Conserved 5S and variable 45S rDNA chromosomal localisation revealed by FISH in Astyanax scabripinnis (Pisces, Characidae)

被引:0
|
作者
Monique Mantovani
Luciano Douglas dos
Santos Abel
Orlando Moreira-Filho
机构
[1] Universidade Federal de São Carlos,Departamento de Genética e Evolução
来源
Genetica | 2005年 / 123卷
关键词
double FISH; fluorescence ; hybridisation (FISH); karyotype evolution; nucleus functional compartmentalisation; ribosomal DNAs;
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学科分类号
摘要
Fluorescence in situhybridisation (FISH) and double FISH experiments were carried out to ascertain the chromosomal distribution pattern of the 45S and 5S ribosomal (r) DNAs in four populations of the characid fish Astyanax scabripinnis – a group considered to be a species complex for its wide karyotypical and morphological diversity. The results regarding the 45S rDNA agreed with this hypothesis, since these sites showed intra- and inter-populational, numerical and positional variations. However, the data obtained with the 5S rDNA probe revealed a highly conserved chromosomal distribution pattern of these sequences among individuals of each population, as well as among the populations analysed. We consider this contrasting situation as a functional divergence between 45S and 5S ribosomal DNAs, which may reflect the localisation of these sequences in distinct nuclear compartments, leading them to undergo differentiated evolutionary processes.
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页码:211 / 216
页数:5
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