wednesday 4/9/14 aim: how is dna useful to forensic science? do now: list at least 4 sources of dna...
TRANSCRIPT
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Wednesday 4/9/14
• AIM: How is DNA useful to forensic science?• DO NOW: List at least 4 sources of DNA that
could be extracted from a crime scene• HOMEWORK: Text read pages 343-348.
questions 9-11 pages364-365
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DNA: deoxyribonucleic acid
• It is a polymer• Big molecule made of
repeating subunits• DNA is a chain of
Nucleotides • a nucleotides is made of
three parts: a phosphate, a nitrogenous base, and a 5 carbon sugar.
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Forensic source of DNA
• Blood and bodily fluids are the most common sources
• Which part of blood gives us DNA?• Leokocytes: White blood cells• A single drop of blood may contain 7,000 to
25,000 white blood cells• DNA fingerprint or profile
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DNA fingerprint
• Identify the potential suspect• Clear wrongfully suspected person• Identify crime and victims• Establish paternity and family relationships• Match organ donors
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Wednesday 4/9/14
• AIM: How is DNA manipulated in the Forensics lab?
• DONOW: Explain how you would separate a blood sample to extract DNA
• HW: Page 364 q 1-3• Last night was 9-11
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Preparing DNA for analysis
• Isolate or remove DNA from sample ex: skin, clothing, weapon
• Extract DNA from the cells (centrifuge)• Enzymes are then used to isolate DNA from
chromosome• Enzyme: protein catalyst: causes a chemical
reaction that may not ordinarily take place
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DNA profiling, testing, typing or genetic fingerprint
• Process that identifies individuals based on their individual DNA
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DNA Fingerprinting Real WorldApplications
• Crime scene
• Human relatedness
• Paternity
• Animal relatedness
• Anthropology studies
• Disease-causing organisms
• Food identification
• Human remains
• Monitoring transplants
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Collect Buccal Cells
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Steps to making a DNA fingerprint
• 1- Extract DNA from cell nucleus• 2- Add restriction enzymes to cut DNA into
pieces• 3- Separate fragments with gel electrophoresis• 4- Make a copy of results using southern blot• 5- add radioactive DNA probe to visualize• 6- visualize fragments and analyze results
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Forensic DNA Fingerprinting: Using Restriction Enzymes
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DNA Fingerprinting
ProceduresDay One
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DNA Digestion
Temperature Why incubate at 37°C?
• Body temperature is optimal for these and most other enzymes
What happens if the temperature is too hot or cool?
• Too hot = enzyme may be denatured (killed)
• Too cool = enzyme activity lowered, requiring
longer digestion time
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DNA Fingerprinting
ProceduresDay Two
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DNA Fingerprinting
ProceduresDay Three
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Electrophoresis Analysis of Stained Gel
Determinerestriction fragmentsizes
• DNA marker
• Measure distance traveled by restriction fragments
• Determine size of DNA fragments
Identify the relatedsamples
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Thursday 4/9/14
• AIM: how are DNA fragments separated?• DO NOW: What is the function of a restriction
enzyme?• 2 minute mystery Big dipper• Homework: Textbook page 365 q 17
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Why would you use restriction enzymes in a forensics lab?
To cut up DNA samples and create a DNA fingerprint to identify a piece of
evidence
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Would you make an arrest based on the evidence below?
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Restriction Fragment Length Polymorphism
• R:Restriction: enzymes are used to cut the DNA
• F-fragments: creates many pieces of DNA• L-length of each fragment varies among
individuals• P-polymorphisms: greek term meaning many
shapes
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Restriction Endonucleases
Also called restriction enzymesCleave or cut DNA
1962: “molecular scissors” discovered in in bacteriaE. coli bacteria have an enzymatic immune system that recognizes and destroys foreign DNA3,000 enzymes have been identified, around 200 have unique properties, many are purified and available commercially
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Pd 3 Friday 4/11/14
• AIM: how can we separate DNA fragments?• DO NOW: how were restriction enzymes first
found?
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Restriction Endonucleases
Recognition sites have symmetry (palindromic)
“Able was I, ere, I saw Elba”
Bam H1 site:5’-GGATCC-3’3’-CCTAGG-5’
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Restriction Enzymes Pt 1 - YouTube
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Enzyme Site Recognition
• Each enzyme digests (cuts) DNA at a specific sequence = restriction site
• Enzymes recognize 4- or 6- base pair, palindromic sequences (eg GAATTC)
Palindrome
Restriction site
Fragment 1 Fragment 2
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5 vs 3 Prime Overhang
• Generates 5 prime overhang
Enzyme cuts
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Common Restriction Enzymes EcoRI
– Eschericha coli– 5 prime overhang
Pstl– Providencia stuartii– 3 prime overhang
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Restriction enzymesEnzyme Sequence cut
BAM HI GGATCC Between G and G
Hae III GGCC Between G and C
Pst I CTGCAG Between A and G
Bgl II AGATCT Between C and T
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Restriction Endonucleases
Restriction enzyme animation
http://www.dnai.org/b/index.html
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NOW WHAT …
Separate the fragments
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Gel electrophoresis
• The standard method for separating DNA fragments is electrophoresis through agarose gels.
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Terms• Agarose is a polysaccharide (carbohydrate) polymer material,
generally extracted from seaweed.
• Gel electrophoresis is a method that uses an electrical current and a gel matrix to separate molecules like DNA and proteins.
• Buffer a solution containing either a weak acid and its salt or a weak base and its salt, which is resistant to changes in pH.
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Agarose Gel Electrophoresis
• Agarose gels must be prepared and run in a buffer containing ions.
• Ions are charged particles (like those found in salt) and are necessary to carry a charge
• A buffer is a substance that resists changes in pH.– It will neutralize a base---make it into water– It will neutalize an acid---make it into water
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Agarose Gel Electrophoresis
• Buffers prevent the pH from changing by reacting with the H+ or OH- products
• Most common buffer used is called TRIS– [tris(hydroxymethyl)aminomethane]
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Agarose Gel Electrophoresis• After RFLP, DNA is applied to
a slab of gelled agarose• The sample is loaded with a
loading buffer—containing dyes and glycerol or sugar
• Electric current is applied across the gel
• DNA is negatively charged (due to PO4)
• Migrates from the negative (black) electrode to the positive (red) electrode
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• Like charges repel• Rate of migration of
DNA through agarose depends on the size of DNA
• Smaller DNA fragments move more quickly
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Friday 4/11/14
• AIM: how can we visualize a DNA fingerprint?• DO NOW: explain how DNA fragments are
separated in a gel electrophoresis
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DO NOW Answer
• Add electric current to the fragmented DNA• The negative current repels the negative DNA• Smaller fragments move faster through the gel• Larger fragments remain close to the top
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Remember
• Restriction enzymes cut and leave a single strand of DNA open for complementary bonding
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Wednesday 4/23/14
• AIM: How can we replicate DNA for further analysis?
• DO NOW: If everyone has the sameA,T,C and G nucleotides, then how are the billions of people different?
• HW: Text read pages 353-355. answer questions 12 and 13 on page 365
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PCR: Polymerase chain reaction
• Copies DNA • used to make many copies of a gene after
isolation• Allows the analysis of short pieces of DNA or
RNA without having to clone it
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Polymerase chain reaction
• Uses a change in temperature• Ingredients– Uses heat resistant bacteria such as
archaebacteria– Sample of DNA with desired gene– 4 different types of individual nucleotides– 2 short sequences of complementary primers
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Steps in PCR
• Step 1: heat DNA at 94 degrees to denature the double helix (break the H bonds between complementary base pairs)
• Step 2: cool the mixture to about 64 degrees and add a DNA primer
• DNA primer: short sequence of nucleotides that is complementary to the gene sequence you want to copy
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• Step 3; heat to 74 degrees add DNA polymerase and A,T,C,G
• DNA polymerase causes complementary base pairing
• This is the step that actually is MAKING or REPLICATING the DNA
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PCR facts
• There are 3 billion letters in the DNA code of each cell
• PCR makes copies of pieces of that code NOT THE WHOLE THING
• It takes 2 minutes for the process to be complete
• It takes 3 hours to make a million copies• PCR requires 50% less DNA than RFLP
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Polymerase Chain Reaction (PCR) - YouTube
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Thursday 4/24/14
• AIM: how does DNA connect a suspect to a crime?
• DO NOW: Why do forensic scientists analyze DNA?
• HOMEOWRK: Text read pages 357-360. answer questions 16-18 pg 365
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DNA Evidence
• DNA evidence-has many uses within the legal system and criminal cases.– Proving someone guilty or
innocent for a crime they have or have not committed.
– Identification
– Paternity Testing
First criminal identification card filedby the NY State Bertillon Bureau
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Criminal Cases
• DNA evidence has exonerated people accused of committing crimes.
• Only about 30% of all DNA tests run by the FBI have exonerated an accused person
• DNA evidence is still not as useful as fingerprinting.
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January 28, 2003Southern Blot
Identification• Used to determine the sex, race, or even name of
unnamed victims of crimes.• Used in military to identify those who have died in battle,
similar to the purpose of dog tags.
Typical dog tags
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January 28, 2003Southern Blot
Paternity Testing• Evidence can be used to compare the DNA of the
suspected parent(s) and that of the child and determine the real parent.
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Southern blot
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General Scheme for Southern Blot
Gel Electrophoresis
DNA Preparation: Denaturation/Depurination
Transfer to filter: Blotting
Detecting DNA: Probing
Restriction Digest
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DNA probe: identify specific genes• Short single strand sequence of
DNA• labeled with a radioactive
isotope, dye, or enzyme • used to locate a particular
nucleotide sequence or gene on a DNA molecule
• Once located,the gene can then be isolated
• Radioactivity of probe produces dark spots on top of genes of interest
•
•
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Forensic history of DNA analysis
• 1986: suspect was exonerated for double rape-murder in england
• 1987: first time DNA ID is used to establish familial relationship between Ghanaise boy and his mother in United Kingdom
• 1994: husband convicted of ex wife murder on Prince Edward Island Canada due to cat hair DNA analysis
• NFL placed synthetic DNA on footballs used in super bowl XXXIV to prevent memorabilia fraud
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The Innocence Project
• 1992• Cardozo School of Law• 314 people exonerated 172 of those cases
were assisted by Innocence Project• After more than 17 years in prison Eddie Joe
Lloyd who was convicted of the rape and murder of a 16 yo girl in Michigan was pardoned and released In August 2002
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CODIS
• Combined DNA Index System• Analyses Short Tandem Repeat (STR)sequences of
DNA– Locations on chromosomes that repeat specific sequence
of 2-10 base pairs• Analyzes Variable number of Tandem repeats (VNTR)– Identifies repeats of 9-80 base pairs
• Forensic scientists scan 13 DNA regions from person to person then create a DNA profile
• CODIS looks at 13 specific STRs
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Assessment
• In your own words explain how DNA analysis is used in our world
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Tuesday 4/22/14
• AIM: how can we connect a suspect to a crime using RFLP and gel electrophoresis?
• DO NOW: How do restriction enzymes work?• What are DNA palindromes?• HOMEWORK:
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Restriction Fragment Length Polymorphisms
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Restriction enzymes
• Recognize specific sequences of DNA and cut them into pieces
• Palindrome: has the same DNA sequence front and back
• EX: GGTACC• CCATGG
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RFLP
• Restriction Fragment Length Poymorphism• It is a process used in the beginning of a DNA
fingerprint• Specifically it cuts DNA into pieces• Each fragment will be separated based on its sized by
the process of gel electrophoresis• Restriction enzymes: recognize specific sequences
called palindromes• Palindrome: same nucleotide sequence front and
back
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Agarose Gel Electrophoresis