English   español  
Por favor, use este identificador para citar o enlazar a este item: http://hdl.handle.net/10261/2220
Compartir / Impacto:
Estadísticas
Add this article to your Mendeley library MendeleyBASE
Ver citas en Google académico
Visualizar otros formatos: MARC | Dublin Core | RDF | ORE | MODS | METS | DIDL
Exportar otros formatos: Exportar EndNote (RIS)Exportar EndNote (RIS)Exportar EndNote (RIS)
Título : Molecular evolution of aphids and their primary (buchnera sp.) and secondary endosymbionts: implications for the role of symbiosis in insect evolution
Autor : Sabater-Muñoz, Beatriz; Ham, Roeland C.H.J. van; Martínez-Torres, David; Silva-Moreno, Francisco; Latorre-Castillo, Amparo; Moya-Simarro, Andrés
Palabras clave : Aphids
Buchnera sp
Secondary Endosymbionts
Phylogenetic Analysis
Genome Reduction
Fecha de publicación : 2001
Editor: Asociación Interciencia
Citación : INCI, oct. 2001, vol.26, no.10, p.508-512
Resumen: Aphids maintain an obligate, endosymbiotic association with Buchnera sp., a bacterium closely related to Escherichia coli. Bacteria are housed in specialized cells of organ-like structures called bacteriomes in the hemocoel of the aphid and are maternally transmitted. Phylogenetic studies have shown that the association had a single origin, dated about 200-250 million years ago, and that host and endosymbiont lineages have evolved in parallel since then. However, the pattern of deepest branching within the aphid family remains unsolved, which thereby hampers an appraisal of, for example, the role played by horizontal gene transfer in the early evolution of Buchnera. The main role of Buchnera in this association is the biosynthesis and provisioning of essential amino acids to its aphid host. Physiological and metabolic studies have recently substantiated such nutritional role. In addition, genetic studies of Buchnera from several aphids have shown additional modifications, such as strong genome reduction, high A+T content compared to free-living bacteria, differential evolutionary rates, a relative increase in the number of non-synonymous substitutions, and gene amplification mediated by plasmids. Symbiosis is an active process in insect evolution as revealed by the intermediate values of the previous characteristics showed by secondary symbionts compared to free-living bacteria and Buchnera.
URI : http://hdl.handle.net/10261/2220
ISSN: 0378-1844
Aparece en las colecciones: (CAB) Artículos
Ficheros en este ítem:
Fichero Descripción Tamaño Formato  
molec.pdf200,77 kBAdobe PDFVista previa
Visualizar/Abrir
Mostrar el registro completo
 


NOTA: Los ítems de Digital.CSIC están protegidos por copyright, con todos los derechos reservados, a menos que se indique lo contrario.