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We have produced a draft sequence of the rice genome for the most
widely cultivated subspecies in China, Oryza sativa L. ssp.indica, by whole-genome shotgun sequencing. The genome was
466megabases in size, with an estimated 46,022 to 55,615 genes.
Functionalcoverage in the assembled sequences was 92.0%. About 42.2%
ofthe genome was in exact 20-nucleotide oligomer repeats, and mostof
the transposons were in the intergenic regions between genes.Although
80.6% of predicted Arabidopsis thaliana genes had a homologin rice, only 49.4% of predicted rice genes had a homolog in A.thaliana. The large proportion of rice genes with no recognizablehomologs is due to a gradient in the GC content of rice codingsequences.
1 Beijing Genomics Institute/Center of Genomics
and Bioinformatics, Chinese Academy of Sciences, Beijing 101300, China.
2 Hangzhou Genomics Institute-Institute of
Bioinformatics of Zhejiang University-Key Laboratory of Bioinformatics
of Zhejiang Province, Hangzhou 310007, China.
3 Institute of Genetics, Chinese Academy of
Sciences, Beijing 100101, China.
4 University of
Washington Genome Center, Department of Medicine, Seattle, WA 98195, USA.
5 College of Life Sciences, Peking University,
Beijing 100871, China.
6 Medical College, Xi'an
Jiaotong University, Xi'an 710061, China.
7 Fudan
University, Shanghai 200433, China.
8 National
Hybrid Rice R&D Center, Changsha 410125, China.
9 Laboratory of Bioinformatics, Institute of
Biophysics, Chinese Academy of Sciences, Beijing 100101, China.
10 Institute of Theoretical Physics, Chinese
Academy of Sciences, Beijing 100080, China.
11 Digital China Ltd., Beijing 100080, China.
12 Institute of Computing Technology, Chinese
Academy of Sciences, Beijing 100080, China.
*
These authors contributed equally to this work.
To whom correspondence should be addressed. E-mail:
hyang{at}genomics.org.cn.
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