Behavioural manipulation in a grasshopper harbouring hairworm
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Behavioural Manipulation in a Grasshopper Harbouring Hairworm. By: Melissa Neis Biology 4800. Examples of Altered Behaviour Systems. Plasmodium Whirling Disease Dicrocoelium Leucochloridium. Hairworm and Grasshopper. Life Cycle.

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Behavioural manipulation in a grasshopper harbouring hairworm

Behavioural Manipulation in a Grasshopper Harbouring Hairworm

By: Melissa Neis

Biology 4800


Examples of altered behaviour systems
Examples of Altered Behaviour Systems Hairworm

  • Plasmodium

  • Whirling Disease

  • Dicrocoelium

  • Leucochloridium



Life cycle
Life Cycle Hairworm


How is the parasite manipulating the grasshoppers behaviour
How is the Parasite Manipulating the Grasshoppers Behaviour? Hairworm

Host: Long-Horned Grasshopper (Meconema thalassinum)

Hairworm: Spinochordodes tellinii


System studied
System Studied Hairworm

  • Examined the proteome expression of grasshoppers using gel electrophoresis and mass spectrometry

  • Collected specifically male grasshoppers to prevent sex specific results

  • Five groups Studied:

  • During Manipulation (DM)

    2. Uninfected at Night (Control: NC)

  • Before Manipulation (BM)

  • Uninfected during the day (control: ND)

  • After manipulation (AM)


Results
Results Hairworm

Grasshopper

Categories

Genetic Distance

Protein Spot Presence/Absence


Results1
Results Hairworm


What they discovered
What they discovered…. Hairworm

  • There were 6 proteins only present in the brains of manipulated grasshoppers.

  • However only two of those were produced by the hairworm acting as a form of protein mimicry.

  • They discovered that the over production of proteins pQ and pY produced by the hairworm acted on the development on the CNS of the grasshopper


Discussion
Discussion Hairworm

  • The expression of the 6 proteins in the manipulated grasshopper’s brain were believed to be the result of host immune response to the hairworm.

  • One protein is involved in directional movement

  • Two as neurotransmitters

  • One Involved with host apoptosis: regulation of cell death which is believed to induce a host inflammatory response


Conclusions
Conclusions Hairworm

  • Hairworm can alter the behaviour of the grasshopper by the production of biochemical interactions which cause the production of effective molecules which act directly on the host CNS


References
References Hairworm

  • Biron et al. (2005). Behavioural manipulation in a grasshopper harbouring hairworm: a proteomics approach, 272, 2117-2126


Questions
Questions? Hairworm