Journal
CYTOGENETIC AND GENOME RESEARCH
Volume 125, Issue 3, Pages 224-234Publisher
KARGER
DOI: 10.1159/000230006
Keywords
Chromosome evolution; Cichlidae; Cytogenetics; Evolution; Genome; Heterochromatin; Transposons
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Funding
- FAPESP (Fundacao de Amparo a Pesquisa do Estado de Sao Paulo)
- FAPEMAT (Fundacao de Amparo a Pesquisa do Estado de Mato Grosso)
- CNPq (Conselho Nacional de Desenvolvimento Cientifico e Tecnologico)
- CAPES (Coordenacao de Aperfeicoamento de Pessoal de Nivel Superior)
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Repeated DNA elements have been extensively applied as physical chromosome markers in comparative studies for the identification of chromosomal rearrangements, the identification of sex chromosomes, chromosome evolution analysis and applied genetics. Here, we report the characterization of the transposable elements (TE) Tc1, Rex1, Rex3 and Rex6 and a new element called RCk in the genome of the South American cichlid fish Cichla kelberi using nucleotide sequence analysis and hybridization to metaphase chromosomes. The analysis of the repeated elements demonstrated that they are, in most cases, compartmentalized in heterochromatic regions, as has been observed in several other vertebrates. On the other hand, the elements Rex1 and Rex3 were also observed spanning extensive euchromatic regions on 2 chromosome pairs. The RCk element exhibits a wide distribution among fishes and also in amphibians, and it was spread throughout the chromosomes of C. kelberi. Our results have demonstrated that the compartmentalization of repeated elements is not restricted to heterochromatic segments, which has provided new concepts with regard to the genomic organization of transposons. Copyright (C) 2009 S. Karger AG, Basel
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