期刊
ZEBRAFISH
卷 13, 期 2, 页码 103-111出版社
MARY ANN LIEBERT, INC
DOI: 10.1089/zeb.2015.1140
关键词
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资金
- Conselho Nacional de Pesquisa e Desenvolvimento Tecnologico (CNPq)
- Instituto Nacional de Pesquisas da Amazonia/PPG Genetica
- Conservacao e Biologia Evolutiva (INPA/GCBEv)
- Fundacao de Amparo a Pesquisas do Estado do Amazonas (PRONEX FAPEAM/CNPq)
- Center for Studies of Adaptation to Environmental Changes in the Amazon (INCT ADAPTA, FAPEAM/CNPq) [573976/2008-2]
The Ancistrus genus differs from other Ancistrini due to its wide karyotypic diversity, varied diploid numbers, differences in sex chromosomes, and large number of species, as well as its tendency to form small populations with low vagility. This study investigated the role of 5S and 18S rDNA and telomeric repetitive sequences in the evolution of the karyotypic macrostructure of seven species of the genus Ancistrus from the Central Amazon. The results indicate a strong correlation between the location of ribosomal sites and fragile sites in the genome, particularly of 5S rDNA sequences, which are associated, in some species, with telomeric sequences at the sites of chromosomal healing. Moreover, the occurrence of two lineages was observed with regard to the synteny of ribosomal genes. The species of the genus Ancistrus showed high chromosomal lability associated with breakpoints, which was characterized by the presence of repetitive DNA sequences and this process is suggested to be an evolutionary model for the rapid fixation of structural rearrangements.
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