Genome assembly, sex-biased gene expression and dosage compensation in the damselfly Ischnura elegans

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The evolution of sex chromosomes, and patterns of sex-biased gene expression and dosage compensation, are poorly known among early winged insects such as odonates. We assembled and annotated the genome of Ischnura elegans (blue-tailed damselfly), which, like other odonates, has a male-hemigametic sex-determining system (X0 males, XX females). By identifying X-linked genes in I. elegans and their orthologs in other insect genomes, we found homologies between the X chromosome in odonates and chromosomes of other orders, including the X chromosome in Coleoptera. Next, we showed balanced expression of X-linked genes between sexes in adult I. elegans, i.e. evidence of dosage compensation. Finally, among the genes in the sex-determining pathway only fruitless was found to be X-linked, while only doublesex showed sex-biased expression. This study reveals partly conserved sex chromosome synteny and independent evolution of dosage compensation among insect orders separated by several hundred million years of evolutionary history.


Enheter & grupper
Externa organisationer
  • Catholic University of Leuven
  • Instituto de Ecología A.C.
  • The New Zealand Institute for Plant & Food Research Limited, Nelson, New Zealand
  • University of Auckland

Ämnesklassifikation (UKÄ) – OBLIGATORISK

  • Genetik


Sidor (från-till)1828-1837
Antal sidor10
Utgåva nummer4
StatusPublished - 2021 jul 1
Peer review utfördJa