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.

Autor:	Damasceno MTDS; Universidade Federal do Amapá, Campus Binacional - Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, Brazil Universidade Federal do Amapá Oiapoque Brazil.; Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, Brazil Universidade Federal do Amapá Macapá Brazil., Teixeira GA; Universidade Federal do Amapá, Campus Binacional - Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, Brazil Universidade Federal do Amapá Oiapoque Brazil., Ferreira PC; Universidade Federal do Amapá, Campus Binacional - Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, Brazil Universidade Federal do Amapá Oiapoque Brazil.; Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, Brazil Universidade Federal do Amapá Macapá Brazil., Lod RB; Universidade Federal do Amapá, Campus Binacional - Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, Brazil Universidade Federal do Amapá Oiapoque Brazil.; Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, Brazil Universidade Federal do Amapá Macapá Brazil., Barros LAC; Universidade Federal do Amapá, Campus Binacional - Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, Brazil Universidade Federal do Amapá Oiapoque Brazil., de Aguiar HJAC; Universidade Federal do Amapá, Campus Binacional - Oiapoque, n°3051, Bairro Universidade, Oiapoque, Amapá, 68980-000, Brazil Universidade Federal do Amapá Oiapoque Brazil.; Programa de Pós-graduação em Biodiversidade Tropical, Universidade Federal do Amapá, Campus Marco Zero do Equador, Macapá, Amapá, 68.903-419, Brazil Universidade Federal do Amapá Macapá Brazil.
Jazyk:	angličtina
Zdroj:	Comparative cytogenetics [Comp Cytogenet] 2024 Jun 26; Vol. 18, pp. 105-122. Date of Electronic Publication: 2024 Jun 26 (Print Publication: 2024).
DOI:	10.3897/compcytogen.18.125235
Abstrakt:	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. (Monique Telcia dos Santos Damasceno, Gisele Amaro Teixeira, Paulo Castro Ferreira, Rodrigo Batista Lod, Luísa Antônia Campos Barros, Hilton Jeferson Alves Cardoso de Aguiar.)
Databáze:	MEDLINE
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