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Titolo:
Molecular evolution of aphids and their primary (Buchnera sp.) and secondary endosymbionts: Implications for the role of symbiosis in insect evolution
Autore:
Sabater, B; Van Ham, RCHJ; Martinez-Torres, D; Silva, F; Latorre, A; Moya, A;
Indirizzi:
Univ Valencia, Dept Genet, Inst Cavanilles Biodiversidad & Biol Evolut, Valencia, Spain Univ Valencia Valencia Spain odiversidad & Biol Evolut, Valencia, Spain Univ Utrecht, NL-3508 TC Utrecht, Netherlands Univ Utrecht Utrecht Netherlands NL-3508 TC 3508 TC Utrecht, Netherlands CSIC, INTA, Ctr Astrobiol, Madrid, Spain CSIC Madrid SpainCSIC, INTA, Ctr Astrobiol, Madrid, Spain
Titolo Testata:
INTERCIENCIA
fascicolo: 10, volume: 26, anno: 2001,
pagine: 508 -
SICI:
0378-1844(200110)26:10<508:MEOAAT>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
ACYRTHOSIPHON-PISUM; LEUCINE BIOSYNTHESIS; BACTERIA; APHIDICOLA; GENES; PLASMIDS; MICROORGANISMS; HOMOPTERA; SEQUENCE; SYSTEM;
Keywords:
aphids; Buchnera sp.; secondary endosymbionts; phylogenetic analysis; genome reduction;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Citazioni:
54
Recensione:
Indirizzi per estratti:
Indirizzo: Sabater, B Univ Valencia, Dept Genet, Inst Cavanilles Biodiversidad & BiolEvolut, Apartado Correos 2085, Valencia, Spain Univ Valencia Apartado Correos 2085 Valencia Spain cia, Spain
Citazione:
B. Sabater et al., "Molecular evolution of aphids and their primary (Buchnera sp.) and secondary endosymbionts: Implications for the role of symbiosis in insect evolution", INTERCIENCI, 26(10), 2001, pp. 508

Abstract

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 familyremains unsolved, which thereby hampers tin appraisal of, for example, therole 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 cis revealed by the intermediate values of the previous characteristics showed by secondary symbionts compared to free-living bacteria and Buchnera.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 19/01/20 alle ore 20:33:58