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GenMAPP and MAPPFinder for Systems Biology Education Kam Dahlquist Vassar College June 12-20, 2004 BioQUEST Summer Workshop Beloit College
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Merged, false color image Green = Cy3 Red = Cy5 Output is ratio of fluoresence intensities Printed Microarray Scott Freeman, Biological Science (2002) Fig. 16.10a
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Redfern et al. (2000) PNAS 97:4826
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Dahlquist et al. (2000) Nature Genetics 31:19
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GenMAPP Demo
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Doniger et al. (2002) Genome Biology 4:R7
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Permute P Value and Adjusted P Value To generate a p value from the Z score, MAPPFinder permutes the data 1000 times and calculates new Z scores from each permutation of the data. This distribution of Z scores is used to calculate the permute p value. Since thousands of p values are being calculated, there is a multiple testing problem. If a p value cut-off of p<0.05 is chosen, 5% of the p values could be “significant” by chance. MAPPFinder performs the Westfall-Young adjustment on the p values to generate the adjusted p which is very stringent.
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MAPPFinder Demo
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Hands-on Exercises Student exercises piloted this year in introductory biology and intermediate genetics courses Intro bio students analyzed a human prostate cancer dataset with MAPPFinder Genetics students analyzed a yeast metabolic timecourse dataset with MAPPFinder and drew the adenine biosynthesis pathway with GenMAPP A dataset comparing gene expression in the heart of a 12.5 day mouse embryo to an adult heart is also available
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Acknowledgments Gladstone Institutes Bruce Conklin Scott Doniger Lynn Ferrante Kristina Hanspers Steven Lawlor Alex Pico Nathan Salomonis Karen Vranizan Alex Zambon www.GenMAPP.org genmapp@gladstone.ucsf.edu Vassar College Meredith Braymer ‘04 Jessica Heckman ‘05 David Koren ’06 Christen Vogel ’04 kadahlquist@vassar.edu
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