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Different steps in the evolution of neo-sex chromosomes in two East African Spalacomimus species (Orthoptera: Tettigoniidae: Hetrodinae)

Title data

Warchałowska-Śliwa, Elżbieta ; Grzywacz, Beata ; Maryanska-Nadachowska, Anna ; Hemp, Andreas ; Hemp, Claudia:
Different steps in the evolution of neo-sex chromosomes in two East African Spalacomimus species (Orthoptera: Tettigoniidae: Hetrodinae).
In: European Journal of Entomology. Vol. 112 (2015) Issue 1 . - pp. 1-10.
ISSN 1802-8829
DOI: https://doi.org/10.14411/eje.2015.024

Abstract in another language

Two orthopteran species belonging to the East African genus Spalacomimus, S. verruciferus and S. talpa (Tettigoniidae: Hetrodinae), were investigated using both molecular cytogenetic techniques, including fluorescence in situ hybridization with 18S rDNA and (TTAGG)n telomeric probes, and classical techniques, such as C-banding, fluorochrome CMA3/DAPI staining, and silver impregnation. These techniques allowed us to identify cytogenetic markers that were then used to elucidate chromosome organization and differences between species. Chromosomal complements are reported for the first time for both analyzed species, which showed thesame chromosomal number of 2n = 24 and the neo-XY sex chromosome system; however, the morphology of neo-sex chromosomes differs between these species. A cluster of the major rDNA (i.e., the nucleolar organizer region, NOR) was found to be located in the interstitial region of the sex chromosomes of S. verruciferus, whereas it was on the long pair of autosomes in S. talpa. The differencebetween the karyotypes of the studied species indicate divergent origins of their neo-XY systems. A detailed description of the structure and behaviour of the sex chromosome configuration in male meiosis is provided. In S. verruciferus, the neo-XY system is derived from a Robertsonian fusion between the original acrocentric X and an acrocentric long pair of autosomes bearing an rDNA/NOR locus, leading to a bi-armed X and an acrocentric neo-Y chromosome. The neo-XY in S. talpa arose due to complicated rearrangements, attributable to a tandem fusion between the original acrocentric X and part of a medium-sized autosome, and resulting in supernumerary chromosomes. In the latter case, behaviour of the neo-X and neo-Y demonstrates a post-reductional division of these chromosomes. Variation in the evolution of two neo-XY sex chromosome systems are novel phylogenetic markers for the Hetrodinae and seem to promote speciation as important aspect for taxonomy.

Further data

Item Type: Article in a journal
Refereed: Yes
Institutions of the University: Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Animal Ecology II - Evolutionary Animal Ecology
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 22 Jan 2020 14:15
Last Modified: 22 Jan 2020 14:15
URI: https://eref.uni-bayreuth.de/id/eprint/54041