gene cloning
DESCRIPTION
gene cloning basics...TRANSCRIPT
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GENE CLONING
BHUPENDRA SINGH RATHORE
B.sc. Biotech (II Sem.)
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GENE CLONING
What does the term cloning mean?What is gene cloning? How does it differ
from cloning an entire organism?Why is gene cloning done?How is gene cloning accomplished ?What are some of the ethical
considerations regarding gene cloning?
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CLONING-A DEFINITIONFrom the Greek - klon, a twig
An aggregate of the asexually produced progeny of an individual; a group of replicas of all or part of a macromolecule (such as DNA or an antibody)
An individual grown from a single somatic cell of its parent & genetically identical to it
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What is DNA cloning ?When DNA is
extracted from an organism, all its genes are obtained
In gene (DNA) cloning a particular gene is copied (cloned)
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What is gene cloning ?
• To "clone a gene" is to make many copies of it• Act of making many identical copies of gene• Gene can be an exact copy of a natural gene • Gene can be an altered version of a natural
gene
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Whole organisms are cloned too, but differently
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Why we clone dna ?A particular gene can be isolated and its
nucleotide sequence determinedControl sequences of DNA can be identified &
analyzedProtein/enzyme/RNA function can be
investigatedMutations can be identified, e.g. gene defects
related to specific diseasesOrganisms can be ‘engineered’ for specific
purposes, e.g. insulin production, insect resistance, etc.
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HOW IS DNA CLONED ?Cell based DNA
cloning Cell-free DNA cloning (PCR)
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Cell based DNA cloning
DNA is extracted- here from blood
Restriction enzymes, e.g. EcoRI, HindIII, etc., cut the DNA into small pieces
Different DNA pieces cut with the same enzyme can join, or recombine.
RESTRICTION ENDONUCLEASE
Blood sample
DNA
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DNA CLONING I
The action of a restriction enzyme, EcoRINote: EcoRI gives a ‘sticky’ end
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DNA CLONING II
Bacterial plasmids (small circular DNA additional to a bacteria’s regular DNA) are cut with the same restriction enzyme
A chunk of DNA can thus be inserted into the plasmid DNA to form a “recombinant”
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DNA CLONING III
The recombinant plasmids are then mixed with bacteria which have been treated to make them “competent”, or capable of taking in the plasmids
This insertion is called transformation
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DNA CLONING IV
The plasmids have naturally occurring genes for antibiotic resistance.
Bacteria containing plasmids with these genes will grow on a medium containing the antibiotic- the others die, so only transformed bacteria survive
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Antibiotic resistance (screening)
The medium in this petri dish contains the antibiotic Kanamycin.
The bacteria on the right contain Kanr, a plasmid that is resistant to Kanamycin, while the one on the left has no resistance.
Note the difference in growth.
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DNA CLONING V
The transformed bacterial cells form colonies on the medium
Each cell in a given colony has the same plasmid (& the same DNA)
Cells in different colonies have different plasmids (& different DNA fragments)
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Cell free DNA cloning (PCR)
Developed in the mid 1980s.Kary Mullis - Nobel prize (1993).Revolutionized molecular biology.DNA fragments can be amplified in
large amounts.In vitro technique.
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What do we need for PCR?
Sequence informationOligonucleotide primers
DNANucleotides
Heat-stable DNA polymeraseTaq (Thermus aquaticus)
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PCR techniqueds DNA
Step 1
Step 2
Step 3
Denature
Anneal
Extend
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PCR amplifies DNA(gene)
1st cycle
2nd cycle
1st cycle
2nd cycle
3rd cycle
4th cycle
5th cycle
6th cycle
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Any questions
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