XY systems usually show chromosome-wide compensation of X-linked genes, while in many ZW systems, compensation is restricted to a minority of dosage-sensitive genes. Why such differences arose is still unclear. Here, we combine comparative genomics, transcriptomics and proteomics to obtain a complete overview of the evolution of gene dosage on the Z-chromosome of Schistosoma parasites. We compare the Z-chromosome gene content of African (Schistosoma mansoni and S. haematobium) and Asian (S. japonicum) schistosomes and describe lineage-specific evolutionary strata. We use these to assess gene expression evolution following sex-linkage. The resulting patterns suggest a reduction in expression of Z-linked genes in females, combined with upregulation of the Z in both sexes, in line with the first step of Ohno’s classic model of dosage compensation evolution. Quantitative proteomics suggest that post-transcriptional mechanisms do not play a major role in balancing the expression of Z-linked genes.
We are grateful to Lu Dabing (Soochow University, Suzhou, China) for providing Schistosoma japonicum samples, to Ariana Macon (IST Austria) and Georgette Stovall (JLU Giessen) for technical assistance, to IT support at IST Austria for providing optimal environment to bioinformatic analyses, and to the Vicoso lab for comments on the manuscript.
Picard MAL, Cosseau C, Ferré S, et al. Evolution of gene dosage on the Z-chromosome of schistosome parasites. eLife. 2018;7. doi:10.7554/eLife.35684
Picard, M. A. L., Cosseau, C., Ferré, S., Quack, T., Grevelding, C., Couté, Y., & Vicoso, B. (2018). Evolution of gene dosage on the Z-chromosome of schistosome parasites. ELife, 7. https://doi.org/10.7554/eLife.35684
Picard, Marion A L, Celine Cosseau, Sabrina Ferré, Thomas Quack, Christoph Grevelding, Yohann Couté, and Beatriz Vicoso. “Evolution of Gene Dosage on the Z-Chromosome of Schistosome Parasites.” ELife 7 (2018). https://doi.org/10.7554/eLife.35684.
M. A. L. Picard et al., “Evolution of gene dosage on the Z-chromosome of schistosome parasites,” eLife, vol. 7, 2018.
Picard MAL, Cosseau C, Ferré S, Quack T, Grevelding C, Couté Y, Vicoso B. 2018. Evolution of gene dosage on the Z-chromosome of schistosome parasites. eLife. 7.
Picard, Marion A. L., et al. “Evolution of Gene Dosage on the Z-Chromosome of Schistosome Parasites.” ELife, vol. 7, e35684, eLife Sciences Publications Ltd, 2018, doi:10.7554/eLife.35684.
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