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- W2076969417 abstract "Fluorescent in situ hybridization, C-banding/DAPI, and CMA<sub>3</sub>-fluorescence were performed to reveal the cytomolecular constitution of the standard (A) and supernumerary (B) chromosomes of an autotetraploid <i>Tradescantia virginiana</i> L. The analyses show that translocations and/or inversions have occurred during the evolution of the <i>T. virginiana</i> karyotype, generating a significant level of structural heterozygosity. Regarding the structural level, the present paper confirms the occurrence of small subterminal duplications and/or inversions in <i>T. virginiana</i> already suggested by previous authors. Interestingly, many of the distal chromosome segments in <i>T. virginiana</i> possess duplicated subterminal telomere clusters, heterochromatin, 5S and 45S rDNAs orderly intermixed and share this complex cytomolecular architecture with the common type of a B chromosome. Based on the obtained results, it is proposed that in <i>T. virginiana</i> the B chromosome may have arisen via excision from the distal region of an A chromosome. The nascent B could have retained much of the ancestral sequence arrangement, including duplicated telomeric cluster(s), heterochromatin and rDNA, but developed a new centromere/kinetochore to successfully propagate through the cell cycle." @default.
- W2076969417 created "2016-06-24" @default.
- W2076969417 creator A5076707922 @default.
- W2076969417 date "2011-01-01" @default.
- W2076969417 modified "2023-09-23" @default.
- W2076969417 title "Structural Heterozygosity, Duplication of Telomeric (TTTAGGG)<sub>n</sub> Clusters and B Chromosome Architecture in <i>Tradescantia</i> <i>virginiana</i> L." @default.
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- W2076969417 doi "https://doi.org/10.1159/000328915" @default.
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