University of Oulu

Sigeman, H., Zhang, H., Ali Abed, S., & Hansson, B. (2022). A novel neo‐sex chromosome in Sylvietta brachyura (Macrosphenidae) adds to the extraordinary avian sex chromosome diversity among Sylvioidea songbirds. Journal of Evolutionary Biology, 35(12), 1797–1805.

A novel neo-sex chromosome in Sylvietta brachyura (Macrosphenidae) adds to the extraordinary avian sex chromosome diversity among Sylvioidea songbirds

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Author: Sigeman, Hanna1,2; Zhang, Hongkai1; Abed, Salwan Ali3;
Organizations: 1Department of Biology, Lund University, Lund, Sweden
2Ecology and Genetics Research Unit, University of Oulu, Oulu, Finland
3College of Science, University of Al-Qadisiyah, Iraq
Format: article
Version: published version
Access: open
Online Access: PDF Full Text (PDF, 3.9 MB)
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Language: English
Published: John Wiley & Sons, 2022
Publish Date: 2023-01-24


We report the discovery of a novel neo-sex chromosome in an African warbler, Sylvietta brachyura (northern crombec; Macrosphenidae). This species is part of the Sylvioidea superfamily, where four separate autosome–sex chromosome translocation events have previously been discovered via comparative genomics of 11 of the 22 families in this clade. Our discovery here resulted from analyses of genomic data of single species-representatives from three additional Sylvioidea families (Macrosphenidae, Pycnonotidae and Leiothrichidae). In all three species, we confirmed the translocation of a part of chromosome 4A to the sex chromosomes, which originated basally in Sylvioidea. In S. brachyura, we found that a part of chromosome 8 has been translocated to the sex chromosomes, forming a unique neo-sex chromosome in this lineage. Furthermore, the non-recombining part of 4A in S. brachyura is smaller than in other Sylvioidea species, which suggests that recombination continued along this region after the fusion event in the Sylvioidea ancestor. These findings reveal additional sex chromosome diversity among the Sylvioidea, where five separate translocation events are now confirmed.

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Series: Journal of evolutionary biology
ISSN: 1010-061X
ISSN-E: 1420-9101
ISSN-L: 1010-061X
Volume: 35
Issue: 12
Pages: 1797 - 1805
DOI: 10.1111/jeb.14096
Type of Publication: A1 Journal article – refereed
Field of Science: 1181 Ecology, evolutionary biology
Funding: Sequencing was performed by the SNP&SEQ Technology Platform at Uppsala Genome Center, which is part of National Genomics Infrastructure (NGI) Sweden, and Science for Life Laboratory (SciLifeLab), supported by the Swedish Research Council (and its Council for Research infrastructure, RFI) and the Knut and Alice Wallenberg Foundation. Bioinformatics analyses were performed on computational infrastructure provided by the Swedish National Infrastructure for Computing (SNIC) at Uppsala Multidisciplinary Center for Advanced Computational Science (UPPMAX). The research was funded by a grant from the Swedish Research Council (consolidator grant no. 621-2016-689 to B.H.).
Dataset Reference: The sequencing data used in this study are available in the NCBI Sequence Read Archive under BioProject PRJNA578893. Configuration files for the findZX analyses, along with output tables and plots, are available on Dryad (
Copyright information: © 2022 The Authors. This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.