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Dauer signalling pathway model for Haemonchus contortus.

Guangxu Ma1, Tao Wang1, Pasi K Korhonen1

  • 1Department of Veterinary Biosciences, Melbourne Veterinary School, The University of Melbourne, Parkville, VIC, 3010, Australia.

Parasites & Vectors
|May 1, 2019
PubMed
Summary
This summary is machine-generated.

This study models dauer-associated signalling pathways in the parasitic worm Haemonchus contortus, revealing conserved and divergent mechanisms compared to C. elegans. Findings suggest key roles for specific genes and post-translational modifications in parasite development and potential therapeutic targets.

Keywords:
Dauer signalling pathwayHaemonchus contortusPhospho-proteomic analysisProteomic analysisTranscriptomic analysis

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Area of Science:

  • Parasitology
  • Molecular Biology
  • Genomics

Background:

  • Signalling pathways are well-studied in free-living nematodes like C. elegans, but poorly understood in parasitic species.
  • Haemonchus contortus is an economically significant parasitic worm, making its biology a key research area.

Purpose of the Study:

  • To construct a model of dauer-associated signalling pathways in Haemonchus contortus.
  • To compare these pathways with those in C. elegans to identify conserved and divergent mechanisms.

Main Methods:

  • Utilized genomic and transcriptomic datasets to identify gene homologues in H. contortus.
  • Analyzed developmental transcriptomic, proteomic, and phosphoproteomic profiles.
  • Studied selected molecular structures.

Main Results:

  • Inferred 61 gene homologues for cyclic guanosine monophosphate (cGMP), transforming growth factor-β (TGF-β), insulin-like growth factor 1 (IGF-1), and steroid hormone signalling pathways.
  • Identified fewer insulin-like peptide genes in H. contortus compared to C. elegans, suggesting evolutionary divergence.
  • Observed similar transcription profiles between H. contortus infective L3 stage and C. elegans dauer stage.
  • Found high transcriptional levels for G protein-coupled receptors (GPCRs), TGF-β, insulin-like ligands, and DAF-16 in H. contortus infective L3 stage.
  • Noted significant protein expression and phosphorylation, indicating post-translational modifications in the L3 stage.
  • Confirmed structural similarity in DAF-12 ligand binding domain, suggesting conserved steroid signalling.

Conclusions:

  • The developed pathway model provides a foundation for investigating H. contortus development and parasite-host interactions.
  • Identified potential regulatory mechanisms including microRNAs, phosphorylation, and lipids.
  • Highlights opportunities for discovering novel therapeutic targets for parasitic nematode control.