Cytogenetic variability in four species of Gnamptogenys Roger, 1863 (Formicidae: Ectatomminae) showing chromosomal polymorphisms, species complex, and cryptic species

Teixeira, Gisele Amaro; Barros, Luísa Antônia Campos; Lopes, Denilce Meneses; Aguiar, Hilton Jeferson Alves Cardoso de

doi:10.1007/s00709-019-01451-6

Cited by 11 publications

(14 citation statements)

References 31 publications

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“…Size variations in the rDNA clusters can be observed when these genes are located in the interstitial/pericentromeric region of the chromosomes, as seen in Gnamptogenys regularis Mayr, 1870 (Teixeira et al, 2020) and in O. bauri (this study). A different path seems to be involved in the evolution of these karyotypes compared to the rearrangements involved in terminal rDNA heteromorphisms.…”

Section: Insights Concerning the Organizational Patterns Of Ribosomal Gene Clusters In The Ant Genomesupporting

confidence: 57%

“…Despite the chromosomal variation observed in Gnamptogenys spp. (2 n = 24–44), they all have a single rDNA site in the intrachromosomal region (Teixeira et al ., 2020). Even Gnamptogenys moelleri (Forel, 1912), a species with differing chromosome numbers between two populations (2 n = 34 and 44), has a single intrachromosomal rDNA site.…”

Section: Discussionmentioning

confidence: 99%

“…In ants, the physical mapping of rDNA genes using the FISH technique was first described in Australian ants by Hirai et al (1994Hirai et al ( , 1996. Since then, the number of studies mapping these genes has increased (Mariano et al, 2008;Santos et al, 2016;Micolino et al, 2019a;Teixeira et al, 2020) and other repetitive sequences, such as telomeres (Meyne et al, 1995;Pereira et al, 2018;Micolino et al, 2020;Castro et al, 2020), satellite DNA (Lorite et al, 2004;Huang et al, 2016), 5S ribosomal genes (Aguiar et al, 2017), and microsatellites (Barros et al, 2018;Micolino et al, 2019b), have been mapped in the chromosomes using the FISH technique. To date, molecular cytogenetic studies on rDNA genes in ants have improved understanding of chromosomal evolution and phylogeny and provided taxonomic resolutions for different ant groups (Hirai et al, 1994(Hirai et al, , 1996Santos et al, 2010Santos et al, , 2016.…”

Section: Introductionmentioning

confidence: 99%

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Evolutionary insights into the genomic organization of major ribosomal DNA in ant chromosomes

Teixeira

Aguiar

Petitclerc

et al. 2021

Insect Molecular Biology

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The major rDNA genes are composed of tandem repeats and are part of the nucleolus organizing regions (NORs). They are highly conserved and therefore useful in understanding the evolutionary patterns of chromosomal locations. The evolutionary dynamics of the karyotype may affect the organization of rDNA genes within chromosomes. In this study, we physically mapped 18S rDNA genes in 13 Neotropical ant species from four subfamilies using fluorescence in situ hybridization. Furthermore, a survey of published rDNA cytogenetic data for 50 additional species was performed, which allowed us to detect the evolutionary patterns of these genes in ant chromosomes. Species from the Neotropical, Palearctic, and Australian regions, comprising a total of 63 species from 19 genera within six subfamilies, were analysed. Most of the species (48 out of 63) had rDNA genes restricted to a single chromosome pair in their intrachromosomal regions. The position of rDNA genes within the chromosomes appears to hinder their dispersal throughout the genome, as translocations and ectopic recombination are uncommon in intrachromosomal regions because they can generate meiotic abnormalities. Therefore, rDNA genes restricted to a single chromosome pair seem to be a plesiomorphic feature in ants, while multiple rDNA sites, observed in distinct subfamilies, may have independent origins in different genera.

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Section: Insights Concerning the Organizational Patterns Of Ribosomal Gene Clusters In The Ant Genomesupporting

confidence: 57%

Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Evolutionary insights into the genomic organization of major ribosomal DNA in ant chromosomes

Teixeira

Aguiar

Petitclerc

et al. 2021

Insect Molecular Biology

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“…Other interesting examples have been observed in Neoponera apicalis (Latreille 1802) and N. verenae Forel, 1922, with extensive variations in chromosome number among populations of the same species (Mariano et al, 2012). Karyotypic populational studies in ants although scarce have brought novelties and important insights in ant evolution (Velasco et al, 2014;Aguiar et al 2017;Micolino et al, 2019a, b;Teixeira et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

Cytogenetics of Strumigenys louisianae Roger, 1863 (Formicidae: Myrmicinae) from North-eastern Amazonia shed light on a difficult species complex

Barros

Chaul

Orivel

et al. 2021

Zoologischer Anzeiger

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Highlights-S. louisianae from the Amazon rainforest showed an intriguing karyotype: 2n=26.-The karyotype of the Amazonian S. louisianae contrasts with an already described one.-Morphological and karyotype variations put to question the limits of the taxon.-Morphology of the Amazonian S. louisianae is similar to the type locality in the USA.-After our findings, we encourage reevaluation of junior synonyms of S. louisianae.

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“…The minimum interaction theory (MIT), the most widely used in ants, proposes that centric fissions are the main rearrangements that explain this significant chromosomal variation among species (Imai et al, 1994). However, inversions, translocations, and Robertsonian fusions have also been important in the origin of numerical and structural chromosomal polymorphisms and chromosome evolution in ant species (reviewed by Lorite & Palomeque, 2010;Mariano et al, 2019;Teixeira et al, 2020;Micolino et al, 2020).…”

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confidence: 99%

Karyotypic data of five ant taxa from the Brazilian Atlantic rainforest

Teixeira

Barros²,

Lopes

et al. 2020

Sociobiology

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The Brazilian Atlantic rainforest is an endangered biome and biodiversity hotspot. Ant cytogenetic studies from this biome showed remarkable chromosomal diversity among species, and provided useful insights on phylogeny, chromosomal evolution, and taxonomy. In this study, we karyotyped five ant taxa from the Atlantic rainforest. The karyotypes observed were Pheidole germaini 2n=22, Pheidole sp. flavens group 2n=20, Brachymyrmex admotus 2n=18, Camponotus atriceps 2n=40, and Odontomachus haematodus 2n=44. The data obtained for Pheidole spp. represent the first chromosomal record for the genus in Brazil and provide insights on the chromosomal evolution of P. germaini. Karyotypic information from B. admotus brings the genus back to the cytogenetic scenario after decades of neglect. No karyotype variations were observed among the C. atriceps and O. haematodus from different already studied populations, corroborating their status as good species. This study increased the cytogenetic knowledge of ants from the Brazilian Atlantic rainforest.

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Cytogenetic variability in four species of Gnamptogenys Roger, 1863 (Formicidae: Ectatomminae) showing chromosomal polymorphisms, species complex, and cryptic species

Cited by 11 publications

References 31 publications

Evolutionary insights into the genomic organization of major ribosomal DNA in ant chromosomes

Evolutionary insights into the genomic organization of major ribosomal DNA in ant chromosomes

Cytogenetics of Strumigenys louisianae Roger, 1863 (Formicidae: Myrmicinae) from North-eastern Amazonia shed light on a difficult species complex

Karyotypic data of five ant taxa from the Brazilian Atlantic rainforest

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