1. Expression Mural Visualizing Microarray Gene Expression Data
Matt Clement, Margaret Ellis, Josh Steele, Yuying Tian
Department of Computer Science, Virginia Tech

2. Introduction

3. Data Files
extract
Text File
parse

4. Data Files number of chromosomes: 16
largest chromosome: 1,531,929 base pairs
length of sequences: 300 – 4,000 base pairs
sequences per experiment: 5,000 – 10,000
data fields per experiment: 70

5. Data Structure
sequences
chromosome
tier array X1 X2 X4 X8

6. Hurdles Domain knowledge Data Management Java inexperience
Each pixel represents many base pairs
,000 bp/pixel
Calculating average ratios
average(0.2, 5.0) = 1
Gene sequence overlapping
Java inexperience

7. Future Work Mouse over Bounding boxes Rearrange order Link to more
information
Usability
testing
Histograms
Generic input

8. Acknowledgments Computer Science Department: Dr. Chris North
Dr. Lenwood Heath
Dr. Craig Struble
Virginia Bioinformatics Institute:
Dr. Jennifer Weller
Dr. Allan W. Dickerman
Virginia-Maryland Regional College
of Veterinary Medicine:
Dr. Stephen M. Boyle