In this method, retroviruses are used as vectors to transfer genetic
material into the host cell, resulting in a chimera, an organism consisting
of tissues or parts of diverse genetic constitution.
When cells are infected by retroviruses, the resultant viral DNA, after
reverse transcription and integration, becomes a part of the host cell
genome to be maintained for the life of the host cell.
7. 3. Sperm-mediated gene transfer (SMGT)
SMGT is a simple and efficient technique to produce transgenic mice.
Use of “Linker protein" to attach DNA to sperm which transfer the new
DNA during fertilization.
8. The blastocyst (inner layer of a fertilized egg) is harvested and mixed
with recombinant DNA and inserted back in the blastocyst.
This method involves:
Isolation of totipotent stem cells (stem cells that can develop into
any type of specialized cell) from embryos.
The desired gene is inserted into these cells.
Cells containing the desired DNA are incorporated into the host's
embryo.
4. Embryonic stem cell-mediated gene transfer
9. In this technique, DNA was mixed with sperm cells before in vitro. 30% of
offspring mouse were integrated in foreign DNA.
The basic principle of sperm-mediated gene transfer is: seminal plasma-free
sperm cells are suspended in the appropriate medium, and then incubated
with DNA.
The resultant DNA-carrying sperms are then used to fertilize eggs, via in
vitro fertilization or artificial insemination or, in the case of aquatic animals,
via waterborne (natural) fertilization.
10.
11. Transgenic technology holds a great potential in different groups on the
basis of benefits of these animals to human welfare can be grouped
into areas:
1. Clinical Application,
2. Agricultural application,
3. Industrial application, and
4. Transgenic model (Mice).
APPLICATION OF TRANSGENIC
TECHNOLOGY
12. (A) Models for human disease
The biomedical sciences rely heavily on animal models as tools for the
discovery and development of therapeutic interventions. Some examples
include:
Gene Therapy: Human gene therapy involves adding a normal copy of a
gene (transgene) to the genome of a person carrying defective copies of the
gene.
Genetic basis of human and animal disease.
Disease resistance in humans and animals.
Drug and product testing and/or screening.
1. CLINICAL APPLICATION
13. (B) Production of Pharmaceutical in transgenic animals
The impact of transgenic animals on pharmaceutical development could
soon expand as recombinant proteins expressed and secreted by transgenic
animals move toward regulatory approval and production.
ATryn®, was the first product derived from a transgenic animal to be
submitted for formal regulatory approval in Europe or the USA.
(C) Transgenic expression of immunoglobulin's
Transgenic animal producing a disease specific Ig, chimeric Igs were
created by ligating the variable region exon of a previously characterized Ig
to the constant region exon.
14. (D)Xenotransplantation
Transplanted organs may be obtained from transgenic animals. E.g.
Transgenic pigs may provide the transplanted organs needed to alleviate the
shortfall.
Currently, xenotransplantation is hampered by a pig protein that can cause
donor rejection but research is underway to remove the pig protein and
replace it with a human protein. For organ and tissue transplantation, which
is known as a "species of daughter cells “
15. (A) Breeding
Traditional cross breeding have been used for ages to create chickens,
cows, pigs etc.
Farmers have always used selective breeding to produce animals that
exhibit desired traits (e.g., increased milk production, high growth rate).
Traditional breeding is a time-consuming, difficult task.
2. AGRICULTURAL APPLICATION
16. (B) Quality
Herman, a transgenic bull carries a human gene for Lactoferrin
(gene responsible for higher iron content)
Pigs and cattle that have more meat on them.
Sheep that grow more wool.
Eggs can be made healthier with high quality protein.
17. By extracting polymer strands from the milk and weaving them
into thread, the scientists can create a light, tough, flexible material
that could be used in such applications as military uniforms,
medical micro sutures, and tennis racket strings.
Microorganisms have been engineered to produce a wide variety of
proteins, which in turn can produce enzymes that can speed up
industrial chemical reactions.
3. INDUSTRIAL APPLICATION
18. Genetically modified mice are the most common animal
model for transgenic research. Transgenic mice are
currently being utilized to study a variety of diseases
including cancer, obesity, heart disease, arthritis, anxiety,
and Parkinson’s disease.
The two most common types of genetically modified
mice are knockout mice and oncomice .
4. TRANSGENIC MODEL (MICE)
19. Transgenic mice can be used both as model systems for human diseases
and as test cases to determine if the production of a potential therapeutic
agent is feasible.
However, a mouse or rodent is not a human being, even though it is a
mammal, and thus the information gathered from transgenic rodent is not
always medical relevant.
But, on the other hand, clinical insight about the etiology of a complex
diseases can be discovered.
This technique is used for the treament of Alzheimer disease, arthritis,
muscular dystrophy, tumorigenesis, hypertension, neurodegenerative
disorders, endocrinological dysfunction, coronary disease, obesity and
many others diseases.
USES OF ANIMAL MODEL
20. ADVANTAGES OF TRANSGENIC MODEL
These animals are very useful for delineating the function of newly
discovered genes as well as for producing useful proteins in large animals.
Transgenic animals are useful as disease models and producers of
substances for human welfare.
Regulation of gene expression.
Transgenic animals have potentially broad application for the
improvement of animal production quality, the enhancement of
productivity, the studies of human disease models and the production of
pharmaceuticals.
21. Though the field of transgenic animals has advanced
considerably but few advancements are considered to be
most important.
• Introduction of the transgene
• Transgene integration
• Transgene expression
• Transgene transmission
• Use of embryonic stem cells
• Pharmaceutical products from transgenic animals
SOME IMPORTANT ADVANCES
22. Many animals die or are born horribly disfigured as research is
conducted.
Transgenic animals can radically change the direction of evolution,
which can result in drastic consequences for nature and humans
alike.
Dietary and food safety concerns: Foreign gene inserted in the
chromosome locus may also result in different genetic changes in
different degrees, causing unintended effects.
Environmental impacts: It may also lead to the loss of the wild life,
resulting in a decline in genetic diversity.
DISADVANTAGES OF TRANSGENIC
MODEL
23. Transgenic technology have been developed rapidly and provided
more and improved platforms for the preparation of transgenic
animals since their emergence.
All of these developments will provide new ideas and bring forth
important changes in fields like medicine, health and livestock
improvement.
In particular, the economic and social benefits from the production
of bioreactors, drug production, and organ culture for human
transplantation will be great.
CONCLUSION
24. 1. Beardmore, J.A. (1997) Transgenics: autotransgenics and
allotransgenics. Transgen. Res.6,107–108.
2. Polites, H.G. and Pinkert, C.A. (2002) DNA Microinjection and
Transgenic Animal Production. In Transgenic Animal
Technology: A Laboratory Handbook(2nd edition) (Pinkert,
C.A.,ed.), pp. 15–70, Academic Press.
3. Dorling, A. and Lechler, R.I. (1997) Xenotransplantation:
immune barriers beyond hyperacute rejection . Clin. Sci.93,493–
505.
4. Brinster, R.L.et al.(1983) Expression of a microinjected
immunoglobulin gene in the spleen of transgenic
mice.Nature306, 332–336
REFERENCES
25. 5. McGrath, J. and Solter, D. (1983) Nuclear transplantation in the
mouse embryo by microsurgery and cell fusion.Science220,
1300–1302.
6. Lin, T.P. (1966) Microinjection of mouse eggs. Science151,333–
337.
7. Gordon, J.W.et al.(1980) Genetic transformation of mouse
embryos by microinjection of purified DNA.Proc. Natl. Acad.
Sci. U. S. A.77,7380–7384.
8. Pinkert, C.A. (2002) Introduction to transgenic animal
technology. In Transgenic Animal Technology: A Laboratory
Handbook(2nd ed.)(Pinkert, C.A., ed.), pp. 3–12, Academic
Press.