PMID- 9865784
OWN - NLM
STAT- MEDLINE
DCOM- 19990223
LR  - 20191102
IS  - 0967-3849 (Print)
IS  - 0967-3849 (Linking)
VI  - 6
IP  - 6
DP  - 1998 Sep
TI  - Heterogeneity and meiotic behaviour of B and sex chromosomes, banding patterns 
      and localization of (TTAGGG)n sequences by fluorescence in situ hybridization in 
      the neotropical water rat Nectomys (Rodentia, Cricetidae).
PG  - 455-62
AB  - A cytogenetic study using fluorescence in situ hybridization (FISH) of telomere 
      probes, CBG, GTG and RBG banding patterns and synaptonemal complex data was 
      carried out in 41 specimens of Nectomys from three Brazilian states: Pernambuco, 
      Mato Grosso and Sao Paulo. The specimens presented 2n = 52, 53, 56 and 57, and 
      the differences in chromosome number were due to the presence of three different 
      supernumeraries and also to the occurrence of tandem fusions. The tandem fusions 
      involved chromosome pairs 3 + 11 and 5 + 24 from karyotype with 2n = 56 that 
      originated pairs 1 and 4 in specimens with 2n = 52. Sex chromosome polymorphism 
      was also detected, and the X presented three different morphologies, which could 
      be explained by heterochromatin addition/deletion. FISH results revealed 
      interstitial telomeric bands (ITBs) in a submetacentric B, but no ITB was 
      detected in the chromosomes originated by tandem fusion. The supernumeraries 
      presented a remarkable heterogeneity of size and morphology, constitutive 
      heterochromatin pattern and localization of telomeric sequences. Synaptonemal 
      complex by light and electron microscopy showed the supernumerary as an 
      autopaired univalent. The sex chromosome pairing in meiotic cells involved the 
      heterochromatic short arm of the X chromosome and the short arm of the Y 
      chromosome.
FAU - de Jesus Silva, M J
AU  - de Jesus Silva MJ
AD  - Departamento de Biologia, Instituto de Biociencias, Universidade de Sao Paulo, 
      SP, Brazil. mailto:mariajo@usp.br
FAU - Yonenaga-Yassuda, Y
AU  - Yonenaga-Yassuda Y
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
SB  - IM
MH  - Animals
MH  - Arvicolinae/*genetics
MH  - Chromosome Banding
MH  - Female
MH  - *Genetic Heterogeneity
MH  - In Situ Hybridization, Fluorescence
MH  - Karyotyping
MH  - Male
MH  - Meiosis/*genetics
MH  - *Sex Chromosomes
MH  - Synaptonemal Complex
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:1009248311530 [doi]
PST - ppublish
SO  - Chromosome Res. 1998 Sep;6(6):455-62. doi: 10.1023/a:1009248311530.