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Titolo:
Molecular population genetics of the rp49 gene region in different chromosomal inversions of Drosophila subobscura
Autore:
Rozas, J; Segarra, C; Ribo, G; Aguade, M;
Indirizzi:
Univ Barcelona, Fac Biol, Dept Genet, Barcelona 08071, Spain Univ Barcelona Barcelona Spain 08071 Dept Genet, Barcelona 08071, Spain CSIC, Cid, Barcelona 08036, Spain CSIC Barcelona Spain 08036CSIC, Cid, Barcelona 08036, Spain
Titolo Testata:
GENETICS
fascicolo: 1, volume: 151, anno: 1999,
pagine: 189 - 202
SICI:
0016-6731(199901)151:1<189:MPGOTR>2.0.ZU;2-#
Fonte:
ISI
Lingua:
ENG
Soggetto:
DNA-SEQUENCE DATA; GEOGRAPHIC SUBDIVISION; AFRICAN POPULATION; MELANOGASTER; PSEUDOOBSCURA; ARRANGEMENTS; CONVERSION; EVOLUTION; POLYMORPHISM; INFORMATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Agriculture,Biology & Environmental Sciences
Life Sciences
Citazioni:
53
Recensione:
Indirizzi per estratti:
Indirizzo: Rozas, J Univ Barcelona, Fac Biol, Dept Genet, Diagonal 645, Barcelona 08071, Spain Univ Barcelona Diagonal 645 Barcelona Spain 08071 a 08071, Spain
Citazione:
J. Rozas et al., "Molecular population genetics of the rp49 gene region in different chromosomal inversions of Drosophila subobscura", GENETICS, 151(1), 1999, pp. 189-202

Abstract

Nucleotide variation at the ribosomal protein 49 (rp49) gene region has been studied in 75 lines of Drosophila subobscura belonging to four chromosomal arrangements (O-st, O3+4, O3+4+8, and O3+4+23). The location of the rp49gene region within the inversion loop differs among heterokaryotypes: it is very close to one of the breakpoints in heterozygotes involving O-st chromosomes, while it is in a more central position in all other heterokaryotypes. The distribution of nucleotide polymorphism in the different arrangements is consistent with a monophyletic origin of the inversions. The data also provide evidence that gene conversion and possibly double crossover are involved in shuffling nucleotide variation among gene arrangements. The analyses reveal that the level of genetic exchange is higher when the region islocated in a more central position of the inverted fragment than when it is close to the breakpoints. The pairwise difference distributions as well as the negative values of Tajima's and Fu and Li's statistics further support the hypothesis that nucleotide variation within chromosomal arrangements still reflects expansion after the origin of the inversions. Under the expansion model, we have estimated the time of origin of the studied inversions.

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Documento generato il 04/12/20 alle ore 12:44:58