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Teixeira GA, Travenzoli NM, Tavares MG. Chromosomal organization of different repetitive sequences in four wasp species of the genus Trypoxylon Latreille (Hymenoptera: Crabronidae) and insights into the composition of wasp telomeres. Genome 2024; 67:243-255. [PMID: 38593475 DOI: 10.1139/gen-2023-0132] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/11/2024]
Abstract
This study characterizes the chromosomal organization of DNA repetitive sequences and the karyotypic evolution in four representatives of the solitary wasp genus Trypoxylon using conventional and molecular cytogenetic techniques. Our findings present the first cytogenetic data for Trypoxylon rogenhoferi (2n = 30) and Trypoxylon albonigrum (2n = 32), while the karyotypes of Trypoxylon nitidum (2n = 30) and Trypoxylon lactitarse (2n = 30) were similar to those previously described. Fluorochrome staining and microsatellite distribution data revealed differences in the constitutive heterochromatin composition among species. Trypoxylon nitidum and T. albonigrum exhibited one major rDNA cluster, potentially representing an ancestral pattern for aculeate Hymenoptera, while T. rogenhoferi and T. lactitarse showed two pericentromeric rRNA gene sites, suggesting amplification events in their ancestral clade. The (TCAGG)n motif hybridized in the terminal regions of the chromosomes in all four Trypoxylon species, which may suggest that this sequence represents DNA telomeric repeat. Notably, the presence of this repetitive sequence in the centromeric regions of certain chromosome pairs in two species supports the hypothesis of chromosomal fusions or inversions in the ancestral karyotype of Trypoxylon. The study expands the chromosomal mapping data of repetitive sequences in wasps and offers insights into the dynamic evolutionary landscape of karyotypes in these insects.
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Affiliation(s)
| | - Natália Martins Travenzoli
- Departamento de Biologia Geral, Universidade Federal de Viçosa, Laboratório de Citogenética de Insetos, Viçosa, Minas Gerais 36570-900, Brazil
| | - Mara Garcia Tavares
- Departamento de Biologia Geral, Universidade Federal de Viçosa, Laboratório de Citogenética de Insetos, Viçosa, Minas Gerais 36570-900, Brazil
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Damasceno MTDS, Teixeira GA, Ferreira PC, Lod RB, Barros LAC, de Aguiar HJAC. Physical chromosomal mapping of major ribosomal genes in 15 ant species with a review of hypotheses regarding evolution of the number and position of NORs in ants. COMPARATIVE CYTOGENETICS 2024; 18:105-122. [PMID: 38966326 PMCID: PMC11222723 DOI: 10.3897/compcytogen.18.125235] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 04/12/2024] [Accepted: 05/27/2024] [Indexed: 07/06/2024]
Abstract
Recently, hypotheses regarding the evolutionary patterns of ribosomal genes in ant chromosomes have been under discussion. One of these hypotheses proposes a relationship between chromosomal location and the number of rDNA sites, suggesting that terminal locations facilitate the dispersion of rDNA clusters through ectopic recombination during meiosis, while intrachromosomal locations restrict them to a single chromosome pair. Another hypothesis suggests that the multiplication of rDNA sites could be associated with an increase in the chromosome number in Hymenoptera due to chromosomal fissions. In this study, we physically mapped rDNA sites in 15 new ant species and also reviewed data on rDNA available since the revision by Teixeira et al. (2021a). Our objectives were to investigate whether the new data confirm the relationship between chromosomal location and the number of rDNA sites, and whether the increase in the chromosome number is significant in the dispersion of rDNA clusters in ant karyotypes. Combining our new data with all information on ant cytogenetics published after 2021, 40 new species and nine new genera were assembled. Most species exhibited intrachromosomal rDNA sites on a single chromosome pair, while three species showed these genes in terminal regions of multiple chromosome pairs. On one hand, the hypothesis that the chromosomal location of rDNA clusters may facilitate the dispersion of rDNA sites in the ant genome, as previously discussed, was strengthened, but, on the other hand, the hypothesis of chromosomal fission as the main mechanism for dispersion of ribosomal genes in ants is likely to be refuted. Furthermore, in certain genera, the location of rDNA sites remained similar among the species studied, whereas in others, the distribution of these genes showed significant variation between species, suggesting a more dynamic chromosomal evolution.
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Affiliation(s)
- Monique Telcia dos Santos Damasceno
- Universidade Federal do Amapá, Campus Binacional – Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, BrazilUniversidade Federal do AmapáOiapoqueBrazil
- Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, BrazilUniversidade Federal do AmapáMacapáBrazil
| | - Gisele Amaro Teixeira
- Universidade Federal do Amapá, Campus Binacional – Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, BrazilUniversidade Federal do AmapáOiapoqueBrazil
| | - Paulo Castro Ferreira
- Universidade Federal do Amapá, Campus Binacional – Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, BrazilUniversidade Federal do AmapáOiapoqueBrazil
- Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, BrazilUniversidade Federal do AmapáMacapáBrazil
| | - Rodrigo Batista Lod
- Universidade Federal do Amapá, Campus Binacional – Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, BrazilUniversidade Federal do AmapáOiapoqueBrazil
- Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, BrazilUniversidade Federal do AmapáMacapáBrazil
| | - Luísa Antônia Campos Barros
- Universidade Federal do Amapá, Campus Binacional – Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, BrazilUniversidade Federal do AmapáOiapoqueBrazil
| | - Hilton Jeferson Alves Cardoso de Aguiar
- Universidade Federal do Amapá, Campus Binacional – Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, BrazilUniversidade Federal do AmapáOiapoqueBrazil
- Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, BrazilUniversidade Federal do AmapáMacapáBrazil
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Novaes CM, Teixeira GA, Juris EM, Lopes DM. Conventional cytogenetics and microsatellite chromosomal distribution in social wasp Mischocyttarus cassununga (Ihering, 1903) (Vespidae, Polistinae, Mischocyttarini). Genome 2024; 67:151-157. [PMID: 38262004 DOI: 10.1139/gen-2023-0026] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/25/2024]
Abstract
Cytogenetics has allowed the investigation of chromosomal diversity and repetitive genomic content in wasps. In this study, we characterized the karyotype of the social wasp Mischocyttarus cassununga using conventional cytogenetics and chromosomal mapping of repetitive sequences. This study was undertaken to extend our understanding of the genomic organization of repetitive DNA in social wasps and is the first molecular cytogenetic insight into the genus Mischocyttarus. The karyotype of M. cassununga had a chromosome number of 2n = 64 for females and n = 32 for males. Constitutive heterochromatin exhibited three distribution patterns: centromeric and pericentromeric regions along the smaller arms and extending almost the entire chromosome. The major ribosomal DNA sites were located on chromosome pair in females and one chromosome in males. Positive signals for the microsatellite probes (GA)n and (GAG)n were observed in the euchromatic regions of all chromosomes. The microsatellites, (CGG)n, (TAT)n, (TTAGG)n, and (TCAGG)n were not observed in any region of the chromosomes. Our results contrast with those previously obtained for Polybia fastidiosuscula, which showed that the microsatellites (GAG)n, (CGG)n, (TAT)n, (TTAGG)n, and (TCAGG)n are located predominantly in constitutive heterochromatin. This suggests variations in the diversity and chromosomal organization of repetitive sequences in the genomes of social wasps.
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Affiliation(s)
- Camila Moura Novaes
- Universidade Federal do Espírito Santo, Campus Alegre, Alto Universitário s/n, Guararema, Alegre, Espírito Santo, 29500-000, Brazil
| | - Gisele Amaro Teixeira
- Universidade Federal do Amapá, Campus Binacional - Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, Brazil
| | - Eydyeliana Month Juris
- Grupo de Investigación en Biotecnología, Universidad de Sucre, Facultad de Educación y Ciencias, Sincelejo, Colombia
| | - Denilce Meneses Lopes
- Laboratório de Citogenética de Insetos, Departamento de Biologia Geral, Universidade Federal de Viçosa, Campus Viçosa, Avenida Peter Henry Rolfs s/n, 36570-900, Viçosa, Minas Gerais, Brazil
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