Canonical WNT signalling governs Echinococcus metacestode development.

Area of Science:

• Parasitology
• Developmental Biology
• Molecular Biology

Background:

• Alveolar echinococcosis (AE) is a lethal zoonosis caused by Echinococcus multilocularis.
• The Echinococcus metacestode exhibits unique posteriorized tissue organization.
• Canonical WNT (cWNT) signaling pathways pattern body axes in metazoans.

Purpose of the Study:

• To investigate the role of cWNT signaling in Echinococcus metacestode formation and growth.
• To determine if bcat-1, the effector of cWNT signaling, is critical for metacestode development.

Main Methods:

• RNA interference (RNAi) mediated knockdown of E. multilocularis bcat-1 gene.
• Primary parasite cell culture producing metacestode vesicles.
• Genome-wide transcriptomics and in situ hybridization.

Main Results:

• bcat-1 knockdown impaired vesicle formation and altered muscle organization.
• Gene expression showed a general anteriorization, with increased head-inducing factors.
• Metacestode-specific and posterior genes were downregulated, while anterior markers were overexpressed.

Conclusions:

• cWNT signaling is central to Echinococcus body-axis formation and posteriorization.
• This pathway drives metacestode growth and asexual proliferation.
• Findings suggest potential therapeutic targets for alveolar echinococcosis.