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Evolution of gene dosage on the Z-chromosome of schistosome parasites.

Marion A L Picard | Celine Cosseau | Sabrina Ferré | Thomas Quack | Christoph G Grevelding | Yohann Couté | Beatriz Vicoso
eLife | 2018

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.

Pubmed ID: 30044216

Associated grants

  • Agency: Wellcome Trust, United Kingdom
    Id: 107475/Z/15/Z
  • Agency: Wellcome Trust, United Kingdom
  • Agency: Austrian Science Fund, International
    Id: P28842

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