TileMap: create chromosomal map of tiling array hybridizations.
BACKGROUND
Tiling array is a new type of microarray that can be used to survey genomic transcriptional activities and transcription factor binding sites at high resolution. The goal of this paper is to develop effective statistical tools to identify genomic loci that show transcriptional or protein binding patterns of interest.


RESULTS
A two-step approach is proposed and is implemented in TileMap. In the first step, a test-statistic is computed for each probe based on a hierarchical empirical Bayes model. In the second step, the test-statistics of probes within a genomic region are used to infer whether the region is of interest or not. Hierarchical empirical Bayes model shrinks variance estimates and increases sensitivity of the analysis. It allows complex multiple sample comparisons that are essential for the study of temporal and spatial patterns of hybridization across different experimental conditions. Neighboring probes are combined through a moving average method (MA) or a hidden Markov model (HMM). Unbalanced mixture subtraction is proposed to provide approximate estimates of false discovery rate for MA and model parameters for HMM.


BACKGROUND
TileMap is freely available at http://biogibbs.stanford.edu/~jihk/TileMap/index.htm.


BACKGROUND
http://biogibbs.stanford.edu/~jihk/TileMap/index.htm (includes coloured versions of all figures).
Ji
Hongkai
H
Department of Statistics, Harvard University, Cambridge, MA 02138, USA.
Wong
Wing Hung
WH
D000465:Algorithms; D001499:Bayes Theorem; D047369:Chromatin Immunoprecipitation; D002874:Chromosome Mapping; D019295:Computational Biology / Q000379:methods*; D020869:Gene Expression Profiling; D016158:Genes, p53; D016678:Genome; D006824:Hybridization, Genetic; D020407:Internet; D008390:Markov Chains; D008957:Models, Genetic; D009154:Mutation; D009693:Nucleic Acid Hybridization; D020411:Oligonucleotide Array Sequence Analysis / Q000379:methods*; D012680:Sensitivity and Specificity; D012984:Software; D013997:Time Factors; D014158:Transcription, Genetic; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism
D016159:Tumor Suppressor Protein p53