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Elimination and rearrangement of parental rDNA in the allotetraploid Nicotiana tabacum.
Mol Biol Evol 1999; 16(3):311-20MB

Abstract

Origin and rearrangement of ribosomal DNA repeats in natural allotetraploid Nicotiana tabacum are described. Comparative sequence analysis of the intergenic spacer (IGS) regions of Nicotiana tomentosiformis (the paternal diploid progenitor) and Nicotiana sylvestris (the maternal diploid progenitor) showed species-specific molecular features. These markers allowed us to trace the molecular evolution of parental rDNA in the allopolyploid genome of N. tabacum; at least the majority of tobacco rDNA repeats originated from N. tomentosiformis, which endured reconstruction of subrepeated regions in the IGS. We infer that after hybridization of the parental diploid species, rDNA with a longer IGS, donated by N. tomentosiformis, dominated over the rDNA with a shorter IGS from N. sylvestris; the latter was then eliminated from the allopolyploid genome. Thus, repeated sequences in allopolyploid genomes are targets for molecular rearrangement, demonstrating the dynamic nature of allopolyploid genomes.

Authors+Show Affiliations

Department of Cytology and Genetics, University of Vienna, Austria.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Comparative Study
Journal Article
Research Support, Non-U.S. Gov't

Language

eng

PubMed ID

10331258

Citation

Volkov, R A., et al. "Elimination and Rearrangement of Parental rDNA in the Allotetraploid Nicotiana Tabacum." Molecular Biology and Evolution, vol. 16, no. 3, 1999, pp. 311-20.
Volkov RA, Borisjuk NV, Panchuk II, et al. Elimination and rearrangement of parental rDNA in the allotetraploid Nicotiana tabacum. Mol Biol Evol. 1999;16(3):311-20.
Volkov, R. A., Borisjuk, N. V., Panchuk, I. I., Schweizer, D., & Hemleben, V. (1999). Elimination and rearrangement of parental rDNA in the allotetraploid Nicotiana tabacum. Molecular Biology and Evolution, 16(3), pp. 311-20.
Volkov RA, et al. Elimination and Rearrangement of Parental rDNA in the Allotetraploid Nicotiana Tabacum. Mol Biol Evol. 1999;16(3):311-20. PubMed PMID: 10331258.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Elimination and rearrangement of parental rDNA in the allotetraploid Nicotiana tabacum. AU - Volkov,R A, AU - Borisjuk,N V, AU - Panchuk,I I, AU - Schweizer,D, AU - Hemleben,V, PY - 1999/5/20/pubmed PY - 1999/5/20/medline PY - 1999/5/20/entrez SP - 311 EP - 20 JF - Molecular biology and evolution JO - Mol. Biol. Evol. VL - 16 IS - 3 N2 - Origin and rearrangement of ribosomal DNA repeats in natural allotetraploid Nicotiana tabacum are described. Comparative sequence analysis of the intergenic spacer (IGS) regions of Nicotiana tomentosiformis (the paternal diploid progenitor) and Nicotiana sylvestris (the maternal diploid progenitor) showed species-specific molecular features. These markers allowed us to trace the molecular evolution of parental rDNA in the allopolyploid genome of N. tabacum; at least the majority of tobacco rDNA repeats originated from N. tomentosiformis, which endured reconstruction of subrepeated regions in the IGS. We infer that after hybridization of the parental diploid species, rDNA with a longer IGS, donated by N. tomentosiformis, dominated over the rDNA with a shorter IGS from N. sylvestris; the latter was then eliminated from the allopolyploid genome. Thus, repeated sequences in allopolyploid genomes are targets for molecular rearrangement, demonstrating the dynamic nature of allopolyploid genomes. SN - 0737-4038 UR - https://www.unboundmedicine.com/medline/citation/10331258/Elimination_and_rearrangement_of_parental_rDNA_in_the_allotetraploid_Nicotiana_tabacum_ L2 - https://academic.oup.com/mbe/article-lookup/doi/10.1093/oxfordjournals.molbev.a026112 DB - PRIME DP - Unbound Medicine ER -