Document Detail

Similarities in the chromosomal distribution of AG and AC repeats within and between Drosophila, human and barley chromosomes.
MedLine Citation:
PMID:  18160787     Owner:  NLM     Status:  MEDLINE    
Two simple sequence repeats (SSRs), AG and AC, were mapped directly in the metaphase chromosomes of man and barley (Hordeum vulgare L.), and in the metaphase and polytene chromosomes of Drosophila melanogaster. To this end, synthetic oligonucleotides corresponding to (AG)(12) and (AC)(8) were labelled by the random primer technique and used as probes in fluorescent in situ hybridisation (FISH) under high stringency and strict washing conditions. The distribution and intensity of the signals for the repeat sequences were found to be characteristic of the chromosomes and genomes of the three species analysed. The AC repeat sites were uniformly dispersed along the euchromatic segments of all three genomes; in fact, they were largely excluded from the heterochromatin. The Drosophila genome showed a high density of AC sequences on the X chromosome in both mitotic and polytene nuclei. In contrast, the AG repeats were associated with the euchromatic regions of the polytene chromosomes (and in high density on the X chromosome), but were only seen in specific heterochromatic regions in the mitotic chromosomes of all three species. In Drosophila, the AG repeats were exclusively distributed on the tips of the Y chromosome and near the centromere on both arms of chromosome 2. In barley and man, AG repeats were associated with the centromeres (of all chromosomes) and nucleolar organizer regions, respectively. The conserved chromosome distribution of AC within and between these three phylogenetically distant species, and the association of AG in specific chromosome regions with structural or functional properties, suggests that long clusters of these repeats may have some, as yet unknown, role.
A Cuadrado; N Jouve
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't     Date:  2007-12-14
Journal Detail:
Title:  Cytogenetic and genome research     Volume:  119     ISSN:  1424-859X     ISO Abbreviation:  Cytogenet. Genome Res.     Publication Date:  2007  
Date Detail:
Created Date:  2007-12-27     Completed Date:  2008-01-18     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101142708     Medline TA:  Cytogenet Genome Res     Country:  Switzerland    
Other Details:
Languages:  eng     Pagination:  91-9     Citation Subset:  IM    
Copyright Information:
Copyright (c) 2007 S. Karger AG, Basel.
Department of Cell Biology and Genetics, University of Alcalá, Madrid, Spain.
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MeSH Terms
Base Sequence
Chromosomes / genetics*
Drosophila melanogaster / genetics*
Hordeum / genetics*
Tandem Repeat Sequences / genetics*

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