Different roads to form the same gut in nematodes
Wouter Houthoofd1, Maxime Willems, Sandra Vangestel
1Department of Biology, Ghent University, K. L. Ledeganckstraat 35, B-9000 Gent, Belgium.
Evolution & Development
|June 30, 2006
Summary
Different nematode species build their intestines in conserved ways, but some use unique developmental paths involving cell death and migration to achieve the same body plan.
Area of Science:
- Developmental biology
- Nematode biology
- Comparative embryology
Background:
- Gut morphogenesis is well-studied in Caenorhabditis elegans.
- Alternative intestinal development with programmed cell death observed in Panagrellus redivivus.
Purpose of the Study:
- Investigate nematode intestinal morphogenesis across species.
- Elucidate the role of programmed cell death in gut formation.
- Understand variations in achieving a conserved body plan.
Main Methods:
- Four-dimensional microscopy for 3D cellular-level gut formation analysis.
- Comparative study across six nematode species.
- Hypothesis generation based on observed developmental patterns.
Main Results:
- Gut formation pathways are highly conserved across distantly related nematodes.
- Panagrellus redivivus pattern, involving inward migration with mesoderm, found in Halicephalobus gingivalis.
- Mesoderm precursor positioning may delay intestinal bilateral symmetry, corrected by cell migration, elimination, and division.
Conclusions:
- Conserved nematode body plans can arise from diverse developmental mechanisms.
- Programmed cell death and cell migration play key roles in achieving a symmetrical intestine.
- Spatial constraints from mesoderm influence developmental pathways.
