The genome of the flowering plant Arabidopsis thaliana has five chromosomes1,2. Here we report the sequence of the largest, chromosome 1, in two contigs of around 14.2 and 14.6 megabases. The contigs extend from the telomeres to the centromeric borders, regions rich in transposons, retrotransposons and repetitive elements such as the 180-base-pair repeat. The chromosome represents 25% of the genome and contains about 6,850 open reading frames, 236 transfer RNAs (tRNAs) and 12 small nuclear RNAs. There are two clusters of tRNA genes at different places on the chromosome. One consists of 27 tRNAPro genes and the other contains 27 tandem repeats of tRNATyr-tRNATyr-tRNASergenes. Chromosome 1 contains about 300 gene families with clustered duplications. There are also many repeat elements, representing 8% of the sequence.
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We thank K. Mayer and H. Schoof of MIPS for discussions; S. Rhee and E. Huala of TAIR for sequences for the RI markers; and R. Wells for editing the manuscript. This work was funded by National Science Foundation/US Department of Energy/US Department of Agriculture (NSF/DOE/USDA) grants to the SPP Consortium and TIGR.
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