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Early evolutionary colocalization of the nuclear ribosomal 5S and 45S gene families in seed plants: evidence from the living fossil gymnosperm Ginkgo biloba

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Early evolutionary colocalization of the nuclear ribosomal 5S and 45S gene families in seed plants: evidence from the living fossil gymnosperm Ginkgo biloba

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dc.contributor.author Galián, José A. es_ES
dc.contributor.author Rosato, Marcela es_ES
dc.contributor.author Rosselló Picornell, Josep Antoni es_ES
dc.date.accessioned 2015-06-19T10:21:23Z
dc.date.available 2015-06-19T10:21:23Z
dc.date.issued 2012 es_ES
dc.identifier.citation Heredity Vol. 108 Issue 6: pp. 640-646 es_ES
dc.identifier.uri http://hdl.handle.net/10550/44578
dc.description.abstract In seed plants, the colocalization of the 5S loci within the intergenic spacer (IGS) of the nuclear 45S tandem units is restricted to the phylogenetically derived Asteraceae family. However, fluorescent in situ hybridization (FISH) colocalization of both multigene families has also been observed in other unrelated seed plant lineages. Previous work has identified colocalization of 45S and 5S loci in Ginkgo biloba using FISH, but these observations have not been confirmed recently by sequencing a 1.8 kb IGS. In this work, we report the presence of the 45S–5S linkage in G. biloba, suggesting that in seed plants the molecular events leading to the restructuring of the ribosomal loci are much older than estimated previously. We obtained a 6.0 kb IGS fragment showing structural features of functional sequences, and a single copy of the 5S gene was inserted in the same direction of transcription as the ribosomal RNA genes. We also obtained a 1.8 kb IGS that was a truncate variant of the 6.0 kb IGS lacking the 5S gene. Several lines of evidence strongly suggest that the 1.8 kb variants are pseudogenes that are present exclusively on the satellite chromosomes bearing the 45S–5S genes. The presence of ribosomal IGS pseudogenes best reconciles contradictory results concerning the presence or absence of the 45S–5S linkage in Ginkgo. Our finding that both ribosomal gene families have been unified to a single 45S–5S unit in Ginkgo indicates that an accurate reassessment of the organization of rDNA genes in basal seed plants is necessary. es_ES
dc.subject rDNA es_ES
dc.subject intergenic spacer es_ES
dc.subject 45S–5S unit es_ES
dc.subject ribosomal pseudogenes gymnosperm es_ES
dc.subject phylogenetic relict es_ES
dc.title Early evolutionary colocalization of the nuclear ribosomal 5S and 45S gene families in seed plants: evidence from the living fossil gymnosperm Ginkgo biloba es_ES
dc.type journal article es_ES
dc.identifier.doi 10.1038/hdy.2012.2 es_ES
dc.identifier.idgrec 089511 es_ES

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