The Cyclohedron Test for Finding Periodic Genes in Time Course Expression Studies
Abstract
The problem of finding periodically expressed genes from time course microarray experiments is at the center of numerous efforts to identify the molecular components of biological clocks. We present a new approach to this problem based on the cyclohedron test, which is a rank test inspired by recent advances in algebraic combinatorics. The test has the advantage of being robust to measurement errors, and can be used to ascertain the significance of top-ranked genes. We apply the test to recently published measurements of gene expression during mouse somitogenesis and find 32 genes that collectively are significant. Among these are previously identified periodic genes involved in the Notch/FGF and Wnt signaling pathways, as well as novel candidate genes that may play a role in regulating the segmentation clock. These results confirm that there are an abundance of exceptionally periodic genes expressed during somitogenesis. The emphasis of this paper is on the statistics and combinatorics that underlie the cyclohedron test and its implementation within a multiple testing framework.
Additional Information
© 2007 by Walter de Gruyter GmbH. We are grateful to Mary-Lee Dequéant and Olivier Pourquié for many helpful discussions, and to Mary-Lee for preparing the data for our use. We thank Oliver Wienand for helping us implement the cyclohedron test. The collaboration was facilitated by the DARPA Fundamental Laws of Biology Program which supported our research. Anne Shiu was supported by a Lucent Technologies Bell Labs Graduate Research Fellowship. We thank an anonymous referee for helpful comments.Attached Files
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Additional details
- Eprint ID
- 74813
- Resolver ID
- CaltechAUTHORS:20170306-154012533
- Defense Advanced Research Projects Agency (DARPA)
- Lucent Technologies Bell Labs
- Created
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2017-03-07Created from EPrint's datestamp field
- Updated
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2021-11-11Created from EPrint's last_modified field