Cargando…
Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura)
BACKGROUND: The combination of classical cytogenetics with molecular techniques represents a powerful approach for the comparative analysis of the genome, providing data for the systematic identification of chromosomal homologies among species and insights into patterns of chromosomal evolution with...
Autores principales: | , , , , |
---|---|
Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2014
|
Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3975639/ https://www.ncbi.nlm.nih.gov/pubmed/24602295 http://dx.doi.org/10.1186/1755-8166-7-22 |
_version_ | 1782310174062542848 |
---|---|
author | Bruschi, Daniel Pacheco Rivera, Miryan Lima, Albertina Pimentel Zúñiga, Ailín Blasco Recco-Pimentel, Shirlei Maria |
author_facet | Bruschi, Daniel Pacheco Rivera, Miryan Lima, Albertina Pimentel Zúñiga, Ailín Blasco Recco-Pimentel, Shirlei Maria |
author_sort | Bruschi, Daniel Pacheco |
collection | PubMed |
description | BACKGROUND: The combination of classical cytogenetics with molecular techniques represents a powerful approach for the comparative analysis of the genome, providing data for the systematic identification of chromosomal homologies among species and insights into patterns of chromosomal evolution within phylogenetically related groups. Here, we present cytogenetic data on four species of Neotropical treefrogs of the genus Phyllomedusa (P. vaillantii, P. tarsius, P. distincta, and P. bahiana), collected in Brazil and Ecuador, with the aim of contributing to the understanding of the chromosomal diversification of this genus. RESULTS: With the exception of P. tarsius, which presented three telocentric pairs, all the species analyzed had conservative karyotypic features. Heterochromatic patterns in the genomes of these species revealed by C-banding and fluorochrome staining indicated the presence of a large number of non-centromeric blocks. Using the Ag-NOR method and FISH with an rDNA 28S probe, we detected NOR in the pericentromeric region of the short arm of pair 7 in P. vaillantii, pair 1 in P. tarsius, chromosomes 1 and 9 in P. distincta, and in chromosome 9 in P. bahiana, in addition to the presence of NOR in one homologue of chromosome pair 10 in some individuals of this species. As expected, the telomeric probe detected the terminal regions of the chromosomes of these four species, although it also detected Interstitial Telomeric Sequences (ITS) in some chromosomes of the P. vaillantii, P. distincta and P. bahiana karyotypes. CONCLUSION: A number of conservative chromosomal structures permitted the recognition of karyotypic homologies. The data indicate that the presence of a NOR-bearing chromosome in pair 9 is the plesiomorphic condition in the P. burmeisteri group. The interspecific and intraspecific variation in the number and location of rDNA sites reflects the rapid rate of evolution of this character in Phyllomedusa. The ITS detected in this study does not appear to be a remnant of structural chromosome rearrangements. Telomeric repeats were frequently found in association with heterochromatin regions, primarily in the centromeres, which suggests that (TTAGGG)n repeats might be an important component of this heterochromatin. We propose that the ITSs originated independently during the chromosomal evolution of these species and may provide important insights into the role of these repeats in vertebrate karyotype diversification. |
format | Online Article Text |
id | pubmed-3975639 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2014 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-39756392014-04-05 Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura) Bruschi, Daniel Pacheco Rivera, Miryan Lima, Albertina Pimentel Zúñiga, Ailín Blasco Recco-Pimentel, Shirlei Maria Mol Cytogenet Research BACKGROUND: The combination of classical cytogenetics with molecular techniques represents a powerful approach for the comparative analysis of the genome, providing data for the systematic identification of chromosomal homologies among species and insights into patterns of chromosomal evolution within phylogenetically related groups. Here, we present cytogenetic data on four species of Neotropical treefrogs of the genus Phyllomedusa (P. vaillantii, P. tarsius, P. distincta, and P. bahiana), collected in Brazil and Ecuador, with the aim of contributing to the understanding of the chromosomal diversification of this genus. RESULTS: With the exception of P. tarsius, which presented three telocentric pairs, all the species analyzed had conservative karyotypic features. Heterochromatic patterns in the genomes of these species revealed by C-banding and fluorochrome staining indicated the presence of a large number of non-centromeric blocks. Using the Ag-NOR method and FISH with an rDNA 28S probe, we detected NOR in the pericentromeric region of the short arm of pair 7 in P. vaillantii, pair 1 in P. tarsius, chromosomes 1 and 9 in P. distincta, and in chromosome 9 in P. bahiana, in addition to the presence of NOR in one homologue of chromosome pair 10 in some individuals of this species. As expected, the telomeric probe detected the terminal regions of the chromosomes of these four species, although it also detected Interstitial Telomeric Sequences (ITS) in some chromosomes of the P. vaillantii, P. distincta and P. bahiana karyotypes. CONCLUSION: A number of conservative chromosomal structures permitted the recognition of karyotypic homologies. The data indicate that the presence of a NOR-bearing chromosome in pair 9 is the plesiomorphic condition in the P. burmeisteri group. The interspecific and intraspecific variation in the number and location of rDNA sites reflects the rapid rate of evolution of this character in Phyllomedusa. The ITS detected in this study does not appear to be a remnant of structural chromosome rearrangements. Telomeric repeats were frequently found in association with heterochromatin regions, primarily in the centromeres, which suggests that (TTAGGG)n repeats might be an important component of this heterochromatin. We propose that the ITSs originated independently during the chromosomal evolution of these species and may provide important insights into the role of these repeats in vertebrate karyotype diversification. BioMed Central 2014-03-06 /pmc/articles/PMC3975639/ /pubmed/24602295 http://dx.doi.org/10.1186/1755-8166-7-22 Text en Copyright © 2014 Bruschi et al.; licensee BioMed Central Ltd. http://creativecommons.org/licenses/by/2.0 This is an Open Access article distributed under the terms of the Creative Commons Attribution License (http://creativecommons.org/licenses/by/2.0), which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly credited. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Bruschi, Daniel Pacheco Rivera, Miryan Lima, Albertina Pimentel Zúñiga, Ailín Blasco Recco-Pimentel, Shirlei Maria Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura) |
title | Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura) |
title_full | Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura) |
title_fullStr | Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura) |
title_full_unstemmed | Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura) |
title_short | Interstitial Telomeric Sequences (ITS) and major rDNA mapping reveal insights into the karyotypical evolution of Neotropical leaf frogs species (Phyllomedusa, Hylidae, Anura) |
title_sort | interstitial telomeric sequences (its) and major rdna mapping reveal insights into the karyotypical evolution of neotropical leaf frogs species (phyllomedusa, hylidae, anura) |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC3975639/ https://www.ncbi.nlm.nih.gov/pubmed/24602295 http://dx.doi.org/10.1186/1755-8166-7-22 |
work_keys_str_mv | AT bruschidanielpacheco interstitialtelomericsequencesitsandmajorrdnamappingrevealinsightsintothekaryotypicalevolutionofneotropicalleaffrogsspeciesphyllomedusahylidaeanura AT riveramiryan interstitialtelomericsequencesitsandmajorrdnamappingrevealinsightsintothekaryotypicalevolutionofneotropicalleaffrogsspeciesphyllomedusahylidaeanura AT limaalbertinapimentel interstitialtelomericsequencesitsandmajorrdnamappingrevealinsightsintothekaryotypicalevolutionofneotropicalleaffrogsspeciesphyllomedusahylidaeanura AT zunigaailinblasco interstitialtelomericsequencesitsandmajorrdnamappingrevealinsightsintothekaryotypicalevolutionofneotropicalleaffrogsspeciesphyllomedusahylidaeanura AT reccopimentelshirleimaria interstitialtelomericsequencesitsandmajorrdnamappingrevealinsightsintothekaryotypicalevolutionofneotropicalleaffrogsspeciesphyllomedusahylidaeanura |