Cytogenetics of bisexual/unisexual species of &lt;i&gt;Poecilia&lt;/i&gt;

Sola, Luciana; Rossi, Anna Rita; Iaselli, V.; Rasch, Ellen M.; Monaco, Paul J.

doi:10.1159/000133346

Cited by 161 publications

(30 citation statements)

References 12 publications

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“…On the other hand, in M. edulis an alike variation was found using another banding method (DIXON et al 1986;DIXON and McFADZEN 1987). A similar behaviour could be deduced from the C-banding and Agstaining patterns of a cyprinodont fish, Poecilia latipinna (SoLA et al 1990), because when variable numbers of C-positive regions (6 to 13) were found in a population those regions were coincident with the NORs.…”

Section: Nor-associated Heterochromatic Regionssupporting

confidence: 60%

“…On the other hand, the existence of some regions which do not C-band but are visibly heteropycnotic in the manner expected of heterochromatin, indicates that all C-bands correspond to heterochromatin but some heterochromatin is not stained by C-banding methods (SuMNER 1990). Anyway, the C-banding techni-que demonstrated that heterochromatin is subject to both qualitative and quantitative variation as well as to changes in location both within and between species (JoHN 1981;SENTis et al 1986;JoHN 1988;SoLA et al 1990;SuMNER 1990).…”

Section: Introductionmentioning

confidence: 99%

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C-band polymorphism in the chromosomes of the musselMytilus galloprovincialisLmk.

1996

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SUMMARY -The chromosomes of 346 specimens of Mytilus galloprovincialis, collected at four NW Iberian peninsula sites, were studied using a C-banding technique. Polymorphism for C-banding was detected. According to the banding patterns, three classes of mussels could be distinguished: 1) individuals showing two pairs of submeta/subtelocentric chromosomes bearing NOR-associated heterochromatic regions terminal to their long arms, 2) mussels presenting additional C-bands located at other positions on the NOR-bearing chromosomes or on other chromosomes, and 3) mosaic mussels. The location of the additional C-band positive regions was similar in the four populations studied.

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Section: Nor-associated Heterochromatic Regionssupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

C-band polymorphism in the chromosomes of the musselMytilus galloprovincialisLmk.

1996

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“…Ribosomal gene location polymorphism has also been seen in the gray tree frog (Hyla chrysoscelis-H. versicolor complex (Wiley et al, 1989]), as well as in a number of diverse organisms, e.g., onions (Shubert and Wobus, 1985), fish (Sola et al, 1990), and salamanders (Nardi et al, 1977). Although it is tempting to believe, based on the phylogenetic diversity of these reports, that this polymorphism is a common occurrence in eukaryotes, the general paucity of findings tends to discount that view.…”

Section: Resultsmentioning

confidence: 99%

Ribosomal RNA gene site polymorphism in <i>Bufo terrestris</i>

Foote

Wiley²,

Little³

et al. 1991

Cytogenet Genome Res

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Individual specimens of Bufo terrestris were discovered that possessed ribosomal gene locations in addition to those normally found. Every specimen from an island population that was examined had extra sites, whereas fewer individuals from coastal mainland populations and none from inland populations had them. Although the extra ribosomal gene locations probably did not arise through gross structural chromosome rearrangements, their origin remains unclear.

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“…Subsequently, chromosomes were destained by incubation in fixative for 3 min at RT and briefly washed by distilled water. After air-drying, CMA 3 and DAPI fluorescent staining was performed sensu Sola et al [49]. Finally, the AgNO 3 staining sensu Howell and Black [50] and C-banding sensu Haaf and Schmid [51] were performed.…”

Section: Methodsmentioning

confidence: 99%

Molecular cytogenetic differentiation of paralogs of Hox paralogs in duplicated and re-diploidized genome of the North American paddlefish (Polyodon spathula)

et al. 2017

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Background: Acipenseriformes is a basal lineage of ray-finned fishes and comprise 27 extant species of sturgeons and paddlefishes. They are characterized by several specific genomic features as broad ploidy variation, high chromosome numbers, presence of numerous microchromosomes and propensity to interspecific hybridization. The presumed palaeotetraploidy of the American paddlefish was recently validated by molecular phylogeny and Hox genes analyses. A whole genome duplication in the paddlefish lineage was estimated at approximately 42 Mya and was found to be independent from several genome duplications evidenced in its sister lineage, i.e. sturgeons. We tested the ploidy status of available chromosomal markers after the expected rediploidization. Further we tested, whether paralogs of Hox gene clusters originated from this paddlefish specific genome duplication are cytogenetically distinguishable. Results: We found that both paralogs HoxA alpha and beta were distinguishable without any overlapping of the hybridization signal -each on one pair of large metacentric chromosomes. Of the HoxD, only the beta paralog was unequivocally identified, whereas the alpha paralog did not work and yielded only an inconclusive diffuse signal. Chromosomal markers on three diverse ploidy levels reflecting different stages of rediploidization were identified: quadruplets retaining their ancestral tetraploid condition, semi-quadruplets still reflecting the ancestral tetraploidy with clear signs of advanced rediploidization, doublets were diploidized with ancestral tetraploidy already blurred. Also some of the available microsatellite data exhibited diploid allelic band patterns at their loci whereas another locus showed more than two alleles. Conclusions: Our exhaustive staining of paddlefish chromosomes combined with cytogenetic mapping of ribosomal genes and Hox paralogs and with microsatellite data, brings a closer look at results of the process of rediploidization in the course of paddlefish genome evolution. We show a partial rediploidization represented by a complex mosaic structure comparable with segmental paleotetraploidy revealed in sturgeons (Acipenseridae). Sturgeons and paddlefishes with their high propensity for whole genome duplication thus offer suitable animal model systems to further explore evolutionary processes that were shaping the early evolution of all vertebrates.

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Cytogenetics of bisexual/unisexual species of <i>Poecilia</i>

Cited by 161 publications

References 12 publications

C-band polymorphism in the chromosomes of the musselMytilus galloprovincialisLmk.

C-band polymorphism in the chromosomes of the musselMytilus galloprovincialisLmk.

Ribosomal RNA gene site polymorphism in <i>Bufo terrestris</i>

Molecular cytogenetic differentiation of paralogs of Hox paralogs in duplicated and re-diploidized genome of the North American paddlefish (Polyodon spathula)

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