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Related Experiment Videos

Developmental changes in the adhesive disk during Giardia differentiation.

Daniel Palm1, Malin Weiland, Andrew G McArthur

  • 1Microbiology and Tumor Biology Center, Karolinska Institutet, SE-171 77 Stockholm, Sweden.

Molecular and Biochemical Parasitology
|April 27, 2005
PubMed
Summary

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Giardia lamblia uses its ventral disk for attachment. This organelle disassembles during encystation, storing protein fragments in cysts for rapid reassembly upon excystation.

Area of Science:

  • Parasitology
  • Cell Biology
  • Molecular Biology

Background:

  • Giardia lamblia is a protozoan parasite that infects the mammalian small intestine.
  • Attachment to the host intestine is crucial for infection and mediated by the ventral disk.

Purpose of the Study:

  • To investigate the composition and structure of the Giardia lamblia ventral disk throughout its life cycle.
  • To identify novel proteins involved in ventral disk function and regulation.

Main Methods:

  • Characterization of ventral disk composition and structure.
  • Identification of a new disk protein, SALP-1, using biochemical and proteomic approaches.
  • Analysis of gene and protein expression during encystation and excystation using Serial Analysis of Gene Expression (SAGE) and 2D protein gels.

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Main Results:

  • A new immunodominant disk protein, SALP-1, related to striated fiber-assemblin (SFA), was identified.
  • The ventral disk disassembles into four fragments during encystation and is stored within the cyst.
  • While mRNA levels for disk proteins decrease during encystation, protein levels remain relatively constant, indicating post-transcriptional regulation.
  • The four disk fragments are rapidly reassembled into two new ventral disks during early excystation.

Conclusions:

  • Giardia lamblia stores ventral disk proteins within the cyst as pre-assembled fragments.
  • This storage mechanism facilitates rapid reassembly of functional ventral disks during excystation, ensuring efficient host colonization.
  • SALP-1 is a key component of the ventral disk, contributing to its structural integrity and immunogenicity.