Genetics, Vol. 158, 1711-1724, August 2001, Copyright © 2001

Bacterial Artificial Chromosome-Based Physical Map of the Rice Genome Constructed by Restriction Fingerprint Analysis

Quanzhou Taoa, Yueh-Long Changa, Jingzhao Wanga,b, Huaming Chena, M. Nurul Islam-Faridia, Chantel Scheuringa, Bin Wangb, David M. Stellya, and Hong-Bin Zhanga
a Department of Soil and Crop Sciences and Crop Biotechnology Center, Texas A&M University, College Station, TX 77843-2123
b Institute of Genetics, Chinese Academy of Sciences, Beijing 100101, People's Republic of China

Corresponding author: Hong-Bin Zhang, Department of Soil and Crop Sciences and Crop Biotechnology Center, 2123 TAMUS, Texas A&M University, College Station, TX 77843-2123., hbz7049{at}pop.tamu.edu (E-mail)

Communicating editor: Z-B. ZENG

Genome-wide physical mapping with bacteria-based large-insert clones (e.g., BACs, PACs, and PBCs) promises to revolutionize genomics of large, complex genomes. To accelerate rice and other grass species genome research, we developed a genome-wide BAC-based map of the rice genome. The map consists of 298 BAC contigs and covers 419 Mb of the 430-Mb rice genome. Subsequent analysis indicated that the contigs constituting the map are accurate and reliable. Particularly important to proficiency were (1) a high-resolution, high-throughput DNA sequencing gel-based electrophoretic method for BAC fingerprinting, (2) the use of several complementary large-insert BAC libraries, and (3) computer-aided contig assembly. It has been demonstrated that the fingerprinting method is not significantly influenced by repeated sequences, genome size, and genome complexity. Use of several complementary libraries developed with different restriction enzymes minimized the "gaps" in the physical map. In contrast to previous estimates, a clonal coverage of 6.0–8.0 genome equivalents seems to be sufficient for development of a genome-wide physical map of ~95% genome coverage. This study indicates that genome-wide BAC-based physical maps can be developed quickly and economically for a variety of plant and animal species by restriction fingerprint analysis via DNA sequencing gel-based electrophoresis.




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