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Germline-restricted chromosome shows remarkable variation in size among closely related passerine species
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SYSNO ASEP 0556703 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Germline-restricted chromosome shows remarkable variation in size among closely related passerine species Author(s) Sotelo-Muñoz, M. (CZ)
Poignet, M. (CZ)
Albrecht, Tomáš (UBO-W) RID, SAI, ORCID
Kauzál, Ondřej (UBO-W) ORCID, SAI
Didukh, Dmitrij (UZFG-Y) ORCID
Schlebusch, S. A. (CZ)
Janko, Karel (UZFG-Y) RID, ORCID
Reifová, R. (CZ)Number of authors 8 Source Title Chromosoma. - : Springer - ISSN 0009-5915
Roč. 131, 1-2 (2022), s. 77-86Number of pages 10 s. Language eng - English Country DE - Germany Keywords Germline-restricted chromosome ; Mosaicism ; Programmed DNA elimination ; Songbirds ; Speciation ; Spermatogenesis Subject RIV EG - Zoology OECD category Zoology R&D Projects GA20-23794S GA ČR - Czech Science Foundation (CSF) Method of publishing Limited access Institutional support UBO-W - RVO:68081766 ; UZFG-Y - RVO:67985904 UT WOS 000779612200001 EID SCOPUS 85127644711 DOI 10.1007/s00412-022-00771-6 Annotation Passerine birds have a supernumerary chromosome in their germ cells called the germline-restricted chromosome (GRC). The GRC was first discovered more than two decades ago in zebra finch but recent studies have suggested that it is likely present in all passerines, the most species rich avian order, encompassing more than half of all modern bird species. Despite its wide taxonomic distribution, studies on this chromosome are still scarce and limited to a few species. Here, we cytogenetically analyzed the GRC in five closely related estrildid finch species of the genus Lonchura. We show that the GRC varies enormously in size, ranging from a tiny micro-chromosome to one of the largest macro-chromosomes in the cell, not only among recently diverged species but also within species and sometimes even between germ cells of a single individual. In Lonchura atricapilla, we also observed variation in GRC copy number among male germ cells of a single individual. Finally, our analysis of hybrids between two Lonchura species with noticeably different GRC size directly supported maternal inheritance of the GRC. Our results reveal the extraordinarily dynamic nature of the GRC, which might be caused by frequent gains and losses of sequences on this chromosome leading to substantial differences in genetic composition of the GRC between and even within species. Such differences might theoretically contribute to reproductive isolation between species and thus accelerate the speciation rate of passerine birds compared to other bird lineages. Workplace Institute of Vertebrate Biology Contact Hana Slabáková, slabakova@ivb.cz, Tel.: 543 422 524 Year of Publishing 2023 Electronic address https://link.springer.com/article/10.1007/s00412-022-00771-6
Number of the records: 1