PMID- 7924619
OWN - NLM
STAT- MEDLINE
DCOM- 19941110
LR  - 20190830
IS  - 0009-5915 (Print)
IS  - 0009-5915 (Linking)
VI  - 103
IP  - 3
DP  - 1994 Jun
TI  - Multiplication of 28S rDNA and NOR activity in chromosome evolution among ants of 
      the Myrmecia pilosula species complex.
PG  - 171-8
AB  - Chromosomal localization of rDNA in samples of five taxa of the Mymecia pilosula 
      species complex (Hymenoptera: Formicidae: Myrmeciinae) with 2n = 3 (M. 
      croslandi), 8 (M. imaii), 10 (M. banksi), 18 (M. haskinsorum), and 27 (M. 
      pilosula) was carried out by fluorescence in situ hybridization (FISH) using 
      cloned M. croslandi rDNA (pMc.r2) including the coding region for 28S rRNA. 
      Results show that (1) the 28S rDNA in the genome of these ants is repetitive and 
      is localized in pericentromeric C-bands, (2) the number of chromosomes carrying 
      rDNA is two in M. croslandi, M. imaii and M. banksi, six in M. haskinsorum and 
      ten in M. pilosula, and (3) only one or two clusters of rRNA genes generate 
      nucleoli in each species. We suggest that the rDNA in the ancestral stock of the 
      M. pilosula complex was localized originally in a pericentromeric C-band, and 
      multiplied by chance with time during saltatory increases in C-banding following 
      episodes of centric fission. Most rDNA multiplied on various chromosomes seems to 
      be inactivated and eliminated from the genome, together with C-bands, by 
      AM-inversion or centric fusion, with the remnant rDNAs dispersed in the genome by 
      centric fission and AM-inversion.
FAU - Hirai, H
AU  - Hirai H
AD  - Primate Research Institute, Kyoto University, Aichi-ken, Japan.
FAU - Yamamoto, M T
AU  - Yamamoto MT
FAU - Ogura, K
AU  - Ogura K
FAU - Satta, Y
AU  - Satta Y
FAU - Yamada, M
AU  - Yamada M
FAU - Taylor, R W
AU  - Taylor RW
FAU - Imai, H T
AU  - Imai HT
LA  - eng
PT  - Journal Article
PT  - Research Support, Non-U.S. Gov't
PL  - Austria
TA  - Chromosoma
JT  - Chromosoma
JID - 2985138R
RN  - 0 (DNA, Ribosomal)
RN  - 0 (RNA, Ribosomal, 28S)
SB  - IM
MH  - Animals
MH  - Ants/*genetics
MH  - *Biological Evolution
MH  - Chromosome Banding
MH  - Chromosome Mapping
MH  - Chromosomes/genetics
MH  - Cloning, Molecular
MH  - DNA, Ribosomal/*genetics
MH  - Gene Dosage
MH  - Genes, Insect/genetics
MH  - In Situ Hybridization, Fluorescence
MH  - Models, Genetic
MH  - Nucleolus Organizer Region/*genetics
MH  - RNA, Ribosomal, 28S/*genetics
EDAT- 1994/06/01 00:00
MHDA- 1994/06/01 00:01
CRDT- 1994/06/01 00:00
PHST- 1994/06/01 00:00 [pubmed]
PHST- 1994/06/01 00:01 [medline]
PHST- 1994/06/01 00:00 [entrez]
AID - 10.1007/BF00368009 [doi]
PST - ppublish
SO  - Chromosoma. 1994 Jun;103(3):171-8. doi: 10.1007/BF00368009.