Data/hora: 15/06/2024 03:00:31

Provedor de dados: | 76
País: | Brazil
Título: | Analysis of phenotypes altered by temperature stress and hipermutability in Drosophila willistoni
Autores: | D'Ávila,Marícia F.; Garcia,Rosane N.; Loreto,Elgion L. S.; Valente,Vera Lúcia da S.
Data: | 2008-09-01
Ano: | 2008
Palavras-chave: | D. willistoni; 17A2 strain; Temperature stress; Genetic variability; Hypermutability.
Resumo: | Drosophila willistoni (Sturtevant, 1916) is a species of the willistoni group of Drosophila having wide distribution from the South of USA (Florida) and Mexico to the North of Argentina. It has been subject of many evolutionary studies within the group, due to its considerable ability to successfully occupy a wide range of environments and also because of its great genetic variability expressed by different markers. The D. willistoni 17A2 strain was collected in 1991 in the state of Rio Grande do Sul, Brazil (30°05'S, 51°39'W), and has been maintained since then at the Drosophila laboratory of UFRGS. Different to the other D. willistoni strains maintained in the laboratory, the 17A2 strain spontaneously produced mutant males white-like (white eyes) and sepia-like (brown eyes) in stocks held at 17°C. In order to discover if this strain is potentially hypermutable, we submitted it to temperature stress tests. Eighteen isofemale strains were used in our tests and, after the first generation, all the individuals produced in each strain were maintained at 29°C. Different phenotype alterations were observed in subsequent generations, similar to mutations already well characterized in D. melanogaster (white, sepia, blistered and curly). In addition, an uncommon phenotype alteration with an apparent fusion of the antennae was observed, but only in the isofemale line nº 31. This last alteration has not been previously described as a mutation in the D. melanogaster species. Our results indicate that the D. willistoni 17A2 strain is a candidate for hypermutability, which presents considerable cryptic genetic variability. Different factors may be operating for the formation of this effect, such as the mobilization of transposable elements, effect of inbreeding and alteration of the heat-shock proteins functions.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0073-47212008000300009
Editor: | Museu de Ciências Naturais
Relação: | 10.1590/S0073-47212008000300009
Formato: | text/html
Fonte: | Iheringia. Série Zoologia  v.98 n.3 2008
Fonte: | info:eu-repo/semantics/openAccess