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Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil

Abstract. Populations of seven Ancistrus species were analyzed from streams and rivers of three hydrographic Brazilian basins. All populations showed different diploid numbers (2n), fundamental numbers (FNs), and karyotypes. Some representatives of Loricariidae have 2n = 54 chromosomes, which is ver...

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Autores principales: Mariotto, Sandra, Centofante, Liano, Vicari, Marcelo Ricardo, Artoni, Roberto Ferreira, Moreira-Filho, Orlando
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Pensoft Publishers 2011
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3833787/
https://www.ncbi.nlm.nih.gov/pubmed/24260636
http://dx.doi.org/10.3897/CompCytogen.v5i4.1757
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author Mariotto, Sandra
Centofante, Liano
Vicari, Marcelo Ricardo
Artoni, Roberto Ferreira
Moreira-Filho, Orlando
author_facet Mariotto, Sandra
Centofante, Liano
Vicari, Marcelo Ricardo
Artoni, Roberto Ferreira
Moreira-Filho, Orlando
author_sort Mariotto, Sandra
collection PubMed
description Abstract. Populations of seven Ancistrus species were analyzed from streams and rivers of three hydrographic Brazilian basins. All populations showed different diploid numbers (2n), fundamental numbers (FNs), and karyotypes. Some representatives of Loricariidae have 2n = 54 chromosomes, which is very likely an ancestral cytotaxonomic characteristic, but many other representatives show extensive karyotype diversification. In the Ancistrus species studied, extensive karyotypic differentiation, which is generally associated with chromosome number reduction and rearrangement of the ribosomal RNA gene (rDNA) sites, was verified. Chromosomal locations of 18S and 5S rDNA were jointly detected using fluorescence in situ hybridization (FISH). In all the Ancistrus species analyzed, 18S rDNA sites were detected only on one chromosome pair, though this differed among species. 5S rDNA was located on 1–3 chromosome pairs either separately or in synteny with 18S rDNA in four of the seven species/populations. Hence the karyotype differentiation in Ancistrus species could be associated with a morphological speciation process, suggesting that chromosome fusions, inversions, deletions, duplications, and heterochromatination could contribute to the karyotype evolution of these neotropical armored catfishes.
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spelling pubmed-38337872013-11-20 Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil Mariotto, Sandra Centofante, Liano Vicari, Marcelo Ricardo Artoni, Roberto Ferreira Moreira-Filho, Orlando Comp Cytogenet Article Abstract. Populations of seven Ancistrus species were analyzed from streams and rivers of three hydrographic Brazilian basins. All populations showed different diploid numbers (2n), fundamental numbers (FNs), and karyotypes. Some representatives of Loricariidae have 2n = 54 chromosomes, which is very likely an ancestral cytotaxonomic characteristic, but many other representatives show extensive karyotype diversification. In the Ancistrus species studied, extensive karyotypic differentiation, which is generally associated with chromosome number reduction and rearrangement of the ribosomal RNA gene (rDNA) sites, was verified. Chromosomal locations of 18S and 5S rDNA were jointly detected using fluorescence in situ hybridization (FISH). In all the Ancistrus species analyzed, 18S rDNA sites were detected only on one chromosome pair, though this differed among species. 5S rDNA was located on 1–3 chromosome pairs either separately or in synteny with 18S rDNA in four of the seven species/populations. Hence the karyotype differentiation in Ancistrus species could be associated with a morphological speciation process, suggesting that chromosome fusions, inversions, deletions, duplications, and heterochromatination could contribute to the karyotype evolution of these neotropical armored catfishes. Pensoft Publishers 2011-11-09 /pmc/articles/PMC3833787/ /pubmed/24260636 http://dx.doi.org/10.3897/CompCytogen.v5i4.1757 Text en Sandra Mariotto, Liano Centofante, Marcelo Ricardo Vicari, Roberto Ferreira Artoni, Orlando Moreira-Filho http://creativecommons.org/licenses/by/3.0 This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
spellingShingle Article
Mariotto, Sandra
Centofante, Liano
Vicari, Marcelo Ricardo
Artoni, Roberto Ferreira
Moreira-Filho, Orlando
Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil
title Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil
title_full Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil
title_fullStr Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil
title_full_unstemmed Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil
title_short Chromosomal diversification in ribosomal DNA sites in Ancistrus Kner, 1854 (Loricariidae, Ancistrini) from three hydrographic basins of Mato Grosso, Brazil
title_sort chromosomal diversification in ribosomal dna sites in ancistrus kner, 1854 (loricariidae, ancistrini) from three hydrographic basins of mato grosso, brazil
topic Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3833787/
https://www.ncbi.nlm.nih.gov/pubmed/24260636
http://dx.doi.org/10.3897/CompCytogen.v5i4.1757
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