PMID- 8817071
OWN - NLM
STAT- MEDLINE
DCOM- 19961127
LR  - 20191101
IS  - 0967-3849 (Print)
IS  - 0967-3849 (Linking)
VI  - 4
IP  - 4
DP  - 1996 Jun
TI  - Fluorescence in situ hybridization with rDNA probes on chromosomes of two 
      nucleolus organizer region phenotypes of a species of Eigenmannia (Pisces, 
      Gymnotoidei, Sternopygidae).
PG  - 301-5
AB  - Nucleolus organizer regions (NORs) were analysed in two related and 
      geographically close populations of Eigenmannia sp.1 (Pisces, Gymnotoidei, 
      Sternopygidae) using silver staining and fluorescence in situ hybridization 
      (FISH). The two populations differed in their Ag-NOR phenotypes, displaying fixed 
      differences in the NOR-bearing chromosome pairs. FISH with rDNA probes showed 
      that these differences were due to the location of rDNA cistrons. This finding, 
      showing fixed NOR differences between two populations belonging to the same 
      species in a connected river system, is highly significant in terms of 
      evolutionary change, possibly indicating an initial step of genetic 
      differentiation. This result also has important implications from the 
      cytosystematic point of view, as NORs usually have a very constant karyotypic 
      location in fish species and have been used as species-specific chromosome 
      markers.
FAU - de Almeida-Toledo, L F
AU  - de Almeida-Toledo LF
AD  - Departamento de Biologia, Universidade de Sao Paulo, Brazil.
FAU - Stocker, A J
AU  - Stocker AJ
FAU - Foresti, F
AU  - Foresti F
FAU - Toledo-Filho, S de A
AU  - Toledo-Filho Sde A
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Netherlands
TA  - Chromosome Res
JT  - Chromosome research : an international journal on the molecular, supramolecular 
      and evolutionary aspects of chromosome biology
JID - 9313452
RN  - 0 (DNA Probes)
RN  - 0 (DNA, Ribosomal)
SB  - IM
MH  - Animals
MH  - Brazil
MH  - Chromosome Banding
MH  - *DNA Probes
MH  - *DNA, Ribosomal
MH  - Electric Fish/*genetics
MH  - Female
MH  - In Situ Hybridization, Fluorescence/*methods
MH  - Karyotyping
MH  - Male
MH  - Nucleolus Organizer Region/*genetics
MH  - Phenotype
EDAT- 1996/06/01 00:00
MHDA- 1996/06/01 00:01
CRDT- 1996/06/01 00:00
PHST- 1996/06/01 00:00 [pubmed]
PHST- 1996/06/01 00:01 [medline]
PHST- 1996/06/01 00:00 [entrez]
AID - 10.1007/BF02263681 [doi]
PST - ppublish
SO  - Chromosome Res. 1996 Jun;4(4):301-5. doi: 10.1007/BF02263681.