Polytene chromosome map and inversion polymorphism in Drosophila mediopunctata

Ananina, Galina; Peixoto, Alexandre A.; Souza, Wilma N; Klaczko, Louis Bernard

doi:10.1590/s0074-02762002000500019

Cited by 15 publications

(17 citation statements)

References 10 publications

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“…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%

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: 99%

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

2012

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“…Understanding this complexity can be simplified by assigning the inversions to distal and proximal groups, based on the chromosome region in which they occur. The distal group includes eight inversions (DA, DI, DS, DP, DV, DR, DL, and DJ), while the proximal region contains nine (PC0,PC1,PC2,PC3,PC4,PC5,PB0,PA0,and PA8) (Peixoto and Klaczko, 1991;Ananina et al, 2002).…”

Section: Introductionmentioning

confidence: 99%

Chromosomal inversion polymorphism in Drosophila mediopunctata: seasonal, altitudinal, and latitudinal variation

Ananina

Peixoto²,

Bitner‐Mathé

et al. 2004

Genet. Mol. Biol.

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The most polymorphic chromosome for inversions in Drosophila mediopunctata is the chromosome II, where 17 inversions have been found, eight of which occurring in the distal region and nine in the proximal region. We present an analysis of the chromosome II inversion polymorphism with respect to seasonal, altitudinal and latitudinal variation. In D. mediopunctata from the Parque Nacional do Itatiaia (southeastern Brazil), the frequencies of three of the distal inversions (namely DA, DS, and DP) vary seasonally. These inversions also show altitudinal clines in their frequencies. This microgeographic pattern was not observed on a macrogeographic scale. D. mediopunctata from Porto Alegre are less polymorphic for inversions than other populations, the most remarkable reduction occurring in the proximal region of chromosome II. There is a considerable difference between D. mediopunctata from Campinas and specimens from Serra do Japi, which are separated by only 50 km. In contrast, D. mediopunctata from Serra do Japi are much more similar to specimens from the Parque Nacional do Itatiaia, which is 200 km far.

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“…In Brazil, an important species from the tripunctata group is D. mediopunctata. Several aspects of its biology make it an interesting model for studying the genetics of natural populations and various research studies characterizing its evolutionary biology have been carried out [Klaczko and Bitner-Mathé, 1990;Ananina et al, 2002; for a review, see Klaczko, 2006].…”

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Comparative Analysis of the Chromosomal Positions of rDNA Genes in Species of the <i>tripunctata</i> Radiation of <i>Drosophila</i>

Brianti

Ananina

Recco‐Pimentel

et al. 2009

Cytogenet Genome Res

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The location of rDNA on chromosomes has been found to be highly variable in different groups of insect families of various orders. Yet, in other insect families the rDNA position is relatively constant. This contrast so far has received limited attention. We investigated the rDNA position on mitotic chromosomes in 18 species of Drosophila, 16 of which are from the tripunctata radiation, subgenus Drosophila, through fluorescent in situ hybridization (FISH). All species showed fluorescent signals only on the sex chromosomes. On the X chromosome a single fluorescent mark, but with variable locations, was found. On the Y, we observed variation both in location and in number of fluorescent marks (from 1 to 5). This constancy of chromosome location, in contrast to the great variability found in other groups, is consistent with the work carried out in other species of Drosophila. This suggests that the presence of a nucleolus organizer region (NOR) on each sex chromosome is probably an ancestral condition in the genus. Moreover, this difference in the variation of rDNA position among groups points out an interesting evolution question, which deserves further study.

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Polytene chromosome map and inversion polymorphism in Drosophila mediopunctata

Cited by 15 publications

References 10 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

Chromosomal inversion polymorphism in Drosophila mediopunctata: seasonal, altitudinal, and latitudinal variation

Comparative Analysis of the Chromosomal Positions of rDNA Genes in Species of the <i>tripunctata</i> Radiation of <i>Drosophila</i>

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