Download - Biotechnology CLIL module
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Biotechnology
CLIL MODULE ABOUT…
Author: Prof.ssa Elena Bruno
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UNIT 1CONTENTS
• What’s biotechnology?• How old is biotechnology?• Differences between
traditional and innovative biotechnology
• Recombinant DNA technology
• Production of insulinwith recombinant DNA technology
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What is biotechnology?
Biotechnology is the use of living cells or organisms to produce materials useful to people.
TraditionalBiotechnology
Innovative Biotechnology
Use of living beings and selection ofnatural features in living beings
use of genetically engineeredmicroorganisms, plant and animal cells
GMO
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How Old Is Biotechnology?10,000 BCDomesticating Crops
1880’s Production of Vaccines
Domesticating Animals8,000-9,000 BC
4,000 BC Leavening Bread
6,000 BC Brewing Beer
1940’s Production of Antibiotics
1980’s Use of genetically modified organisms
molds
yeasts
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Do traditional biotechnologymodify living beings?
Old biotechnology modifies living beings by selective breeding ofplants/animals: on the contrary of modern biotechnology, scientists do notdirectly modify the DNA
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Do traditional biotechnologymodify living beings?
The traditional biotechnology also use radiations (such as X-rays) to increasethe rate of mutations in the DNA of a species (such as wheat): in this way it ispossible to increase the genetic variability in a short time and to obtainfavorable variations. For example the variety "wheat Creso" was obtained inthis way.
irradiated wheat is not a GMO!
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Do innovative biotechnologymodifies living beings?
Modern biotechnology modifygenetic material (DNA) in a waythat does not occur naturally bymating and/or naturalrecombination
EXAMPLE: Resistance against insects is achieved by incorporating into the food plant the gene for toxin production from the bacterium Bacillus thuringiensis (Bt)
CORN COB
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Applications of biotechnologyMedical Biotechnology• Diagnostics• Therapeutics• Vaccines
AgriculturalBiotechnology• Plant agriculture• farms• Food processing
EnvironmentalBiotechnology• Cleaning through
bioremediation• Preventing
environmentalproblems
Forensic Biotechnology• Paternity test• Scientific
investigations
Industrial Biotechnology• Energy production• New materials
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APPLICATIONS OF BIOTECHNOLOGY
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Some tools of biotechnologyRecombinant DNA technologyGene TherapyCloningMonoclonal Antibodies’productionStem cellsPCRDNA fingerprintDNA sequencingIn vitro fertilization……AND MORE!!!!
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Recombinant DNA technologyRecombinant DNA technology is one of the recent advances in
biotechnology, which was developed by two scientists named
Boyer and Cohen in 1973.
Recombinant DNA technology works by taking DNA from two
different sources and combining that DNA into a single molecule.
That alone, however, will not do much. Recombinant DNA
technology only becomes useful when that artificially-created
DNA is reproduced. This is known as DNA cloning.
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What’s recombinant DNA?RECOMBINANT DNA : is a DNA molecule that has been made
in the laboratory using at least two different sources of DNA
Recombinant DNA is produced using in vitro molecular
techniques to isolate and manipulate fragments of DNA
?
To produce Recombinat DNA you need
Molecular scissors: Restriction enzyme
Molecular glue: Ligasi enzyme
A vector:Plasmide, viruses,
etc
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Restriction enzymesEnzymes that cleave DNA are used to manipulate and recombine
DNA.
Restriction enzymes, naturally used by bacteria as defense against
bacteriophages, cut DNA into smaller pieces.
Restriction enzymes cut DNA at
specific base sequences called
restriction site.
CUT=CLEAVE
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Restriction enzymesSome restriction
enzymes
recognise and
cut palindromic
DNA sequences
(sequences that
read the same
way in both
directions).
Some of them
make staggered
cuts, generating
fragments with
sticky ends
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Restriction enzymes
Sticky ends
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Enzyme ligaseThe sticky ends may join: a fragment from one source, such as human, canbe joined to a fragment from another source, such as bacterium. Initiallythe fragments are held together only by weak hydrogen bonds: for thesereason you use the enzyme ligase to catalyze the formation of covalentbonds between adjacent nucleotides at the ends of the fragments, joiningthem to form a single, larger molecule
They join
ligase
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Enzyme ligase
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PlasmidsA plasmid is a small DNA molecule within a cell that is physically separatedfrom a chromosomal DNA and can replicate independently. They are mostcommonly found in bacteria as small, circular, DNA molecules• Plasmids are naturally exchanged among organisms• They can be modified and used to deliver new pieces of DNA into anorganism=VECTORThey often contain genes for antibiotic resistance
http://education-portal.com/academy/lesson/what-is-a-dna-plasmid-importance-to-genetic-engineering.html#lesson
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Six steps of recombinant DNA technology
1. Isolating (vector andtarget gene)
2. Cutting (Cleavage)
3. Joining (Ligation)
6. Selecting (Screening)
5. Cloning
2
3
1
4
4. Transformation(Introduction of the plasmid intocells) 5
6
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Six steps of recombinant DNA technology
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Screening
ampicilline resistance gene
lacZ gene
unfunctioning lacZ gene
human gene
Plate out the transformedbacteria on a solid nutrientmedium containing ampicillinand a sugar called X-gal.
Only transformedbacteria that havethe ampicillin-resistance plasmidwill grow.
This bacterium express lacZgene, willhidrolyse sugar and form BLUE colony
This bacterium DOESN’T express lacZgene, it isn’t able to hidrolyse sugar, will form WHITE colony: it’s a GMO with useful external gene
Repotergenes or marker genes
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Screening
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Production of insulin in the pastType I diabetes mellitus is a metabolic diseasecaused by lack of hormone insulin.It’s treatable only with injection
In the past, insulin was taken from the pancreasesof cows and pigs. The method was expensive andsome patients had severe allergic reaction to theforeign insulin or its contaminants
these problemshave beenovercome thanksto a GMO
http://education-portal.com/academy/lesson/what-is-genetic-engineering-definition-and-examples.html
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Production of insulin with recombinat DNA technology
simplifiedversion
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Production of insulin with recombinat DNA technology
Correctversion
Two genes are chenically synthesized, onefor the insulin A chain and one for theInsulin B chain.Plasmid are extracted from Escherichiacoli. To make the bacteria produce insulin,the insulin gene must be linked to thebeta-galactosidase gene, which carries apromoter for tanscription.The recombinant plasmids are insertedback into bacteria, these bacteriareproduce so that Insulin gene are cloned.The GMO bacteria produce the two Insulinchains that are extracted, purufied andmixed together .The A and B insulin chains conncet viadisulfade cross linkages to form thefunctional insulin protein
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Animals are genetically engineered to exalt specific traits or
obtain useful products:
•GM animals can produce pharmaceuticals
•GM mice are bred for human disease research
•Xenotransplantation (animals as organs donor in
transplantation)
Genetically modified animals
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Genetically modified animals
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Genetically modified animals
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UNIT 2CONTENTS
• Biotecchnology in medicine: production of drugs
• Monoclonal antibodies• Stem cells (blended
learning)• Gene therapy
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TPA is a naturally occuring human protein
that dissolves blood clots. It’used to treatpatients suffering from blood clotting in heartattack or strokes
Production of drugs
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Production of drugs
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Production of drugs with pharming
An expression vector
carrying a desired gene can
be put into an animal
fertilized egg (embryo),
which is implanted into a
surrogate mother. The
transgenic offspring
produce the new protein in
their milk. The milk is easily
harvested and the protein
isolated, purified, and made
clinically available to
patients.
Another way of making medically useful products in large amount is
pharming: the production of pharmaceuticals in farm animals or plants
2. The human transgene is injectedinto the Fertilized eggs
3. Eggs are transferred to recipient ewes
1. Donor ewes: afterinsemination, fertilized eggs are collected
4. The offspringare raised-selection of animalsproducing the human protein in the milk
Ewe=female sheep
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Production of drugs with pharming
• Human growth hormone (forchildren suffering deficiencies) cannow be produced by transgeniccows.
• Only 15 such cows are needed tosupply all the children in the worldsuffering from this type ofdwarfism.
transgenic animals are not well seen by the public, and yet ....
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Monoclonal antibodies
https://www.youtube.com/watch?v=Qp0z3bZDfKE
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Use of Monoclonal antibodies
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Use of Monoclonal antibodies
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ADC: monoclonal antibodies drug conjugated
https://www.youtube.com/watch?v=ACxmsMmo9hU
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Production of vaccinesTypes of Vaccine
Whole-Agent Vaccine: Contains whole, non virulent microorganisms
Subunit vaccine: Contains some partor product of microrganisms that canproduce an immune response
ProblemsThese microrganisms can back-mutate to a virulent formAllergic reactions (e.g. against eggsubstrate used to grow viruses)
They can be produced withbiotechnology, they are safer thanattenuated vaccines because theycan’t reproduce and they containlittle or no extra material (no allergicreactions)
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Production of recombinant vaccines
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Production of vaccines
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Gene TherapyGene therapy is an experimental technique for treating disease by altering the patient'sgenetic material. Most often, gene therapy works by introducing a healthy copy of adefective gene into the patient's cells.
Researchers must find safe, efficient vehicles--called vectors--to carry the modified DNA to targeted cells. There are several vectors already in use, including chemical solutions, synthetic fat molecules, and viruses that have been modified so that they are harmless.
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Gene TherapyGene therapy may be classified into the two following types, only one of which has been used in humans:
Somatic gene therapyAs the name suggests, in somatic genetherapy, the therapeutic genes aretransferred into the somatic cells (non sex-cells), or body, of a patient. Anymodifications and effects will be restrictedto the individual patient only, and will notbe inherited by the patient's offspring orlater generations
Germline gene therapyIn germline gene therapy, germcells (sperm or eggs) are modified by theintroduction of functional genes, whichare integrated into their genomes. Germcells will combine to form a zygote whichwill divide to produce all the other cellsin an organism and therefore if a germcell is genetically modified then all thecells in the organism will contain themodified gene. This would allow thetherapy to be heritable and passed on tolater generations
technical and ethicalproblems=eugenics
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Gene Therapy
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Gene Therapy to treat SCID
A form of SCID is caused by a deficiency of an enzyme (adenosine deaminase or ADA), which is necessary for lymphocytes to develop.
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http://learn.genetics.utah.edu/content/genetherapy/gtdoctor/
Space DoctorWelcome to the Extraterrestrial Gene Therapy Lab! As Space Doctor, you'll use your gene therapy knowledge to treat three ailing aliens who come into your clinic.
A bit of fun…with gene therapy
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Stem cells
https://www.youtube.com/watch?v=2-3J6JGN-_Y
ESL VIDEO: A Stem Cell Story Quick Quiz
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UNIT 3• Pro and cons of biotechnology
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PRO: advantages of GMOsInsect ResistanceSome GMO foods have been modified to make them more resistant to insect pests.The University of California in San Diego reports that a toxic bacterium can be addedto crops to make them insect repellent, yet safe for human use. This can reduce theamount of pesticide chemicals used on the plants, thus potentially reducingexposure to pesticides.
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PRO: advantages of GMOs
More Nutritious FoodsThe Food and Agricultural Organization of the United Nations reports that someGMO foods have been engineered to be more nutritious in terms of mineral orvitamin content. Not only does this help you get the nutrients you need, it can alsoplay a significant role in battling malnutrition in the developing world. The UnitedNations advises that vitamin A-enhanced rice is helping to reduce global vitamin Adeficiencies.
Golden rice
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PRO: advantages of GMOs
More Nutritious Foods
Genetically-modified purple tomatoes : Their dark pigment is intended to givetomatoes the same potential health benefits as fruit such as blueberries.
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PRO: advantages of GMOs
More resistant plant•Cold tolerance An antifreeze
gene from cold water fish has beenintroduced into plants such as tobaccoand potato. With this antifreeze gene,these plants are able to tolerate coldtemperatures that normally would killunmodified seedlings.
•Drought tolerance/salinitytolerance Creating plants that can
withstand long periods of drought orhigh salt content in soil andgroundwater will help people to growcrops in formerly inhospitable places
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tomatoes long conservation
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Edible vaccinesPlants enginereed to contain the vaccine can be grown locally, in the area wherevaccination in required, overcoming the logistic and economic problems oftransporting prepared vaccines over long distances. Most immportantly, ediblevaccines do not require syringes, saving money and eliminating the risk ofinfection from contamined needles.
PRO: advantages of GMOs
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BioremediationPRO: advantages of GMOs
GM bacteria can clean up oil contamination repidly and effectly, but can youthink about the effect caused by the uncontrolled spread of these GM bacteria?
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consumers are the guinea pigs?
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CONS: problems with GMOs
Allergic ReactionsGMO foods can present significant allergy risks to people. Genetic modification oftenmixes or adds proteins that weren't indigenous to the original plant or animal, causingnew allergic reactions in the human body. In some cases, proteins from an organism thatyou're allergic to may be added to an organism that you weren't originally allergic to,prompting the same allergic reaction experienced from the first organism.
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CONS: problems with GMOs
Possible «escape» of transgene from crops to other species
Gene TransferA constant risk of GMO foods is that the modified genes of the organisms may escape into the wild. Brown University warns that herbicide-resistant genes from commercial crops may cross into the wild weed population, thus creating "superweeds" that are impossible to kill with herbicides
More than tenresistant weedspecies have
appeared in the U.S
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CONS: problems with GMOs
Gene TransferA related risk is that the escape of genetically enhanced animals and vegetation cancreate new super-organisms that can out-compete natural animal and plantpopulations to drive certain species into extinction.
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CONS: problems with GMOs
some crop are genetically modified to resist herbicides, this encourages extensive use of herbicides. Another negative impact is the possibility that increased us of an herbicide will select for weeds with naturally mutations that make them resistant to that herbicide (such as glycofosfate)
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CONS: problems with GMOs
Economic concernsBringing a GM food to market is a lengthy and costly process, and of course agri-biotechcompanies wish to ensure a profitable return on their investment. Many new plant genetic
engineering technologies and GM plants have been patented, and patent infringement is abig concern of agribusiness. Yet consumer advocates are worried that patenting these newplant varieties will raise the price of seeds so high that small farmers and third worldcountries will not be able to afford seeds for GM crops, thus widening the gap between thewealthy and the poor
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CONS: problems with GMOs
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CONS: problems with GMOs
Ethical issues
See-Through Frog.
GMO Bulls
GM animals may suffer poor health and reduced life span
Bald Chickens
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