title: Cytogenetic Diversity and the Evolutionary Dynamics of rDNA Genes and Telomeric Sequences in the Ancistrus Genus (Loricariidae: Ancistrini).
abstract: 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.
authors.affiliation: 1 Programa de Pós-Graduação em Genética, Conservação e Biologia Evolutiva, Instituto Nacional de Pesquisas da Amazônia , Manaus, Brazil .
authors.forename: Ramon Marin
authors.initials: RM
authors.lastname: Favarato
authors.affiliation: 1 Programa de Pós-Graduação em Genética, Conservação e Biologia Evolutiva, Instituto Nacional de Pesquisas da Amazônia , Manaus, Brazil .
authors.forename: Maelin da
authors.initials: Md
authors.lastname: Silva
authors.affiliation: 2 Coordenação de Biodiversidade, Programa de Pós-Graduação em Biologia de Água Doce e Pesca Interior, Instituto Nacional de Pesquisas da Amazônia , Manaus, Brazil .
authors.forename: Renildo Ribeiro de
authors.initials: RR
authors.lastname: Oliveira
authors.affiliation: 3 Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa , Ponta Grossa, Brazil .
authors.forename: Roberto Ferreira
authors.initials: RF
authors.lastname: Artoni
authors.affiliation: 1 Programa de Pós-Graduação em Genética, Conservação e Biologia Evolutiva, Instituto Nacional de Pesquisas da Amazônia , Manaus, Brazil .
authors.forename: Eliana
authors.initials: E
authors.lastname: Feldberg
authors.affiliation: 4 Departamento de Genética, Instituto de Ciências Biológicas, Universidade Federal do Amazonas , Manaus, Brazil .
authors.forename: Daniele Aparecida
authors.initials: DA
authors.lastname: Matoso
mesh_terms: D000818:Animals; D002397:Catfishes / Q000235:genetics*; D019143:Evolution, Molecular; D005260:Female; D059785:Karyotype; D008297:Male; D012337:RNA, Ribosomal, 18S / Q000235:genetics*; D012341:RNA, Ribosomal, 5S / Q000235:genetics*; D016615:Telomere
chemical_list: D012337:RNA, Ribosomal, 18S; D012341:RNA, Ribosomal, 5S