Evolutionary Genetics of Drosophila Mediopunctata

Klaczko, Louis Bernard

doi:10.1007/s10709-005-1431-6

Cited by 29 publications

(32 citation statements)

References 34 publications

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“…Gene arrangement DI did not show any seasonal variation or correlation with either temperature or altitude. This pattern suggests that natural selection is maintaining the observed variation (Ananina et al 2004, Klaczko 2006. Hatadani & Klaczko (2008) showed that Drosophila mediopunctata wing size and shape were influenced by second chromosome karyotype, sex, and temperature under controlled laboratory conditions.…”

Section: Introductionmentioning

confidence: 88%

“…Moreover, the frequencies of inversions DA, DP and DS showed cyclical seasonal variation (Klaczko 2006). The frequency of DA (usually associated with proximal arrangement PA0) increased in cold dry months and decreased in warmer rainy months, while pooled frequencies of DP and DS (both associated with PC0) showed an opposite pattern.…”

Section: Introductionmentioning

confidence: 91%

“…There is strong linkage disequilibrium between inversions in the distal and proximal regions of the second chromosome. Among the 72 possible combinations of distal region and proximal inversions found (Peixoto & Klaczko 1991, Ananina et al 2002, Klaczko 2006), ~90% of the total is represented by 5 haplotypes (DA-PA0, DI-PB0, DS-PC0, DP-PC0 and DV-PC0).…”

Section: Introductionmentioning

confidence: 99%

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Unexpected long-term changes in chromosome inversion frequencies in a Neotropical Drosophila species

2012

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Several long-term studies on Drosophila chromosome inversion polymorphisms have shown that inversions can be a valuable tool to monitor rapid genetic shifts with climate change. However, so far, no study has assessed the effects of climate change in populations of Neotropical Drosophila species. After more than 2 decades, new samples were collected from the Parque Nacional do Itatiaia, Rio de Janeiro, to assess any changes in inversion frequencies and to detect possible global warming effects on the inversion polymorphism of the second chromosome of D. mediopunctata. Our results show unexpected simultaneous changes in inversion frequencies associated with climate change. Perhaps climatic variables other than temperature underlying the process caused such change, although potential genetic drift effects or demographic factors cannot be excluded. Further studies assessing population genetic structure may help clarify the changes observed.

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Section: Introductionmentioning

confidence: 88%

Section: Introductionmentioning

confidence: 91%

Section: Introductionmentioning

confidence: 99%

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Unexpected long-term changes in chromosome inversion frequencies in a Neotropical Drosophila species

2012

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“…First, inversion frequencies in D. mediopunctata change during the year so that PA0 tends to be more frequent in colder months than in warmer months, whereas PC0 undergoes the opposite changes (Klaczko, 1995). These data suggest that PA0 is more adapted to lower temperatures and PC0 to higher temperatures.…”

Section: Chromosome Inversionsmentioning

confidence: 96%

Colour polymorphism in Drosophila mediopunctata: genetic (chromosomal) analysis and nonrandom association with chromosome inversions

et al. 2004

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The presence of three dark spots on the abdomen is typical of the tripunctata group of Drosophila, which is the second largest Neotropical group, with 56 species. In some species, such as D. mediopunctata, the colour pattern varies considerably: ranging from flies showing no spots up to flies with three dark spots. In this paper, we present a genetic (chromosomal) analysis of this character showing that this colour polymorphism is genetically determined mainly by the second chromosome. Since this chromosome is the most polymorphic for inversions in this species, we also examined the influence of the inversions on this character. We used strains in which different second chromosomes were placed on the same genetic background and the offspring between them. We found a nonrandom association between the number of spots and the inversions PA0 and PC0. Thus, our results are consistent with the idea that the factors or genes determining a conspicuous polymorphism are likely to be associated, forming a supergene, and this association would be most efficiently accomplished through a chromosome inversion. Moreover, this is the first time that an association between a conspicuous morphological polymorphism and chromosome inversions has been described.

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“…Considering the climatic changes that occurred during these two decades in the region of Itatiaia Park, this suggest that temperature change has little influence on the seasonal changes in the frequencies of inversions in this species. Climate changes may have affected other genetic or morphological features, which may be more directly related to the inversions in chromosome II of D. mediopunctata [23][24][25][26].…”

Section: Drosophila Buzzatiimentioning

confidence: 99%

Drosophila Chromosomal Polymorphism: From Population Aspects to Origin Mechanisms of Inversions

Garcia¹,

Valente²

2018

Drosophila Melanogaster - Model for Recent Advances in Genetics and Therapeutics

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High rates of chromosomal rearrangements are remarkably abundant in Drosophila Fallén, 1832 (Insecta, Diptera) genus, highlighting the paracentric inversions. Since different species of this genus are paradigms for genetics, evolutionary, and population studies, polymorphism analyses for chromosomal inversions have provided basic knowledge for beautiful biological questions. Chromosomal inversions suppress meiotic recombination and thus, natural selection can act to preserve favorable gene complexes. Analyses of natural and laboratory populations show that these polymorphisms provide adaptive advantages to their carriers in relation to diverse factors, such as niche exploration and climatic factors. In addition, due to their monophyletic origin, they also serve as genetic markers for the construction of unrooted phylogenies. With the increasing domain of molecular techniques and genome sequencing, factors such as the reuse of breakpoints by different inversions and the mechanisms that give rise to these polymorphisms have been exploited with scientific refinement. These analyses show the presence of regions that are hot spots for breakpoints, fitting the fragile breakage chromosomal evolution model, as well as the involvement of transposition elements at the origin of chromosomal inversions.

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Evolutionary Genetics of Drosophila Mediopunctata

Cited by 29 publications

References 34 publications

Unexpected long-term changes in chromosome inversion frequencies in a Neotropical Drosophila species

Unexpected long-term changes in chromosome inversion frequencies in a Neotropical Drosophila species

Colour polymorphism in Drosophila mediopunctata: genetic (chromosomal) analysis and nonrandom association with chromosome inversions

Drosophila Chromosomal Polymorphism: From Population Aspects to Origin Mechanisms of Inversions

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