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Evolutionary dynamics of rDNA clusters on chromosomes of moths and butterflies (Lepidoptera)

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Title: Evolutionary dynamics of rDNA clusters on chromosomes of moths and butterflies (Lepidoptera)
Authors: Nguyen, Petr Browse this author
Sahara, Ken Browse this author →KAKEN DB
Yoshido, Atsuo Browse this author
Marec, František Browse this author
Keywords: ribosomal DNA
nucleolar organizer region
chromosome fusion
chromosome fission
karyotype evolution
ectopic recombination
Issue Date: Mar-2010
Publisher: Springer Netherlands
Journal Title: Genetica
Volume: 138
Issue: 3
Start Page: 343
End Page: 354
Publisher DOI: 10.1007/s10709-009-9424-5
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 (FISH) with a codling moth (Cydia pomonella) 18S rDNA probe. Most species showed one or two rDNA clusters in their haploid karyotype but exceptions with four to eleven 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.
Rights: The original publication is available at
Type: article (author version)
Appears in Collections:農学院・農学研究院 (Graduate School of Agriculture / Faculty of Agriculture) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 佐原 健

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