NDLI: Astyanax bockmanni Vari and Castro, 2007: an ambiguous karyotype in the Astyanax genus

Content Provider	Springer Nature Link
Author	Kavalco, Karine Frehner Pazza, Rubens Almeida Toledo, Lurdes Foresti
Copyright Year	2008
Abstract	Despite the widespread distribution of Astyanax bockmanni in streams from Upper Paraná River system in central, southeastern, and southern Brazil, just recently, it has been identified as a distinct Astyanax species. Cytogenetic studies were performed in two populations of this species, revealing conservative features. A. bockmanni shows 2n = 50 chromosomes, a karyotypic formula composed of 10 M + 12SM + 12ST + 16A and multiple Ag-NORs. Eight positive signals in subtelocentric/acrocentric chromosomes were identified by fluorescent in situ hybridization (FISH) with 18S rDNA probes. After FISH with 5S rDNA probes, four sites were detected, comprising the interstitial region of a metacentric pair and the terminal region on long arms of another metracentric pair. Little amounts of constitutive heterochromatin were observed, mainly distributed at distal region in two chromosomal pairs. Additionally, heterochromatin was also located close to the centromeres in some chromosomes. No positive signals were detected in the chromosomes of A. bockmanni by FISH with the As-51 satellite DNA probe. The studied species combines a set of characteristics previously identified in two different Astyanax groups. The chromosomal evolution in the genus Astyanax is discussed.
Starting Page	135
Ending Page	139
Page Count	5
File Format	PDF
ISSN	00166707
Journal	Genetica
Volume Number	136
Issue Number	1
e-ISSN	15736857
Language	English
Publisher	Springer Netherlands
Publisher Date	2008-09-30
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Astyanax bockmanni Molecular cytogenetics FISH Karyotypical evolution 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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