The Ceratitis capitata homologue of the Drosophila sex-determining gene Sex-lethal is structurally conserved, but not sex-specifically regulated
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ABSTRACT In Drosophila, Sxl functions as a binary switch in sex determination. Under the control of the primary sex-determining signal, it produces functional protein only in XX animals to implement female development. Here we report that, in contrast to Drosophila, the Sxl homologue in the Medfly, Ceratitis capitata, expresses the same mRNAs and protein isoforms in both XX and XY animals irrespective of the primary sex-determining signal. Also, experiments with two inducible transgenes demonstrate that the corresponding Ceratitis SXL product has no significant sex-transforming effects when expressed in Drosophila. Similar results have been obtained for the Sxl homologue of Musca domestica (Meise, M., Hilfiker-Kleiner, D., Brunner, C., Dübendorfer, A., Nöthiger, R. and Bopp, D. (1998) Development 125, 1487-1494). Our findings suggest that Sxl acquired its master regulatory role in sex determination during evolution of the Acalyptratae group, most probably after phylogenetic divergence of the genus Drosophila from other genera of this group.Keywords:
Ceratitis capitata
Abstract Cuticle pigmentation was shown to be associated with body temperature for several relatively large species of insects, but it was questioned for small insects. Here we used a thermal camera to assess the association between drosophilid cuticle pigmentation and body temperature increase when individuals are exposed to light. We compared mutants of large effects within species ( Drosophila melanogaster ebony and yellow mutants). Then we analyzed the impact of naturally occurring pigmentation variation within species complexes ( Drosophila americana/Drosophila novamexicana and Drosophila yakuba/Drosophila santomea ). Finally we analyzed lines of D. melanogaster with moderate differences in pigmentation. We found significant differences in temperatures for each of the four pairs we analyzed. The temperature differences appeared to be proportional to the differently pigmented area: between Drosophila melanogaster ebony and yellow mutants or between Drosophila americana and Drosophila novamexicana, for which the whole body is differently pigmented, the temperature difference was around 0.6 °C ± 0.2 °C. By contrast, between D. yakuba and D. santomea or between Drosophila melanogaster Dark and Pale lines, for which only the posterior abdomen is differentially pigmented, we detected a temperature difference of about 0.14 °C ± 0.10 °C. This strongly suggests that cuticle pigmentation has ecological implications in drosophilids regarding adaptation to environmental temperature.
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Journal Article Drosophila koepferae: a New Member of the Drosophila serido (Diptera: Drosophilidae) Superspecies Taxon Get access Antonio Fontdevila, Antonio Fontdevila 2Departamento de Genética y Microbiología, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain. Search for other works by this author on: Oxford Academic Google Scholar Carles Pla, Carles Pla 2Departamento de Genética y Microbiología, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain.4Colegio Universitario de Girona, Universidad Autónoma de Barcelona, Girona, Spain. Search for other works by this author on: Oxford Academic Google Scholar Esteban Hasson, Esteban Hasson 2Departamento de Genética y Microbiología, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain.5Departamento de Ciencias Biólogicas, Laboratorio de Evolución, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Argentina. Search for other works by this author on: Oxford Academic Google Scholar Marvin Wasserman, Marvin Wasserman 3Biology Department, Queens College, Flushing, N. Y. 11367. Search for other works by this author on: Oxford Academic Google Scholar Armand Sanchez, Armand Sanchez 2Departamento de Genética y Microbiología, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain. Search for other works by this author on: Oxford Academic Google Scholar Horacio Naveira, Horacio Naveira 2Departamento de Genética y Microbiología, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain. Search for other works by this author on: Oxford Academic Google Scholar Alfredo Ruiz Alfredo Ruiz 2Departamento de Genética y Microbiología, Universidad Autónoma de Barcelona, Bellaterra (Barcelona), Spain. Search for other works by this author on: Oxford Academic Google Scholar Annals of the Entomological Society of America, Volume 81, Issue 3, 1 May 1988, Pages 380–385, https://doi.org/10.1093/aesa/81.3.380 Published: 01 May 1988 Article history Received: 06 October 1986 Accepted: 02 November 1987 Published: 01 May 1988
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A new species from Mexico, Drosophila wassermani Pitnick &; Heed, is described, illustrated, and compared with three related species, all belonging to the D. nannoptera species group in the subgenus Drosophila of the Drosophilidae.
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Abstract Cuticle pigmentation has been clearly demonstrated to impact body temperature for several relatively large species of insects, but it was questioned for small insects. Here we used a thermal camera to assess the impact of drosophilid cuticle pigmentation on body temperature when individuals are exposed to light. We compared mutants of large effects within species ( Drosophila melanogaster ebony and yellow mutants). Then we analyzed the impact of naturally occurring pigmentation variation within species complexes ( Drosophila americana/Drosophila novamexicana and Drosophila yakuba/Drosophila santomea ). Finally we analyzed lines of D. melanogaster with moderate differences in pigmentation. We found significant differences in temperatures for each of the four pairs we analyzed. The temperature differences appeared to be proportional to the differently pigmented area: between Drosophila melanogaster ebony and yellow mutants or between Drosophila americana and Drosophila novamexicana , for which the whole body is differently pigmented, the difference in temperatures was around 0.6°C ±0.2°C. By contrast, between D. yakuba and D. santomea or between Drosophila melanogaster Dark and Pale lines, for which only the posterior abdomen is differentially pigmented, we detected a temperature difference of about 0.14°C ±0.10°C. This demonstrates that cuticle pigmentation has ecological implications in drosophilids regarding adaptation to environmental temperature.
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Melanogaster
Drosophila Suzukii
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The picture wing species group of Hawaiian Drosophila is the only one to be relatively well known taxonomically, butspecies continue to be discovered. Here seven new species are described: Drosophila kikiko new species, Drosophila ki-noole new species, Drosophila moli new species, Drosophila nukea new species, Drosophila opuhe new species, Dros-ophila pihulu new species, and Drosophila pilipa new species. In addition, the male of Drosophila oreas Hardy isdescribed for the first time, and Drosophila virgulata Hardy & Kaneshiro is reduced to a new junior synonym of Dros-ophila lanaiensis Grimshaw, and the status of the latter and Drosophila ciliaticrus Hardy is clarified. A complete key to all the picture wing species is provided.
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One species in the Drosophila flavopilosa species group and another in the Drosophila morelia species group (Diptera: Drosophilidae) are described and illustrated. The larvae of the flies in these groups develop exclusively in flowers and, usually, are rarely collected from rotten plant parts. However, in this case, these new species were not collected from flowers but were captured with fermented banana and yeast. It indicates that this species may be attracted to the odors of yeast fermentation and not only solanaceous flowers. The specimens were collected at 3362 m above sea level. There are four species of the Drosophila flavopilosa species group and one species of the Drosophila morelia species group previously described from Ecuador. The new species are: Drosophila pseudokorefae sp. nov. in the Drosophila flavopilosa species group and Drosophila pseudomorelia sp. nov. in the Drosophila morelia species group.
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Journal Article Studies in the Genetics of Drosophila. III. the Drosophilidae of the Southwest Get access Studies in the Genetics of Drosophila. III. the Drosophilidae of the Southwest. Directed by Patterson J. T.. Pages 1-327, 66 figures plus 25 plates (10 in color), 7 × 10 inches, paper bound. The University of Texas Publication, No. 4313. Published by The University Of Texas, Austin, Texas. 1943. Price, $2.50. Annals of the Entomological Society of America, Volume 36, Issue 3, 1 September 1943, Page 454, https://doi.org/10.1093/aesa/36.3.454 Published: 01 September 1943
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