Physical maps and recombination frequency of six rice chromosomes

被引:122
作者
Wu, JZ [1 ]
Mizuno, H [1 ]
Hayashi-Tsugane, M [1 ]
Ito, Y [1 ]
Chiden, Y [1 ]
Fujisawa, M [1 ]
Katagiri, S [1 ]
Saji, S [1 ]
Yoshiki, S [1 ]
Karasawa, W [1 ]
Yoshihara, R [1 ]
Hayashi, A [1 ]
Kobayashi, H [1 ]
Ito, K [1 ]
Hamada, M [1 ]
Okamoto, M [1 ]
Ikeno, M [1 ]
Ichikawa, Y [1 ]
Katayose, Y [1 ]
Yano, M [1 ]
Matsumoto, T [1 ]
Sasaki, T [1 ]
机构
[1] Inst Soc Technoinnovat Agr Forestry & Fisheries, Natl Inst Agrobiol Sci, Rice Genome Res Program, Tsukuba, Ibaraki 3058602, Japan
关键词
rice genome; genetic and physical map; centromere; gene density; repetitive sequence;
D O I
10.1046/j.1365-313X.2003.01903.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
We constructed physical maps of rice chromosomes 1, 2, and 6-9 with P1-derived artificial chromosome (PAC) and bacterial artificial chromosome (BAC) clones. These maps, with only 20 gaps, cover more than 97% of the predicted length of the six chromosomes. We submitted a total of 193 Mbp of non-overlapping sequences to public databases. We analyzed the DNA sequences of 1316 genetic markers and six centromere-specific repeats to facilitate characterization of chromosomal recombination frequency and of the genomic composition and structure of the centromeric regions. We found marked changes in the relative recombination rate along the length of each chromosome. Chromosomal recombination at the centromere core and surrounding regions on the six chromosomes was completely suppressed. These regions have a total physical length of about 23 Mbp, corresponding to 11.4% of the entire size of the six chromosomes. Chromosome 6 has the longest quiescent region, with about 5.6 Mbp, followed by chromosome 8, with quiescent region about half this size. Repetitive sequences accounted for at least 40% of the total genomic sequence on the partly sequenced centromeric region of chromosome 1. Rice CentO satellite DNA is arrayed in clusters and is closely associated with the presence of Centromeric Retrotransposon of Rice (CRR)- and RIce RetroElement 7 (RIRE7)-like retroelement sequences. We also detected relatively small coldspot regions outside the centromeric region; their repetitive content and gene density were similar to those of regions with normal recombination rates. Sequence analysis of these regions suggests that either the amount or the organization patterns of repetitive sequences may play a role in the inactivation of recombination.
引用
收藏
页码:720 / 730
页数:11
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