Abstract
A fine physical map of the rice (Oryza sativa spp. Japonica var. Nipponbare) chromosome 5 with bacterial artificial chromosome (BAC) and PI-derived artificial chromosome (PAC) clones was constructed through integration of 280 sequenced BAC/PAC clones and 232 sequence tagged site/expressed sequence tag markers with the use of fingerprinted contig data of the Nipponbare genome. This map consists of five contigs covering 99% of the estimated chromosome size (30.08 Mb). The four physical gaps were estimated at 30 and 20 kb for gaps 1–3 and gap 4, respectively. We have submitted 42.2-Mb sequences with 29.8 Mb of nonoverlapping sequences to public databases. BAC clones corresponding to telomere and centromere regions were confirmed by BAC-fluorescence in situ hybridization (FISH) on a pachytene chromosome. The genetically centromeric region at 54.6 cM was covered by a minimum tiling path spanning 2.1 Mb with no physical gaps. The precise position of the centromere was revealed by using three overlapping BAC/PACs for ~150 kb. In addition, FISH results revealed uneven chromatin condensation around the centromeric region at the pachytene stage. This map is of use for positional cloning and further characterization of the rice functional genomics.
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Acknowledgments
We thank Ming-Ru Liou for assisting the experiment of screening of fosmid library, and Yao-Cheng Lin for preparing the Figure S2 and the analysis of Cent O repeats. This work was supported by Academia Sinica, the National Science Council, and the Council of Agriculture, Taipei, Taiwan.
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Communicated by R. Hagemann
Chia-Hsiung Cheng and Mei-Chu Chung have equal contributions.
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Cheng, CH., Chung, MC., Liu, SM. et al. A fine physical map of the rice chromosome 5. Mol Genet Genomics 274, 337–345 (2005). https://doi.org/10.1007/s00438-005-0039-y
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DOI: https://doi.org/10.1007/s00438-005-0039-y