Chromosome Comparisons of Australian Scaptodrosophila Species

Stocker, Ann Jacob, Schiffer, Michele, Gorab, Eduardo, and Hoffmann, Ary (2022) Chromosome Comparisons of Australian Scaptodrosophila Species. Insects, 13 (4). 364.

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Abstract

The Scaptodrosophila represent a diverse group of Diptera closely related to Drosophila. Although they have radiated extensively in Australia, they have been the focus of few studies. Here, we characterized the karyotypes of 12 Scaptodrosophila species from several species groups and showed that they have undergone similar types of karyotypic change to those seen in Drosophila. This includes heterochromatin amplification involved in length changes of the sex and ‘dot’ chromosomes as well as the autosomes, particularly in the coracina group of species. Numerous weak points along the arms of the polytene chromosomes suggest the presence of internal repetitive sequence DNA, but these regions did not C-band in mitotic chromosomes, and their analysis will depend on DNA sequencing. The nucleolar organizing regions (NORs) are at the same chromosome positions in Scaptodrosophila as in Drosophila, and the various mechanisms responsible for changing arm configurations also appear to be the same. These chromosomal studies provide a complementary resource to other investigations of this group, with several species currently being sequenced.

Item ID: 74547
Item Type: Article (Research - C1)
ISSN: 2075-4450
Keywords: comparison, evolution, heterochromatin, karyotypes, NORs, Scaptodrosophila
Copyright Information: © 2022 by the authors. Licensee MDPI, Basel, Switzerland. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution (CC BY) license (https://creativecommons.org/licenses/by/4.0/).
Date Deposited: 15 Nov 2022 03:58
FoR Codes: 31 BIOLOGICAL SCIENCES > 3104 Evolutionary biology > 310401 Animal systematics and taxonomy @ 100%
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