Untersuchungen �ber die Chromosomale Struktur Europ�ischer Vertreter der Drosophila Obscura-Gruppe

Mainx, Felix; Koske, Th.; Smital, E.

doi:10.1007/bf00309673

Cited by 26 publications

(17 citation statements)

References 6 publications

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“…The karyotype of D. subobscura consists of five acrocentric chromosomes and a dot chromosome. Following [82] the large chromosomes in this species are traditionally named as A (= X, the sex chromosome), J (= chromosomal element D of Mueller/Sturtevant/Novitski and homologous to arm 3L in Drosophila melanogaster [59]), U (= chromosomal element B and homologous to arm 2L), E (= chromosomal element C and homologous to arm 2R), and O (= chromosomal element E and homologous to arm 3R). The five major acrocentric chromosomes and the dot chromosome are divided into 100 sections (A: 1 – 16; J: 17 – 35; U: 36 – 53; E: 54 – 74; O: 75 – 99; Dot :100), and each section into 3–5 subsections (A, B, ...) [83].…”

Section: Methodsmentioning

confidence: 99%

Thermal evolution of gene expression profiles in Drosophila subobscura

et al. 2007

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Background: Despite its pervasiveness, the genetic basis of adaptation resulting in variation directly or indirectly related to temperature (climatic) gradients is poorly understood. By using 3-fold replicated laboratory thermal stocks covering much of the physiologically tolerable temperature range for the temperate (i.e., cold tolerant) species Drosophila subobscura we have assessed whole-genome transcriptional responses after three years of thermal adaptation, when the populations had already diverged for inversion frequencies, pre-adult life history components, and morphological traits. Total mRNA from each population was compared to a reference pool mRNA in a standard, highly replicated two-colour competitive hybridization experiment using cDNA microarrays.

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Section: Methodsmentioning

confidence: 99%

Thermal evolution of gene expression profiles in Drosophila subobscura

et al. 2007

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“…On the other hand, when the polytene chromosome map now in use for D. subobscura (Kunze-Mühl and Müller 1958) was made, the homologies were considered to be uncertain. D. subobscura has the ªbasicº chromosomal set consisting of five major acrocentric elements, designated by vowels, and a dot chromosome (Mainx et al 1953). According to Loukas et al (1979), element A is homologous with the X of D. melanogaster, U=2L, E=2R, I=3L and O=3R and the dot =4 of D. melanogaster.…”

Section: Introductionmentioning

confidence: 99%

Ultrastructure of regions containing homologous loci in polytene chromosomes of Drosophila melanogaster and Drosophila subobscura

et al. 1998

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We have used a new approach involving in situ hybridisation and electron microscopy to establish ultrastructural homologies between polytene chromosome regions of Drosophila melanogaster and Drosophila subobscura. Twelve probes were chosen to cover all the chromosomal elements: the myospheroid gene, the collagen type IV gene, the collagen-like gene, the w26 homeobox gene, the beta3 tubulin gene, the kinesin heavy chain gene, the tryptophan hydrolase gene, the Hsp82, Hsp22-26 and Hsp23-28, Hsp68, Hsp70 genes and the beta unit of the F0-F1 ATPase gene. Most of these loci were previously undescribed in D. subobscura and imprecisely located in D. melanogaster. We have demonstrated here, by an ultrastructural analysis of each chromosomal region, that homologous genetic loci tend to show a similar ultrastructure in the two species. With a few exceptions, the structural homology extends to the chromosomal regions surrounding the loci. In some cases, however, no structurally recognisable homology can be seen either in the locus or in its flanking regions.

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“…The amount of polymorphism is, however, variable from species to species, as well as in populations of the same species. Some species are chromosomally uniform, while in Drosophila willistoni, D. paulistoruni, and D. subobscura about 40 different gene arangements per species are known (Patterson and Stone, 1952;Dobzhansky, 1951;Mainx, Koske, and Smital, 1953). In some species and populations inversion heterozygotes are rare or absent, while in populations of D. willistoni which inhabit central Goyaz (Brazil) the average number of heterozygous inversions per individual is about 9, and one individual heterozygous for 16 inversions has been encountered (da Cunha, Burla, and Dobzhansky, 1950).…”

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confidence: 99%