Large-scale DNA sequencing for comparative systems biology

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We performed cDNA analysis of the nematode C.elegans thouroughly. ESTs of about 150,000 full-length cDNA clones that had been made by the V-capping method were obtained to produce 4,909 new cDNA species. Altogether 11,309 cDNA species have been analysed for their expression patterns by the whole mount in situ hybridization. The mRNAs for the cDNA libraries were analysed by the next generation DNA sequencer to obtain the whole transriptome information. These data were integrated in NEXTDB, which were linked with the C.elegans central database WormBase. As to the studies for gene expression regulation network, we identified 1) the stage-specific cis-regulatory sequences and their trans-factors in the early intestine lineage, and 2) the regulatory sequence for the expression in the thermo-sensory neuron AFD and its ragulatory genes. As to the studies for mRNA localization mechanisms, we identified 1) cis-element in its 3`-UTR for pos-1 mRNA localization and its trans-factor, and 2) cis-element for mex-3 mRNA localization. We developed a semi-automatic system for the creation of cell shape models in C. elegans embryogenesis. We carried out whole genome sequencing of a nematode D. cronatus by the hybrid method using the Sanger method and the new generation sequencer.