Sequencing and characterization of telomere and subtelomere regions on rice chromosomes 1S, 2S, 2L, 6L, 7S, 7L and 8S

The Plant Journal : for Cell and Molecular Biology
Hiroshi MizunoTakashi Matsumoto

Abstract

Telomeres, which are important for chromosome maintenance, are composed of long, repetitive DNA sequences associated with a variety of telomere-binding proteins. We characterized the organization and structure of rice telomeres and adjacent subtelomere regions on the basis of cytogenetic and sequence analyses. The length of the rice telomeres ranged from 5.1 to 10.8 kb, as revealed by both fibre-fluorescent in situ hybridization and terminal restriction-fragment assay. Physical maps of the chromosomal ends were constructed from a fosmid library. This facilitated sequencing of the telomere regions of chromosomes 1S, 2S, 2L, 6L, 7S, 7L and 8S. The resulting sequences contained conserved TTTAGGG telomere repeats, which indicates that the physical maps partly covered the telomere regions of the respective chromosome arms. These repeats were organized in the order of 5'-TTTAGGG-3' from the chromosome-specific region, except in chromosome 7S, in which seven inverted copies also existed in tandem array. Analysis of the telomere-flanking regions revealed the occurrence of deletions, insertions, or chromosome-specific substitutions of single nucleotides within the repeat sequences at the junction between the telomere and subtelomere. Th...Continue Reading

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May 31, 2006·TAG. Theoretical and applied genetics. Theoretische und angewandte Genetik·Masaki FujisawaTakuji Sasaki
Apr 9, 2008·Molecular Genetics and Genomics : MGG·Hiroshi MizunoTakashi Matsumoto
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Jan 25, 2012·The Plant Journal : for Cell and Molecular Biology·Chunhui XuWeichang Yu
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