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. 2023 Sep 27;13:16167. doi: 10.1038/s41598-023-43164-0

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© The Author(s) 2023

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Localization of rDNA clusters in mitotic chromosomes of Ceratitis capitata by FISH with the 18 rDNA probe (red signals). Chromosomes, obtained from the brains of wild-type larvae (a, b) and T(X;5) larvae (c, d), were counterstained with DAPI (light blue). X and Y symbols denote sex chromosomes, symbol 5 stands for chromosome 5. Bar = 10 µm. (a) Female mitotic metaphase with two X chromosomes, each with a terminal rDNA cluster, and five pairs of autosomes. (b) Male mitotic metaphase with X and Y chromosomes, each with a terminal rDNA cluster, and five pairs of autosomes. (c) Female mitotic metaphase showing reciprocal translocations between two X chromosomes (asterisks), each with a terminal cluster of rDNA, and two chromosomes 5 (arrows). (d) Male mitotic prometaphase showing a T(X;5) translocation on the X chromosome (asterisk) and a T(5;X) translocation on one chromosome 5 (arrowhead); both the X and Y chromosomes show terminal clusters of rDNA (note that the rDNA clusters on the Y chromosome appear duplicated).