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Nappi A, Brunet-Lecomte P, Montuire S. The systematics of Microtus (Terricola) savii group: an odonthometrical perspective (Mammalia, Rodentia, Cricetidae). J NAT HIST 2020. [DOI: 10.1080/00222933.2020.1758818] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
| | | | - Sophie Montuire
- Biogéosciences, UMR 6282 CNRS, Université Bourgogne Franche-Comté, Dijon, France
- EPHE, PSL University, Paris, France
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Milioto V, Vlah S, Mazzoleni S, Rovatsos M, Dumas F. Chromosomal Localization of 18S-28S rDNA and (TTAGGG)n Sequences in Two South African Dormice of the Genus Graphiurus (Rodentia: Gliridae). Cytogenet Genome Res 2019; 158:145-151. [PMID: 31234172 DOI: 10.1159/000500985] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 03/06/2019] [Indexed: 11/19/2022] Open
Abstract
Classical cytogenetics and mapping of 18S-28S rDNA and (TTAGGG)n sequences by fluorescence in situ hybridization (FISH) was performed on Graphiurus platyops (GPL) and Graphiurus ocularis (GOC) metaphases with the aim to characterize the genomes. In both species, inverted DAPI karyotypes showed the same diploid number, 2n = 46, and hybridization of the (TTAGGG)n probe revealed interstitial telomeric sequences (ITSs) at the centromeres of almost all bi-armed chromosomes. FISH with the rDNA probe localized nucleolus organizer regions (NORs), at the terminal ends of the p arms of the subtelocentric pairs 16 and 17 in both species and detected additional signals on GPL8 and GOC18, 19, and 22. The species have similar karyotypes, but their chromosome pairs 18-22 differ in morphology; these are acrocentric in G. platyops, as also confirmed by C-banding, and subtelocentric in G. ocularis. These differences in pairs 18-22 were also highlighted by hybridization of the telomeric probe (TTAGGG)n, which showed the small p arms in G. ocularis enriched with ITSs. FISH of rDNA probes detected multiple NOR loci in G. ocularis, underlining the intense evolutionary dynamics related to these genes. Although the Graphiurus species analyzed have similar karyotypes, the results on the repetitive sequences indicate a complex pattern of genomic reorganization and evolution occurring in these phylogenetically close species.
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Mazzoleni S, Rovatsos M, Schillaci O, Dumas F. Evolutionary insight on localization of 18S, 28S rDNA genes on homologous chromosomes in Primates genomes. COMPARATIVE CYTOGENETICS 2018; 12:27-40. [PMID: 29416829 PMCID: PMC5799724 DOI: 10.3897/compcytogen.v12i1.19381] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 07/24/2017] [Accepted: 11/24/2017] [Indexed: 06/08/2023]
Abstract
We explored the topology of 18S and 28S rDNA units by fluorescence in situ hybridization (FISH) in the karyotypes of thirteen species representatives from major groups of Primates and Tupaia minor (Günther, 1876) (Scandentia), in order to expand our knowledge of Primate genome reshuffling and to identify the possible dispersion mechanisms of rDNA sequences. We documented that rDNA probe signals were identified on one to six pairs of chromosomes, both acrocentric and metacentric ones. In addition, we examined the potential homology of chromosomes bearing rDNA genes across different species and in a wide phylogenetic perspective, based on the DAPI-inverted pattern and their synteny to human. Our analysis revealed an extensive variability in the topology of the rDNA signals across studied species. In some cases, closely related species show signals on homologous chromosomes, thus representing synapomorphies, while in other cases, signal was detected on distinct chromosomes, leading to species specific patterns. These results led us to support the hypothesis that different mechanisms are responsible for the distribution of the ribosomal DNA cluster in Primates.
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Affiliation(s)
- Sofia Mazzoleni
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, via Archirafi 18
- Faculty of Science, Department of Ecology, Viničná 7, Charles University, Pragha 2, Czech Republic
| | - Michail Rovatsos
- Faculty of Science, Department of Ecology, Viničná 7, Charles University, Pragha 2, Czech Republic
| | - Odessa Schillaci
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, via Archirafi 18
| | - Francesca Dumas
- Dipartimento di Scienze e Tecnologie Biologiche, Chimiche e Farmaceutiche (STEBICEF), Università degli Studi di Palermo, via Archirafi 18
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Impact of Xist RNA on chromatin modifications and transcriptional silencing maintenance at different stages of imprinted X chromosome inactivation in vole Microtus levis. Chromosoma 2017; 127:129-139. [PMID: 29151149 DOI: 10.1007/s00412-017-0650-9] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/08/2017] [Revised: 10/19/2017] [Accepted: 10/30/2017] [Indexed: 10/18/2022]
Abstract
In vole Microtus levis, cells of preimplantation embryo and extraembryonic tissues undergo imprinted X chromosome inactivation (iXCI) which is triggered by a long non-coding nuclear RNA, Xist. At early stages of iXCI, chromatin of vole inactive X chromosome is enriched with the HP1 heterochromatin-specific protein, trimethylated H3K9 and H4K20 attributable to constitutive heterochromatin. In the study, using vole trophoblast stem (TS) cells as a model of iXCI, we further investigated chromatin of the inactive X chromosome of M. levis and tried to find out the role of Xist RNA. We demonstrated that chromatin of the inactive X chromosome in vole TS cells also contained the SETDB1 histone methyltransferase and KAP1 protein. In addition, we observed that Xist RNA did not contribute significantly to maintenance of X chromosome inactive state during iXCI in vole TS cells. Xist repression affected neither transcriptional silencing caused by iXCI nor maintenance of trimethylated H3K9 and H4K20 as well as HP1, KAP1, and SETDB1 on the inactive X chromosome. Moreover, the unique repertoire of chromatin modifications on the inactive X chromosome in vole TS cells could be disrupted by a chemical compound, DZNep, and then restored even in the absence of Xist RNA. However, Xist transcript was necessary for recruitment of an additional repressive histone modification, trimethylated H3K27, to the inactive X chromosome during vole TS cell differentiation.
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Bolzán AD. Interstitial telomeric sequences in vertebrate chromosomes: Origin, function, instability and evolution. MUTATION RESEARCH-REVIEWS IN MUTATION RESEARCH 2017; 773:51-65. [PMID: 28927537 DOI: 10.1016/j.mrrev.2017.04.002] [Citation(s) in RCA: 45] [Impact Index Per Article: 6.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 03/13/2017] [Accepted: 04/17/2017] [Indexed: 12/21/2022]
Abstract
By definition, telomeric sequences are located at the very ends or terminal regions of chromosomes. However, several vertebrate species show blocks of (TTAGGG)n repeats present in non-terminal regions of chromosomes, the so-called interstitial telomeric sequences (ITSs), interstitial telomeric repeats or interstitial telomeric bands, which include those intrachromosomal telomeric-like repeats located near (pericentromeric ITSs) or within the centromere (centromeric ITSs) and those telomeric repeats located between the centromere and the telomere (i.e., truly interstitial telomeric sequences) of eukaryotic chromosomes. According with their sequence organization, localization and flanking sequences, ITSs can be classified into four types: 1) short ITSs, 2) subtelomeric ITSs, 3) fusion ITSs, and 4) heterochromatic ITSs. The first three types have been described mainly in the human genome, whereas heterochromatic ITSs have been found in several vertebrate species but not in humans. Several lines of evidence suggest that ITSs play a significant role in genome instability and evolution. This review aims to summarize our current knowledge about the origin, function, instability and evolution of these telomeric-like repeats in vertebrate chromosomes.
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Affiliation(s)
- Alejandro D Bolzán
- Laboratorio de Citogenética y Mutagénesis, Instituto Multidisciplinario de Biología Celular (IMBICE, CICPBA-UNLP-CONICET La Plata), C.C. 403, 1900 La Plata, Argentina; Facultad de Ciencias Naturales y Museo, UNLP, Calle 60 y 122, 1900 La Plata, Argentina.
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Ranchelli E, Barfknecht R, Capizzi D, Riga F, Mazza V, Dell'Agnello F, Zaccaroni M. From biology to management of Savi's pine vole (Microtus savii). PEST MANAGEMENT SCIENCE 2016; 72:857-863. [PMID: 26694699 DOI: 10.1002/ps.4212] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/18/2015] [Revised: 12/17/2015] [Accepted: 12/18/2015] [Indexed: 06/05/2023]
Abstract
Savi's pine vole (Microtus savii) is a rodent species of the Cricetidae family, inhabiting southern European agroecosystems. It is considered to be the main cause of rodent-attributed damage in Italy. To achieve an effective management, detailed knowledge of this species is needed. However, the available information about this species is fragmentary and incomplete. In this paper, the existing knowledge of Savi's pine vole taxonomy, reproduction, population dynamics, habitat and food preferences is reviewed in order to organise available information and identify priority areas of future research. Some of the changes in farming practices that have occurred in recent decades may have increased the impact of Savi's pine vole populations in crop fields. To manage this pest species effectively, an integrated strategy is recommended (involving habitat management, trapping and, when appropriate, the use of rodenticides). The apparent lack of cyclical population outbreaks and the relatively small litter size and long gestation and interpartum period of this species suggest that it could be more manageable than other vole species, while its strict herbivorous diet, stable population size in open habitats and wide distribution seem to indicate it as an ideal model species for risk assessment studies.
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Affiliation(s)
- Elisa Ranchelli
- Department of Biology, University of Florence, Florence, Italy
| | | | - Dario Capizzi
- Latium Region - Regional Parks Agency, Biodiversity and Geodiversity Area, Rome, Italy
| | - Francesco Riga
- ISPRA - Institute for Environmental Protection and Research, Rome, Italy
| | - Valeria Mazza
- Department of Biology, University of Florence, Florence, Italy
| | | | - Marco Zaccaroni
- Department of Biology, University of Florence, Florence, Italy
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Bezerra AMR, Annesi F, Aloise G, Amori G, Giustini L, Castiglia R. Integrative taxonomy of the Italian pine voles,Microtus saviigroup (Cricetidae, Arvicolinae). ZOOL SCR 2015. [DOI: 10.1111/zsc.12155] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Alexandra M. R. Bezerra
- Laboratório de Biologia e Parasitologia de Mamíferos Silvestres Reservatórios; Instituto Oswaldo Cruz; Fiocruz, Av. Brasil, 4365 CEP 21045-900 Rio de Janeiro RJ Brazil
| | - Flavia Annesi
- Dipartimento di Biologia e Biotecnologie ‘Charles Darwin’; Università di Roma ‘La Sapienza’; CAP 00151 Rome Italy
| | - Gaetano Aloise
- Museo di Storia Naturale della Calabria e Orto Botanico; Università della Calabria; CAP 87036 Rende Cosenza Italy
| | - Giovanni Amori
- CNR; Institute of Ecosystem Studies; Viale dell'Università 32 00185 Rome Italy
| | - Leonardo Giustini
- Dipartimento di Biologia e Biotecnologie ‘Charles Darwin’; Università di Roma ‘La Sapienza’; CAP 00151 Rome Italy
| | - Riccardo Castiglia
- Dipartimento di Biologia e Biotecnologie ‘Charles Darwin’; Università di Roma ‘La Sapienza’; CAP 00151 Rome Italy
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Rossi L, Luaces J, Alonso F, Merani M. Karyotype and Chromosome Variability in the Armadillo Chaetophractus villosus in Argentina. Cytogenet Genome Res 2014; 142:101-6. [DOI: 10.1159/000357219] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 10/17/2013] [Indexed: 11/19/2022] Open
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