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Three decades of studies on chromosomal polymorphism of Drosophila willistoni and description of fifty different rearrangements

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Three decades of studies on chromosomal polymorphism of Drosophila willistoni and description of fifty different rearrangements

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Título Three decades of studies on chromosomal polymorphism of Drosophila willistoni and description of fifty different rearrangements
Autor Rhode, Cláudia
Gaiesky, Vera Lucia da Silva Valente
Abstract Drosophila willistoni (Insecta, Diptera) is considered a paradigm for evolutionary studies. Their chromosomes are characterized by multiple paracentric inversions that make it hard to identify and describe chromosomal polymorphisms. In the present report we attempted to systematize the description of all the 50 inversions found in the last three decades, since we have been studying the chromosomes of several individuals of 30 different populations, including the one used in the genome sequencing project (Gd-H4-1). We present the photographic register of 11 arrangements in the left arm of the X chromosome (XL), eight in the right arm (XR), 10 in the left arm of chromosome II (IIL), eight in its right arm (IIR) and 13 in chromosome III. This information also includes their breakpoints on the reference photomap. A clear geographic difference was detected in XL and XR, with different fixed arrangements depending on the origin of the population studied. Through the comparison of all X arrangements it was possible to infer the putative ancestral arrangements, i.e., those related to all the remaining arrangements through the small number of inversions that occurred in the past, which we will call XL-A and XR-A. In the autosomes (IIL/IIR and III), fixed inversions were detected, but most are segregating in different frequencies along the geographical distribution of the D. willistoni populations.
Contido em Genetics and molecular biology. Vol. 35, n. 4 supl (Dec. 2012), p. 966-979
Assunto Citogenética
Cromossomos politênicos
Drosophila willistoni
Polimorfismo
[en] cytogenetic
[en] Drosophila willistoni
[en] inversions
[en] polytene chromosomes
Origem Nacional
Tipo Artigo de periódico
URI http://hdl.handle.net/10183/87939
Arquivos Descrição Formato
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