ArticleChromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology2006
Contrast between extensive variation of 28S rDNA and stability of 5S rDNA and telomeric repeats in the diploid-polyploid Squalius alburnoides complex and in its maternal ancestor Squalius pyrenaicus (Teleostei, Cyprinidae).
Article in Chromosome research : an international journal on the molecular, supramolecular and evolutionary aspects of chromosome biology, 2006. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 23 papers.
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23 citing papers in PubMed, 42 citations in OpenAlex.
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- Chromosomes of Asian cyprinid fishes: Variable karyotype patterns and evolutionary trends in the genus Osteochilus (Cyprinidae, Labeoninae, "Osteochilini").Genetics and molecular biology · 2020Article
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- Chromosomes of Asian cyprinid fishes: cytogenetic analysis of two representatives of small paleotetraploid tribe Probarbini.Molecular cytogenetics · 2018Article
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- Karyotype differentiation in 19 species of river loach fishes (Nemacheilidae, Teleostei): extensive variability associated with rDNA and heterochromatin distribution and its phylogenetic and ecological interpretation.BMC evolutionary biology · 2015Article
- Introgressive hybridization as a promoter of genome reshuffling in natural homoploid fish hybrids (Cyprinidae, Leuciscinae).Heredity · 2014Article
- Molecular cytogenetic analysis of the crucian carp, Carassius carassius (Linnaeus, 1758) (Teleostei, Cyprinidae), using chromosome staining and fluorescence in situ hybridisation with rDNA probes.Comparative cytogenetics · 2014Article
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- The 5S rDNA high dynamism in Diplodus sargus is a transposon-mediated mechanism. Comparison with other multigene families and Sparidae species.Journal of molecular evolution · 2013Article
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- Polyploidy in fungi: evolution after whole-genome duplication.Proceedings. Biological sciences · 2012Review
- Reconstruction of the evolutionary history of Saccharomyces cerevisiae x S. kudriavzevii hybrids based on multilocus sequence analysis.PloS one · 2012Article
- Nucleotide variation and physical mapping of ribosomal genes using FISH in genus Tor (Pisces, Cyprinidae).Molecular biology reports · 2011Article
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Authors and funding
4 authors at 3 institutions in 2 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
The diploid-polyploid Squalius alburnoides complex resulted from interspecific hybridization. The chromosomal mapping of 28S and 5S ribosomal genes and of (TTAGGG)n telomeric repeats was performed on specimens from the complex and from the sympatric bisexual species S. pyrenaicus (the complex maternal ancestor) as part of an investigation of the evolutionary relationships between genomic constitutions and the consequences of the ongoing polyploidization process in terms of chromosome reshaping. Contrasting results were obtained. While results with 5S rDNA and telomeric probes gave an impression of genomic stability, the variability detected with 28S rDNA probe suggested quite the opposite. The 5S rDNA probe mapped constantly to three chromosomes per haploid genome with apparently conserved locations in morphologically similar chromosomes; conversely, prominent intra- and inter-individual variations of 28S rDNA and of syntenic sites with 5S rDNA were detected with regard to number, size and location. Hypotheses for the causes of such polymorphisms are discussed. The terminal position of most 28S rDNA sites and the absence of detectable interstitial telomeric sequences suggest a mechanism that does not involve major chromosomal rearrangements. These fishes share similar patterns for the studied cytogenetic markers which may be taken as evidence of an apparent stability that may be hiding extensive and subtle genome variations that are possibly related to an ongoing evolutionary process of genome tetraploidization and speciation.
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