NDLI: Variable B chromosomes frequencies between males and females of two species of pufferfishes (Tetraodontiformes)

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Variable B chromosomes frequencies between males and females of two species of pufferfishes (Tetraodontiformes)

Content Provider	Springer Nature Link
Author	leto, Rafael Bue Vicari, Marcelo Ricardo Cestari, Marta Margarete Artoni, Roberto Ferreira
Copyright Year	2011
Abstract	Cytogenetic analysis in two sympatric species of pufferfish from Paraná Coast, Brazil, Sphoeroides spengleri (Tetraodontidae) and Chilomycterus spinosus (Diodontidae) revealed the presence of 2n = 46 and 2n = 50 chromosomes, respectively. In S. spengleri, the double FISH technique with 5S and 18S rDNA probes showed no syntenical organization, with both multigene families occupying a terminal position on the chromosomes. In S. spengleri the poor pattern of heterochromatin distribution is discussed about its relation with the compactness of their genome. On the other hand C. spinosus presented conspicuous blocks occupying the short arms of several chromosomes, possibly consequence of an accumulative process. Heterochromatic supernumerary chromosomes were detected in both species, however in S. spengleri they were presented as microchromosomes varying of 0–3 and being more frequent in females than in males, possibly as result of a preferential segregation. Conversely in C. spinosus an extra chromosome was restricted to the males, which to behave as univalent during meiosis. In view of these peculiarities we hypothesized a possible relationship between B chromosome and sex determination, although others aspects on accumulation, maintenance, and frequency of these extra elements were also considered, focusing on the parasitic model. In spite of the karyotypic diversity and others genetic peculiarities in Tetraodontiformes, this corresponds the third report of the occurrence of chromosomes B in the group.
Starting Page	343
Ending Page	349
Page Count	7
File Format	PDF
ISSN	09603166
Journal	Reviews in Fish Biology and Fisheries
Volume Number	22
Issue Number	1
e-ISSN	15735184
Language	English
Publisher	Springer Netherlands
Publisher Date	2011-08-05
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Diodontidae Tetraodontidae B chromosomes Pufferfish Zoology Freshwater & Marine Ecology
Content Type	Text
Resource Type	Article
Subject	Aquatic Science

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