Structure Variation And Dynamics of the Nuclear Ribosomal Intergenic Spacer Region in Key Gibberella Fujikuroi Complex Species

Mirete, Salvador; Patiño, Belén; Jurado García-Posada, Miguel; Vázquez, Covadonga y González Jaén, María Teresa (2013). Structure Variation And Dynamics of the Nuclear Ribosomal Intergenic Spacer Region in Key Gibberella Fujikuroi Complex Species. "GENOME", v. 56 ; pp. 205-213. ISSN 0831-2796.

Descripción

Título: Structure Variation And Dynamics of the Nuclear Ribosomal Intergenic Spacer Region in Key Gibberella Fujikuroi Complex Species
Autor/es:
  • Mirete, Salvador
  • Patiño, Belén
  • Jurado García-Posada, Miguel
  • Vázquez, Covadonga
  • González Jaén, María Teresa
Tipo de Documento: Artículo
Título de Revista/Publicación: GENOME
Fecha: 2013
Volumen: 56
Materias:
Escuela: E.U.I.T. Agrícolas (UPM)
Departamento: Ciencia y Tecnología Aplicadas a la Ingeniería Técnica Agrícola [hasta 2014]
Licencias Creative Commons: Reconocimiento - Sin obra derivada - No comercial

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Resumen

The intergenic spacer (IGS) region of the ribosomal DNA was cloned and sequenced in eight species within the Gibberella fujikuroi species complex with anamorphs in the genus Fusarium , a group that includes the most relevant toxigenic species. DNA sequence analyses revealed two categories of repeated elements: long repeats and short repeats of 125 and 8 bp, respectively. Long repeats were present in two copies and were conserved in all the species analyzed, whereas different numbers of short repeat elements were observed, leading to species-specific IGS sequences with different length. In Fusarium subglutinans and Fusarium nygamai , these differences seemed to be the result of duplication and deletion events. Here, we propose a model based on unequal crossing over that can explain these processes. The partial IGS sequence of 22 Fusarium proliferatum isolates was also obtained to study variation at the intraspecific level. The results revealed no differences in terms of number or pattern of repeated elements and detected frequent gene conversion events. These results suggest that the homogenization observed at the intraspecific level might not be achieved primarily by unequal crossing-over events but rather by processes associated with recombination such as gene conversion events.

Más información

ID de Registro: 26572
Identificador DC: http://oa.upm.es/26572/
Identificador OAI: oai:oa.upm.es:26572
Depositado por: Memoria Investigacion
Depositado el: 05 Jun 2014 08:45
Ultima Modificación: 22 Sep 2014 11:41
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