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Glugoski L, Deon GA, Nogaroto V, Moreira-Filho O, Vicari MR. Robertsonian Fusion Site in Rineloricaria pentamaculata (Siluriformes: Loricariidae): Involvement of 5S Ribosomal DNA and Satellite Sequences. Cytogenet Genome Res 2023; 162:657-664. [PMID: 37054691 DOI: 10.1159/000530636] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/20/2022] [Accepted: 04/07/2023] [Indexed: 04/15/2023] Open
Abstract
Cytogenetic studies demonstrated that unstable chromosomal sites in armored catfishes (Loricariidae) triggered intense karyotypic diversification, mainly derived from Robertsonian rearrangements. In Loricariinae, the presence of ribosomal DNA (rDNA) clusters and their flanking repeated regions (such as microsatellites or partial transposable element sequences) was proposed to facilitate chromosomal rearrangements. Hence, this study aimed to characterize the numerical chromosomal polymorphism observed in Rineloricaria pentamaculata and evaluate the chromosomal rearrangements which originated diploid chromosome number (2n) variation, from 56 to 54. Our data indicate a centric fusion event between acrocentric chromosomes of pairs 15 and 18, bearing 5S rDNA sites on their short (p) arms. This chromosome fusion established the numerical polymorphism, decreasing the 2n from original 56 (karyomorph A) to 55 in karyomorph B and 54 in karyomorph C. Although vestiges of telomeric sequences were evidenced at the fusion point, no 5S rDNA was detected in this region. The acrocentric chromosomes involved in the origin of the fusion were enriched with (CA)n and (GA)n microsatellites. Repetitive sequences in the acrocentric chromosomes subtelomeres have facilitated the rearrangement. Our study thus reinforces the view on the important role of particular repetitive DNA classes in promoting chromosome fusions which frequently drive Rineloricaria karyotype evolution.
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Affiliation(s)
- Larissa Glugoski
- Department of Genetics and Evolution, Federal University of São Carlos, São Carlos, Brazil
| | - Geize A Deon
- Department of Genetics and Evolution, Federal University of São Carlos, São Carlos, Brazil
| | - Viviane Nogaroto
- Department of Structural Biology, Molecular and Genetics, State University of Ponta Grossa, Ponta Grossa, Brazil
| | - Orlando Moreira-Filho
- Department of Genetics and Evolution, Federal University of São Carlos, São Carlos, Brazil
| | - Marcelo Ricardo Vicari
- Department of Structural Biology, Molecular and Genetics, State University of Ponta Grossa, Ponta Grossa, Brazil
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Sassi FDMC, Deon GA, Moreira-Filho O, Vicari MR, Bertollo LAC, Liehr T, de Oliveira EA, Cioffi MB. Multiple Sex Chromosomes and Evolutionary Relationships in Amazonian Catfishes: The Outstanding Model of the Genus Harttia (Siluriformes: Loricariidae). Genes (Basel) 2020; 11:genes11101179. [PMID: 33050411 PMCID: PMC7600804 DOI: 10.3390/genes11101179] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/14/2020] [Revised: 10/06/2020] [Accepted: 10/08/2020] [Indexed: 02/06/2023] Open
Abstract
The armored Harttia catfishes present great species diversity and remarkable cytogenetic variation, including different sex chromosome systems. Here we analyzed three new species, H. duriventris, H. villasboas and H. rondoni, using both conventional and molecular cytogenetic techniques (Giemsa-staining and C-banding), including the mapping of repetitive DNAs using fluorescence in situ hybridization (FISH) and comparative genomic hybridization (CGH) experiments. Both H. duriventris and H. villasboas have 2n = ♀56/♂55 chromosomes, and an X1X1X2X2 /X1X2Y sex chromosome system, while a proto or neo-XY system is proposed for H. rondoni (2n = 54♀♂). Single motifs of 5S and 18S rDNA occur in all three species, with the latter being also mapped in the sex chromosomes. The results confirm the general evolutionary trend that has been noticed for the genus: an extensive variation on their chromosome number, single sites of rDNA sequences and the occurrence of multiple sex chromosomes. Comparative genomic analyses with another congeneric species, H. punctata, reveal that the X1X2Y sex chromosomes of these species share the genomic contents, indicating a probable common origin. The remarkable karyotypic variation, including sex chromosomes systems, makes Harttia a suitable model for evolutionary studies focusing on karyotype differentiation and sex chromosome evolution among lower vertebrates.
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Affiliation(s)
- Francisco de M. C. Sassi
- Laboratório de Citogenética de Peixes, Departamento de Genética e Evolução, Universidade Federal de São, Carlos, São Carlos, SP 13565-905, Brazil; (F.d.M.C.S.); (G.A.D.); (O.M.-F.); (L.A.C.B.); (M.B.C.)
| | - Geize A. Deon
- Laboratório de Citogenética de Peixes, Departamento de Genética e Evolução, Universidade Federal de São, Carlos, São Carlos, SP 13565-905, Brazil; (F.d.M.C.S.); (G.A.D.); (O.M.-F.); (L.A.C.B.); (M.B.C.)
- Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR 84010-330, Brazil;
| | - Orlando Moreira-Filho
- Laboratório de Citogenética de Peixes, Departamento de Genética e Evolução, Universidade Federal de São, Carlos, São Carlos, SP 13565-905, Brazil; (F.d.M.C.S.); (G.A.D.); (O.M.-F.); (L.A.C.B.); (M.B.C.)
- Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR 84010-330, Brazil;
| | - Marcelo R. Vicari
- Departamento de Biologia Estrutural, Molecular e Genética, Universidade Estadual de Ponta Grossa, Ponta Grossa, PR 84010-330, Brazil;
| | - Luiz A. C. Bertollo
- Laboratório de Citogenética de Peixes, Departamento de Genética e Evolução, Universidade Federal de São, Carlos, São Carlos, SP 13565-905, Brazil; (F.d.M.C.S.); (G.A.D.); (O.M.-F.); (L.A.C.B.); (M.B.C.)
| | - Thomas Liehr
- Institute of Human Genetics, University Hospital Jena, Jena 07747, Germany
- Correspondence: ; Tel.: +49-3641-9396850; Fax: +49-3641-9396852
| | | | - Marcelo B. Cioffi
- Laboratório de Citogenética de Peixes, Departamento de Genética e Evolução, Universidade Federal de São, Carlos, São Carlos, SP 13565-905, Brazil; (F.d.M.C.S.); (G.A.D.); (O.M.-F.); (L.A.C.B.); (M.B.C.)
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