Rice genomics: current status of genome sequencing.

Since its establishment in 1991, the Rice Genome Research Program (RGP) has produced some basic tools for rice genome analysis, including a cDNA catalogue, a genetic linkage map and a yeast artificial chromosome (YAC)-based physical map. For the further development of rice genomics, RGP launched in 1998 an international collaborative project on rice genome sequencing. A P1-derived artificial chromosome (PAC)-based, sequence-ready physical map has been constructed using the PCR markers from cDNA sequences (expressed sequence tag [EST] markers). Selected PAC clones with 100-150 kb inserts from chromosomes 1 and 6 have been subjected to shotgun sequencing. The assembled genomic sequences, after predicting the gene-coding region, have been published both through a public database and through our website. As of January 2000, 1.9 Mb from 13 PAC clones were published. Future prospects for understanding rice genomic information at the nucleotide level are discussed.

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