NDLI: Diversification of a ZZ/ZW sex chromosome system in Characidium fish (Crenuchidae, Characiformes)

Content Provider	Springer Nature Link
Author	Vicari, Marcelo Ricardo Artoni, Roberto Ferreira Moreira Filho, Orlando Bertollo, Luiz Antonio Carlos
Copyright Year	2008
Abstract	Karyotype and other chromosomal markers of Characidium cf. gomesi were analyzed using conventional (Giemsa-staining, Ag-NOR and C-banding) and molecular (Fluorescent in situ hybridization (FISH) with 18S and 5S rDNA biotinylated probes) techniques. Both sexes had invariably diploid chromosome number 2n = 50 while karyotypes of males and females differed. That of male consisted of 32 metacentric + 18 submetacentric chromosomes and that of female consisted 31 metacentric + 18 submetacentric + 1 subtelocentric chromosomes. The Z chromosome was medium-sized metacentric, while W was highly heterochromatinized subtelocentric element. NORs as revealed by Ag-staining were situated at 2–7 telomeric regions while FISH with 18S probes showed consistently 10 signals at telomeric regions. FISH with 5S rDNA probe showed constantly signals at one metacentric pair. Distribution of centromeric heterochromatin was mostly in all chromosome pairs, besides some telomeric sites. The common origin of the sex chromosome system of ZZ/ZW type in the karyotypes of other representatives of the genus analyzed so far might be hypothesized based on biogeography and partial phylogeny of the group.
Starting Page	311
Ending Page	317
Page Count	7
File Format	PDF
ISSN	00166707
Journal	Genetica
Volume Number	134
Issue Number	3
e-ISSN	15736857
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-01-04
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Chromosome banding Karyotype differentiation Cytotaxonomy of Characidium Ribosomal genes FISH Microbial Genetics and Genomics Human Genetics Plant Genetics & Genomics Animal Genetics and Genomics Life Sciences
Content Type	Text
Resource Type	Article
Subject	Genetics Plant Science Medicine Animal Science and Zoology Insect Science

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