Crossing over does occur in males of<i>Drosophila ananassae</i>from natural populations

Goñi, Beatriz; Matsuda, Muneo; Yamamoto, Masatoshi; Vilela, Carlos Ribeiro; Tobari, Yoshiko N.

doi:10.1139/g2012-037

Cited by 7 publications

(3 citation statements)

References 20 publications

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“…The connection between the lack of male meiotic recombination and supposed lack of MSCI in D. melanogaster would fit the predictions of their hypothesis 3. However, today it is known that lack of meiotic recombination in males is not extended to the entire genus 15.…”

Section: Genetic and Cytological Observations Of Msci In Drosophilasupporting

confidence: 54%

“…However, two recently published data revived the idea that MSCI in Drosophila is connect to the evolution of mechanisms that avoid harmful recombination. First, not all species in the genus lack male recombination, as crossing over does occur in males of D. ananassae from natural populations 15. Second, it is possible that the dot chromosome of D. melanogaster was ancestrally a differentiated X chromosome that still bears sequence and architectural features used in sex chromosome-specific regulatory mechanisms, including in meiosis 16.…”

Section: Introductionmentioning

confidence: 99%

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Meiotic Sex Chromosome Inactivation in Drosophila

Vibranovski¹

2014

J. Genomics

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In several different taxa, there is indubitable evidence of transcriptional silencing of the X and Y chromosomes in male meiotic cells of spermatogenesis. However, the so called meiotic sex chromosome inactivation (MSCI) has been recently a hot bed for debate in Drosophila melanogaster. This review covers cytological and genetic observations, data from transgenic constructs with testis-specific promoters, global expression profiles obtained from mutant, wild-type, larvae and adult testes as well as from cells of different stages of spermatogenesis. There is no dispute on that D. melanogaster spermatogenesis presents a down-regulation of X chromosome that does not result from the lack of dosage compensation. However, the issue is currently focused on the level of reduction of X-linked expression, the precise time it occurs and how many genes are affected. The deep examination of data and experiments in this review exposes the limitations intrinsic to the methods of studying MSCI in D. melanogaster. The current methods do not allow us to affirm anything else than the X chromosome down-regulation in meiosis (MSCI). Therefore, conclusion about level, degree or precise timing is inadequate until new approaches are implemented to know the details of MSCI or other processes involved for D. melanogaster model.

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Section: Genetic and Cytological Observations Of Msci In Drosophilasupporting

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Meiotic Sex Chromosome Inactivation in Drosophila

Vibranovski¹

2014

J. Genomics

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“…Another peculiarity is the spontaneous occurrence of recombination in males of species with a high degree of polymorphism for paracentric inversions, such as D. melanogaster [10], Drosophila ananassae Doleschall, 1858 [11], and D. willistoni [12].…”

Section: Introductionmentioning

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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Status of research on Drosophila ananassae at global level

Singh

Yadav

2015

J Genet

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Drosophila, a dipteran insect, has been found to be the best biological model for different kinds of studies. D melanogaster was first described by Meigen in 1830 , is most extensively studied species of the genus Drosophila and a number of investigations employing this species have been documented in areas such as genetics, behaviour, evolution, development, molecular biology, ecology, population biology, etc. Besides D. melanogaster, a number of other species of the genus Drosophila have also been used for different kinds of investigations. Among these, D. ananassae, a cosmopolitan and domestic species endowed with several unusual genetic features, is noteworthy. Described for the first time from Indonesia (Doleschall 1858), this species is commonly distributed in India. Extensive research work on D. ananassae has been done by numerous researchers pertaining to cytology, genetics, mutagenesis, gene mapping, crossing-over in both sexes, population and evolutionary genetics,behaviour genetics, ecological genetics, sexual isolation, fluctuating asymmetry, trade-offs etc. Genome of D. ananassae has also been sequenced. The status of research on D. ananassae at global level is briefly described in this review. Bibliography on this species from different countries worldwide reveals that maximum contribution is from India.

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Crossing over does occur in males ofDrosophila ananassaefrom natural populations

Cited by 7 publications

References 20 publications

Meiotic Sex Chromosome Inactivation in Drosophila

Meiotic Sex Chromosome Inactivation in Drosophila

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

Status of research on Drosophila ananassae at global level

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