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Unformatted text preview: 1 Bring laptop with wireless access to lab this week DNA Technology: population genetics and forensic applications DNA sequencing Multiplex PCR Forensic DNA markers: short tandem repeats Random match probability Paternity index determination- Each of the four ddNTP is labeled with a different ¡uorescent color- Reaction tube has all ingredients including low quantity of ddNTP- Fragments terminated randomly during elongation - Color of each fragment indicates base at which termination occurs Fluorescent sequence printout BLAST Exercise Courtesy of Erica Larson Dimeric repeat Trimeric repeat Tetrameric repeat Microsatellites Satellite DNA: repetitive DNA sequence showing different density after centrifugation 2 Short Tandem Repeat (STR)- Is sets of short, repeating DNA sequences- Repeat unit can range from 2 to 8 nucleotides- Sequences do not code for proteins- Selective neutral- Evolved probably due to replication error- Each locus has a variety of alleles found in the population e.g., TH01: Repeating unit “AATG” ranges from 4 to 11 times in human population Short Tandem Repeat (STR) as Marker GCGAAGTTCCG AATGAATGAATGAATGAATGAATGAATG CCGCATT 7 repeats !! More than 20 loci are routinely used in forensics Feld. D5 and CS¡1PO physically linked but not genetically linked CODIS = Combined DNA Index System Marker region Polymerase Chain Reaction selects a portion of genome to make copies DNA An in vitro reaction (cell-free) Required materials - template: the DNA sequence to be copied- dNTPs (dATP, dGTP, dCTP, and dTTP) as building blocks- primers: short DNA sequences (19-33 bases in STRs) complementary to the template to start the reaction...
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This note was uploaded on 03/13/2010 for the course BIOG 1102 taught by Professor Robertturgeo during the Spring '10 term at Cornell.
- Spring '10