introduction to biotechnology - tamalpais union high ...€¦ · introduction to biotechnology...
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Introduction to
Biotechnology
Manipulating and Analyzing DNA
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Uses of Biotechnology
Analyzing human DNA
Genetic diseases
DNA fingerprinting
Forensics
The Human Genome Project
Identifying all genes in the human genome
Gene therapy
Curing disease
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Genetic EngineeringDefinition: introducing a set of genetic information
(genes) directly into an organisms DNA
How is this done?
With use of restriction enzymes
Plasmid DNA
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Restriction EnzymesProteins originally
made to protect
against viruses
Restriction Enzymes
chut DNA at specific
sequences called
recognition sites
Recognition sites
are sequences of
DNA that enzymes
recognize
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The “Ends”Two types of cuts result from restriction enzymes: “Sticky” ends leave exposed bases ready to hydrogen
bond. Eco RI below is an example.
“Blunt” ends leave NO bases exposed Eco RV below is an example
DNA ligase joins “the ends” of cut DNA together
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DNA Recombination
DNA fragments cannot function all by
themselves
They must become part of the genetic
material of LIVING cells before the genes
they contain can be activated
DNA fragments + DNA from a living cell =
Recombinant DNA
DNA fragments are often inserted in
plasmids (found in bacteria) that have
been cut with the same sticky ends
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Plasmids
Circular double-stranded DNA (bacterial)
Used in biotechnology because they are
circular, small, and replicate on their own
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Plasmids + DNA of interest
Restriction enzyme
EcoRI used to isolate
gene of interest
Same restriction
enzyme EcoRI used
to cut plasmid DNA
Sticky ends match up.
Gene of interest is
inserted into
plasmid=recombinant
DNA
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Genetic Engineering Example
Insulin is made for diabetics
a) Cut open plasmid and DNA with gene encoding for insulin with restriction enzymes
b) Mix cut plasmid with cut DNA (they have the same sticky ends)
c) Seal with ligase
d) Insert recombinant DNA (plasmid) into bacteria
e) Recombinant DNA replicates and bacteria divides
f) DNA is transcribed and translated = insulin
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Engineering New Organisms
Transgenic Organisms:
Organisms that contain
“foreign” DNA are termed
transgenic
May be bacteria, plants,
or animals
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Examples of GFP gene
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This All Involves One Thing…
DNA Sequencing:
reading or identifying
the sequence of
bases along the
length of a DNA
molecule AND
understanding what
that sequence codes
for…