Abstract
A number of X chromosome DNA sequences have been isolated from a dioecious plant, Melandrium album (syn. Silene latifolia),using chromosome microdissection followed by degenerate oligonucleotide-primed polymerase chain reaction (DOP–PCR) amplification. Six DNA clones were selected and further characterized by DNA/DNA hybridization techniques to check their copy numbers, sex-specific methylation patterns, species specificity and positions on chromosomes. These clones were moderately to highly repetitive (approximately 103–105 copies per haploid genome) and none of them gave a positive signal on Northern blots. One of the clones yielded a sex-specific methylation pattern: its abundant non-methylated CCGG island was found only in males. All the clones also hybridized to two closely related dioecious Melandrium species (M. rubrum and M. dicline). Nucleotide sequences of two X-derived clones showed a number of internal short direct repeats; one of them strikingly resembled a plant conservative telomere sequence (TTTAGGG).None of the clones hybridized to the X chromosome only, but all were localized at the telomeric heterochromatic regions (DAPI C-bands) of both arms of a vast majority of M. album chromosomes using the fluorescencein situ hybridization (FISH) technique. However, the non-homologousarm of the Y chromosome (contrary to the arm homologous to the X chromosome,possessing the pseudoautosomal region) showed neither a DAPI C-banding-stained heterochromatin nor a FISH signal with any of the DNA probes tested,thus indicating its evolutionary diversification.
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Bůžek, J., Koutníková, H., Houben, A. et al. Isolation and characterization of X chromosome-derived DNA sequences from a dioecious plant Melandrium album. Chromosome Res 5, 57–65 (1997). https://doi.org/10.1023/A:1011693603279
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DOI: https://doi.org/10.1023/A:1011693603279