ArticleGenome biology and evolution2019
Evolutionary Dynamics of Sex Chromosomes of Paleognathous Birds.
Article in Genome biology and evolution, 2019. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Cited by 32 papers.
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32 citing papers in PubMed, 64 citations in OpenAlex.
- Evolutionary dynamics of enlarged neo-sex chromosomes and novel pseudoautosomal regions in Sylvioidea songbirds.Communications biology · 2026Article
- Unique sex chromosome translocations and evolutionary strata in two Sylvioidea songbird families.BMC genomics · 2026Article
- Dismantling Chromosomal Stasis Across the Eukaryotic Tree of Life.bioRxiv : the preprint server for biology · 2026Article
- Neo-sex Chromosomes Track the Mitochondrial Phylogeny and Exhibit an Extensive Added Stratum of Recombination Suppression in Honeyeaters (Aves: Meliphagidae).Genome biology and evolution · 2025Article
- Birth of protein-coding exons by ancient domestication of LINE-1 retrotransposon.Genome research · 2025Article
- Insights into avian molecular cytogenetics-with reptilian comparisons.Molecular cytogenetics · 2024Review
- Incomplete transcriptional dosage compensation of chicken and platypus sex chromosomes is balanced by post-transcriptional compensation.Proceedings of the National Academy of Sciences of the United States of America · 2024Article
- Fast and Simple Molecular Test for Sex Determination of the MonomorphicAnimals : an open access journal from MDPI · 2024Article
- Role-reversed polyandry is associated with faster fast-Z in shorebirds.Proceedings. Biological sciences · 2024Article
- Evolution of bird sex chromosomes: a cytogenomic approach in Palaeognathae species.BMC ecology and evolution · 2024Article
- Evolution and expression patterns of the neo-sex chromosomes of the crested ibis.Nature communications · 2024Article
- Chromatin accessibility, not 5mC methylation covaries with partial dosage compensation in crows.PLoS genetics · 2023Article
- Elasmobranch genome sequencing reveals evolutionary trends of vertebrate karyotype organization.Genome research · 2023Article
- A high-quality genome assembly highlights the evolutionary history of the great bustard (Otis tarda, Otidiformes).Communications biology · 2023Article
- The evolutionary maintenance of ancient recombining sex chromosomes in the ostrich.PLoS genetics · 2023Article
- Ancient homomorphy of molluscan sex chromosomes sustained by reversible sex-biased genes and sex determiner translocation.Nature ecology & evolution · 2022Article
- Extreme variation in recombination rate and genetic diversity along the Sylvioidea neo-sex chromosome.Molecular ecology · 2022Article
- Recurrent chromosome reshuffling and the evolution of neo-sex chromosomes in parrots.Nature communications · 2022Article
- Support for faster and more adaptive Z chromosome evolution in two divergent lepidopteran lineagesEvolution; international journal of organic evolution · 2022Article
- Analysis of Sex Chromosome Evolution in the Clade Palaeognathae from Phased Genome Assembly.Genome biology and evolution · 2021Article
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Authors and funding
5 authors at 2 institutions in 3 countries.
Funding
No grant is acknowledged in the PubMed record.
Abstract
Standard models of sex chromosome evolution propose that recombination suppression leads to the degeneration of the heterogametic chromosome, as is seen for the Y chromosome in mammals and the W chromosome in most birds. Unlike other birds, paleognaths (ratites and tinamous) possess large nondegenerate regions on their sex chromosomes (PARs or pseudoautosomal regions). It remains unclear why these large PARs are retained over >100 Myr, and how this retention impacts the evolution of sex chromosomes within this system. To address this puzzle, we analyzed Z chromosome evolution and gene expression across 12 paleognaths, several of whose genomes have recently been sequenced. We confirm at the genomic level that most paleognaths retain large PARs. As in other birds, we find that all paleognaths have incomplete dosage compensation on the regions of the Z chromosome homologous to degenerated portions of the W (differentiated regions), but we find no evidence for enrichments of male-biased genes in PARs. We find limited evidence for increased evolutionary rates (faster-Z) either across the chromosome or in differentiated regions for most paleognaths with large PARs, but do recover signals of faster-Z evolution in tinamou species with mostly degenerated W chromosomes, similar to the pattern seen in neognaths. Unexpectedly, in some species, PAR-linked genes evolve faster on average than genes on autosomes, suggested by diverse genomic features to be due to reduced efficacy of selection in paleognath PARs. Our analysis shows that paleognath Z chromosomes are atypical at the genomic level, but the evolutionary forces maintaining largely homomorphic sex chromosomes in these species remain elusive.
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