First Karyotype Description for Acanthognathus rudis Brown & Kempf, 1969 (Formicidae: Myrmicinae) with Notes on Its Natural History DOI Creative Commons
Gabriela de Figueiredo Jacintho, Eduarda Melo de Abreu Vieira, Gisele Amaro Teixeira

et al.

Sociobiology, Journal Year: 2024, Volume and Issue: 71(3), P. e10778 - e10778

Published: Sept. 19, 2024

The trap-jaw ant Acanthognathus Mayr (Myrmicinae: Dacetina) has been subject of various studies since 1969, but there no progress in its cytogenetics. This study describes provides the first karyotype description a representative genus, A. rudis, including chromosomal number, morphology, and distribution repetitive sequences. A colony collected Southeastern Brazil exhibited diploid number 2n = 14 (12 metacentrics + 2 submetacentrics), lowest among Daceton genus-group Neotropical this group to be karyologically studied. rDNA clusters were located pericentromeric region single chromosome pair, (GA)n blocks present only terminal regions both arms euchromatic regions, (TTAGG)n hybridized with telomeres all chromosomes, without interstitial telomeric sites. sequence patterns align those observed other Formicidae. Additionally, we documented new behavioral aspects mandible use rudis workers provided images immature stages. These findings emphasize need for further research on genus-group.

Language: Английский

Structure and Evolution of Ribosomal Genes of Insect Chromosomes DOI Creative Commons
Vladimir E. Gokhman, Valentina G. Kuznetsova

Insects, Journal Year: 2024, Volume and Issue: 15(8), P. 593 - 593

Published: Aug. 4, 2024

Currently, clusters of 45S and 5S ribosomal DNA (rDNA) have been studied in about 1000 100 species the class Insecta, respectively. Although number insect with known rDNA (also referred to as nucleolus-organizing regions, or NORs) constitutes less than 0.1 percent described members this enormous group, certain conclusions can already be drawn. Since haploid karyotypes single predominate both basal derived groups, character state is apparently ancestral for Insecta general. Nevertheless, number, chromosomal location, other characteristics sites substantially vary across different species, sometimes even within same species. There are several main factors molecular mechanisms that either maintain these parameters alter them on short-term and/or long-term scale. Chromosome structure (i.e., monocentric vs. holokinetic chromosomes), excessive numbers rRNA gene copies per cluster, interactions transposable elements, pseudogenization, meiotic recombination perhaps most important among them.

Language: Английский

Citations

3

First Karyotype Description for Acanthognathus rudis Brown & Kempf, 1969 (Formicidae: Myrmicinae) with Notes on Its Natural History DOI Creative Commons
Gabriela de Figueiredo Jacintho, Eduarda Melo de Abreu Vieira, Gisele Amaro Teixeira

et al.

Sociobiology, Journal Year: 2024, Volume and Issue: 71(3), P. e10778 - e10778

Published: Sept. 19, 2024

The trap-jaw ant Acanthognathus Mayr (Myrmicinae: Dacetina) has been subject of various studies since 1969, but there no progress in its cytogenetics. This study describes provides the first karyotype description a representative genus, A. rudis, including chromosomal number, morphology, and distribution repetitive sequences. A colony collected Southeastern Brazil exhibited diploid number 2n = 14 (12 metacentrics + 2 submetacentrics), lowest among Daceton genus-group Neotropical this group to be karyologically studied. rDNA clusters were located pericentromeric region single chromosome pair, (GA)n blocks present only terminal regions both arms euchromatic regions, (TTAGG)n hybridized with telomeres all chromosomes, without interstitial telomeric sites. sequence patterns align those observed other Formicidae. Additionally, we documented new behavioral aspects mandible use rudis workers provided images immature stages. These findings emphasize need for further research on genus-group.

Language: Английский

Citations

0