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Titolo:
Microsatellite variation in colonizing and palearctic populations of Drosophila subobscura
Autore:
Pascual, M; Aquadro, CF; Soto, V; Serra, L;
Indirizzi:
Univ Barcelona, Fac Biol, Dept Genet, E-08028 Barcelona, Spain Univ Barcelona Barcelona Spain E-08028 t Genet, E-08028 Barcelona, Spain Cornell Univ, Dept Mol Biol & Genet, Ithaca, NY 14853 USA Cornell Univ Ithaca NY USA 14853 t Mol Biol & Genet, Ithaca, NY 14853 USA
Titolo Testata:
MOLECULAR BIOLOGY AND EVOLUTION
fascicolo: 5, volume: 18, anno: 2001,
pagine: 731 - 740
SICI:
0737-4038(200105)18:5<731:MVICAP>2.0.ZU;2-H
Fonte:
ISI
Lingua:
ENG
Soggetto:
MITOCHONDRIAL-DNA; AMERICAN OYSTER; CRASSOSTREA-VIRGINICA; NORTH-AMERICA; CHROMOSOMAL ARRANGEMENTS; GENETIC DIFFERENTIATION; MUTATIONAL PROCESSES; NATURAL-POPULATIONS; SIZE HOMOPLASY; FOUNDER EVENT;
Keywords:
Drosophila subobscura; colonization; microsatellites; founder effect; gene flow; two-phase mutation model;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Pascual, M Univ Barcelona, Fac Biol, Dept Genet, Diagonal 645, E-08028 Barcelona, Spain Univ Barcelona Diagonal 645 Barcelona Spain E-08028 ona, Spain
Citazione:
M. Pascual et al., "Microsatellite variation in colonizing and palearctic populations of Drosophila subobscura", MOL BIOL EV, 18(5), 2001, pp. 731-740

Abstract

The recent colonization of North America by Drosophila subobscura has provided a great opportunity to analyze a colonization process from the beginning. A comparative study using 10 microsatellite loci was conducted for fiveEuropean and two North American populations. No genetic differentiation between European populations was detected, indicating that gene flow is high among them and that the microsatellites used in the present work represent neutral markers not subject to differentiation due to selection. Extensive reduction in the number of alleles and a significant decrease in heterozygosity in colonizing populations were detected that could be explained by thefounder effect and a subsequent quick but not infinite expansion. Assumingthat all alleles present in the colonized area were carried by the sample of colonizers, we estimated that most probably 4-11 individuals expanded inthe new area. F-ST and the chord distance measures reflect the colonization process more accurately, since drift has been the major force in differentiating the Old and New World populations, and thus other measures considering allele size differences, such as Rho(ST) and delta mu (2), are less reliable for studying nonequilibrium populations. Finally, our results were consistent with the two-phase microsatellite mutational model, indicating that most alleles are generated by gain or loss of a repeat unit, while some alleles originate by more complex mutations.

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Documento generato il 29/11/20 alle ore 09:57:10