Feb 6, 2004

Chromosome termini of the monocot plant Othocallis siberica are maintained by telomerase, which specifically synthesises vertebrate-type telomere sequences

The Plant Journal : for Cell and Molecular Biology
Hanna Weiss-SchneeweissDieter Schweizer


Lack of Arabidopsis-type T3AG3 telomere sequences has recently been reported for the majority of investigated taxa of the monocot order Asparagales. In order to investigate this phenomenon in more detail, we conducted extensive cytogenetic and molecular analyses of the telomeres in Othocallis siberica, a member of this order. Terminal restriction fragment analysis together with Bal31 exonuclease assay showed that chromosome termini in O. siberica are formed by long stretches (more than 10 kbp) of vertebrate-type T2AG3 repeats. In addition, telomerase activity specifically synthesising (T2AG3)n sequence was detected in O. siberica protein extracts by telomerase repeat amplification protocol (TRAP). Fluorescence in situ hybridisation (FISH) revealed the presence of the vertebrate-type T2AG3 telomere sequences at all chromosome termini and at a few additional regions of O. siberica chromosomes, whereas Arabidopsis-type T3AG3 DNA and peptide nucleic acid (PNA) probes did not hybridise to chromosomes of Othocallis, except for polymorphic blocks in chromosomes 2 (interstitial) and 4 (terminal). These interstitial/terminal regions are apparently composed of large blocks of (T2AG3)n and (T3AG3)n DNA and represent a unique example of in...Continue Reading

  • References42
  • Citations21


  • References42
  • Citations21


Mentioned in this Paper

Peptide Nucleic Acids
Fluorescent in Situ Hybridization
Restriction Fragment Length Polymorphism
Telomerase Catalytic Subunit
Cauliflower (Dietary)
Selfish DNA

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