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1 Department of Molecular and Human Genetics,
2 Graduate Program in Developmental Biology,
3 Department of Biochemistry and Molecular Biology,
4 DNA Array Core Facility,
5 Department of PM&R and Division of Neuroscience, Baylor College of Medicine, Houston TX 77030, USA
6 Institute of Biological Sciences, University of Tsukuba, Tsukuba, Japan
7 Division of Biological Sciences, Hokkaido University, Sapporo, Japan
8 Department of Biology, Osaka University, Osaka, Japan
9 Novartis Foundation for the Promotion of Science, Takarazuka, Japan
* These authors contributed equally to this work
Author for correspondence (e-mail: gadi{at}bcm.tmc.edu)
Accepted 9 January 2002
A distinct feature of development in the simple eukaryote Dictyostelium discoideum is an aggregative transition from a unicellular to a multicellular phase. Using genome-wide transcriptional analysis we show that this transition is accompanied by a dramatic change in the expression of more than 25% of the genes in the genome. We also show that the transcription patterns of these genes are not sensitive to the strain or the nutritional history, indicating that Dictyostelium development is a robust physiological process that is accompanied by stereotypical transcriptional events. Analysis of the two differentiated cell types, spores and stalk cells, and their precursors revealed a large number of differentially expressed genes as well as unexpected patterns of gene expression, which shed new light on the timing and possible mechanisms of cell-type divergence. Our findings provide new perspectives on the complexity of the developmental program and the fraction of the genome that is regulated during development.
Supplemental data available on-line
Key words: DNA microarray, Gene expression, Functional genomics, Dictyostelium discoideum
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