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Reverse homeosis in homeotically reconstructed ribbonworms
M Tarpin1, W J Gehring, J Bièrne
1Laboratoire de Biologie Cellulaire et Moléculaire, Université de Reims Champagne-Ardenne, F-51 687 Reims, France. michel.tarpin@univ-reims.fr
Summary
Homeosis, the replacement of body parts, was reversed in ribbonworms through grafting. This study reveals how eyes regenerate or regress based on position, regulated by the LsPax-6 gene.
Area of Science:
- Developmental biology
- Genetics
- Regenerative medicine
Background:
- Homeosis, the transformation of one body part into another, is observed in segmented and non-segmented animals.
- Positional information guides body plan development even without clear segmentation.
Purpose of the Study:
- To investigate homeosis reversal and pattern regulation in ribbonworms (Lineus ruber).
- To explore the role of LsPax-6 in eye development, regeneration, and regression.
Main Methods:
- Artificial generation of homeotic ribbonworms using grafting techniques.
- Analysis of anterior-posterior (A-P) pattern regulation, including intercalary regeneration and transdetermination.
- Gene expression analysis of LsPax-6 in eye tissues.
Main Results:
- Grafted ribbonworms exhibited homeosis reversal, restoring a normal A-P pattern.
- Duplicated eye regions were eliminated, while missing regions regenerated.
- LsPax-6 expression was specific to regenerating, regenerated, and intact eye regions.
- Ribbonworm eyes were maintained or regressed based on their position along the A-P axis.
Conclusions:
- Ribbonworms can reverse homeosis and restore normal body patterns through regeneration and regression.
- LsPax-6 plays a crucial role in eye morphogenesis, maintenance, and regression, independent of overt segmentation.