PMID- 9865785
OWN - NLM
STAT- MEDLINE
DCOM- 19990223
LR  - 20191102
IS  - 0967-3849 (Print)
IS  - 0967-3849 (Linking)
VI  - 6
IP  - 6
DP  - 1998 Sep
TI  - Chromosomal localization and heterochromatin association of ribosomal RNA gene 
      loci and silver-stained nucleolar organizer regions in salmonid fishes.
PG  - 463-71
AB  - Ribosomal RNA gene (rDNA) loci, including those of nucleolus-forming 18S, 5.8S 
      and 28S (major) and non-nucleolus-forming 5S (minor) rDNA, were assigned using 
      fluorescence in situ hybridization (FISH) to the embryonic chromosomes of rainbow 
      trout (Oncorhynchus mykiss), masu salmon (O. masou), brook trout (Salvelinus 
      fontinalis) and Japanese huchen (Hucho perryi). In these species, the minor rDNA 
      loci were located basically on 2-4 chromosome pairs, whereas the major rDNA loci 
      were found essentially on one chromosome pair, except for the brook trout. Its 
      major rDNA loci were dispersed on about half of the chromosome complement, 
      showing a considerable interindividual variation in the number and location. The 
      major and minor rDNA loci were separated onto different chromosomes in the 
      examined species, except for the rainbow trout, in which one chromosome pair had 
      tandemly aligned minor and major rDNA loci. Chromosome regions containing both 
      kinds of rDNA loci in each species were found to be stained with C-banding, 
      showing an association of these loci with heterochromatin. Comparison of the 
      assigned major rDNA loci and sequentially detected silver (Ag)-stained nucleolar 
      organizer regions (AgNORs) in all the species revealed a considerable 
      polymorphism in the number and size of AgNORs among or within those loci, 
      suggesting a possible inter- or intralocus inactivation of the major rDNAs.
FAU - Fujiwara, A
AU  - Fujiwara A
AD  - Laboratory of Cytogenetics, Graduate School of Environmental Earth Science, 
      Hokkaido University, Sapporo, Japan.
FAU - Abe, S
AU  - Abe S
FAU - Yamaha, E
AU  - Yamaha E
FAU - Yamazaki, F
AU  - Yamazaki F
FAU - Yoshida, M C
AU  - Yoshida MC
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 Primers)
RN  - 0 (DNA Probes)
RN  - 0 (Heterochromatin)
RN  - 0 (RNA, Ribosomal)
SB  - IM
MH  - Animals
MH  - Base Sequence
MH  - Chromosome Banding
MH  - *Chromosome Mapping
MH  - DNA Primers
MH  - DNA Probes
MH  - Heterochromatin/*metabolism
MH  - In Situ Hybridization, Fluorescence
MH  - Nucleolus Organizer Region/*genetics
MH  - RNA, Ribosomal/*genetics
MH  - Salmon/*genetics
MH  - Silver Staining
MH  - Species Specificity
EDAT- 1998/12/29 00:00
MHDA- 1998/12/29 00:01
CRDT- 1998/12/29 00:00
PHST- 1998/12/29 00:00 [pubmed]
PHST- 1998/12/29 00:01 [medline]
PHST- 1998/12/29 00:00 [entrez]
AID - 10.1023/a:1009200428369 [doi]
PST - ppublish
SO  - Chromosome Res. 1998 Sep;6(6):463-71. doi: 10.1023/a:1009200428369.