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Two tandemly repeated telomere-associated sequences in Nicotiana plumbaginifolia

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Abstract

Two tandemly repeated telomere-associated sequences, NP3R and NP4R, have been isolated from Nicotiana plumbaginifolia. The length of a repeating unit for NP3R and NP4R is 165 and 180 nucleotides respectively. The abundance of NP3R, NP4R and telomeric repeats is, respectively, 8.4 × 104, 6 × 103 and 1.5 × 106 copies per haploid genome of N. plumbaginifolia. Fluorescence in situ hybridization revealed that NP3R is located at the ends and/or in interstitial regions of all 10 chromosomes and NP4R on the terminal regions of three chromosomes in the haploid genome of N. plumbaginifolia. Sequence homology search revealed that not only are NP3R and NP4R homologous to HRS60 and GRS, respectively, two tandem repeats isolated from N. tabacum, but that NP3R and NP4R are also related to each other, suggesting that they originated from a common ancestral sequence. The role of these repeated sequences in chromosome healing is discussed based on the observation that two to three copies of a telomere-similar sequence were present in each repeating unit of NP3R and NP4R.

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Authors and Affiliations

  1. Institute of Botany, Academia Sinica, Taipei, Taiwan, Republic of China

    Chung-Mong Chen & Chi-Ting Wang

  2. Department of Botany, National Taiwan University, Taipei, Taiwan, Republic of China

    Chung-Ju Wang, Yen-Yu Kao & Chi-Chang Chen

  3. Institute of Biochemical Sciences, National Taiwan University, Taipei, Taiwan, Republic of China

    Chia-Hsing Ho

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  1. Chung-Mong Chen
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  2. Chi-Ting Wang
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  3. Chung-Ju Wang
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  4. Chia-Hsing Ho
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Chen, CM., Wang, CT., Wang, CJ. et al. Two tandemly repeated telomere-associated sequences in Nicotiana plumbaginifolia. Chromosome Res 5, 561–568 (1997). https://doi.org/10.1023/A:1018449920968

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