Work

Signals from the head and germinative region differentially regulate regeneration competence of the tapeworm Hymenolepis diminuta

Year: 2025

Type: article

Abstract: Competence to regenerate lost tissues varies widely across species. The rat tapeworm Hymenolepis diminuta undergoes continual cycles of shedding and regenerating thousands of reproductive segments to propagate the species. Despite its prowess, H. diminuta can only regenerate posteriorly from a singular tissue: the neck or germinative region (GR). What cells and signaling pathways restrict regeneration competence to the GR? In this study, we show that the head regulates regeneration competence by promoting maintenance of the GR and inhibiting proglottid formation in a distance-dependent manner. Anterior-posterior patterning within the GR provides local signals that contribute to these responses. βcat1 is necessary for stem cell maintenance, proliferation and proglottidization, and sfrp is necessary for maintaining the GR at its proper length. Our study demonstrates that the head organizes a balance of pro- and anti-regeneration signals that must be integrated together and therefore control competence to regenerate.

Source: Development

DOI: 10.1242/dev.204781

Authors: Elise McCollough Nanista, Landon Elizabeth Poythress, Isabell Reese Skipper, Trevor Haskins, Marieher Félix Cora, Tania Rozario

Institutions: University of Georgia, University of Puerto Rico at Cayey

Language: English

Topic: Planarian Biology and Electrostimulation

Subfield: Molecular Biology

Field: Biochemistry, Genetics and Molecular Biology

Domain: Life Sciences

Open Access status: hybrid

Funders: Division of Intramural Research, National Institute of Allergy and Infectious Diseases, University of Georgia, National Institutes of Health, National Institute of Allergy and Infectious Diseases

Awards: G374479081, G4632938726, G8499062571, Tapeworm stem cells as drivers of regeneration and reproduction