Evolutionary dynamics of rDNA clusters on chromosomes of moths and butterflies (Lepidoptera)
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TLDR
E ectopic recombination is proposed, i.e., homologous recombination between repetitive sequences of non-homologous chromosomes, as a primary motive force in rDNA repatterning.Abstract:
We examined chromosomal distribution of major ribosomal DNAs (rDNAs), clustered in the nucleolar organizer regions (NORs), in 18 species of moths and butterflies using fluorescence in situ hybridization with a codling moth (Cydia pomonella) 18S rDNA probe. Most species showed one or two rDNA clusters in their haploid karyotype but exceptions with 4-11 clusters also occurred. Our results in a compilation with previous data revealed dynamic evolution of rDNA distribution in Lepidoptera except Noctuoidea, which showed a highly uniform rDNA pattern. In karyotypes with one NOR, interstitial location of rDNA prevailed, whereas two-NOR karyotypes showed mostly terminally located rDNA clusters. A possible origin of the single interstitial NOR by fusion between two NOR-chromosomes with terminal rDNA clusters lacks support in available data. In some species, spreading of rDNA to new, mostly terminal chromosome regions was found. The multiplication of rDNA clusters without alteration of chromosome numbers rules out chromosome fissions as a major mechanism of rDNA expansion. Based on rDNA dynamics in Lepidoptera and considering the role of ordered nuclear architecture in karyotype evolution, we propose ectopic recombination, i.e., homologous recombination between repetitive sequences of non-homologous chromosomes, as a primary motive force in rDNA repatterning.read more
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Distribution of 45S rDNA sites in chromosomes of plants: Structural and evolutionary implications
Fernando Roa,Marcelo Guerra +1 more
TL;DR: The location of 45S rDNA sites do not vary randomly, occurring preferentially on the short arm and in the terminal region of chromosomes in angiosperms and in gymnosperms.
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High dynamics of rDNA cluster location in kissing bug holocentric chromosomes (Triatominae, Heteroptera).
Yanina Panzera,Sebastián Pita,María José Ferreiro,Inés Ferrandis,Carol Lages,Rubén Pérez,Ana Elisa Bauer de Camargo Silva,Marcelo Guerra,Francisco Panzera +8 more
TL;DR: The results show a striking variability at the inter- and intraspecific level, never reported so far in holocentric chromosomes, revealing the extraordinary genomic dynamics that occurred during the evolution in this group of insects.
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Chromosomal Mapping of Repetitive DNAs in the Grasshopper Abracris flavolineata Reveal Possible Ancestry of the B Chromosome and H3 Histone Spreading
TL;DR: The organization of repetitive DNAs in the A complement and B chromosome system in the grasshopper species Abracris flavolineata is described using classical cytogenetic techniques and FISH analysis using probes for five multigene families, telomeric repeats and repetitive C0t-1 DNA fractions.
Journal ArticleDOI
Chromosomal organization of the 18S and 5S rRNAs and histone H3 genes in Scarabaeinae coleopterans: insights into the evolutionary dynamics of multigene families and heterochromatin.
Diogo Cavalcanti Cabral-de-Mello,Sárah Gomes de Oliveira,Rita de Cássia de Moura,Cesar Martins +3 more
TL;DR: The data obtained indicate that both heterochromatin and the 45S rDNA loci could be constrained by similar evolutionary forces regulating spreading in the distinct Scarabaeinae subfamily lineages, and provide evidence that different evolutionary forces act at the heterochromeatin andThe results indicate that the variability of the 45s rDNA chromosomal clusters is not associated with macro-chromosomal rearrangements but are instead related to the spread of heterochROMatin.
Journal ArticleDOI
Tracking the evolution of sex chromosome systems in Melanoplinae grasshoppers through chromosomal mapping of repetitive DNA sequences
Octavio M. Palacios-Gimenez,Elio Rodrigo Daniel Castillo,Dardo Andrea Marti,Diogo Cavalcanti Cabral-de-Mello +3 more
TL;DR: This work used classical cytogenetic and FISH analyses to examine the repetitive DNA sequences in six phylogenetically related Melanoplinae species to suggest a common origin and subsequent differential accumulation of repetitive DNAs in the sex chromosomes of Dichromatos and an independent origin of the sex chromosome of the neo-XY and neo-X1X2Y systems.
References
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In situ hybridization confirms jumping nucleolus organizing regions in Allium
Ingo Schubert,Ulrich Wobus +1 more
TL;DR: In situ hybridization with a 125I-rDNA clone from Vicia faba was performed against Allium cepa and three strains of top onion, which represent hybrids between A. cEPa and A. fistulosum, and in principle supports the inference drawn from the Ag-NOR patterns that NORs can jump between terminal heterochromatin blocks of different Allium chromosomes in the parental species.