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Co-option of the limb patterning program in cephalopod eye development
Stephanie Neal1,2, Kyle J McCulloch1,2, Francesca R Napoli1,2
1John Harvard Distinguished Science Fellowship Program, Harvard University, Cambridge, MA, 02138, USA.
BMC Biology
|January 5, 2022
Summary
Cephalopod lens development co-opts the bilaterian limb patterning program. This genetic program
Area of Science:
- Developmental biology
- Evolutionary developmental biology
- Genetics
Background:
- Similar genetic programs guide analogous structure development across Metazoa.
- Cephalopods possess a sophisticated visual system with a unique lens, crucial for complex behaviors.
- Molecular genetics of cephalopod lens development remain largely unexplored.
Purpose of the Study:
- To investigate the molecular mechanisms underlying cephalopod lens development.
- To identify conserved or repurposed genetic programs in cephalopod visual system evolution.
Main Methods:
- Comparative gene expression analysis in squid (Doryteuthis pealeii).
- Assessment of transcription factor and Wnt signaling pathway involvement.
- Investigating the role of SP6-9 gene duplication.
Main Results:
- Identified co-option of the bilaterian limb patterning program in cephalopod lens development.
- Observed radial expression of key limb patterning genes (SP6-9, Dlx, Pbx, Meis, Prdl homolog).
- Discovered a reversed role for Wnt signaling, with ectopic signaling causing lens loss.
Conclusions:
- The limb patterning program may serve a broader role in radial patterning.
- Gene duplication, specifically of SP6-9, might facilitate program co-option.
- Canonical genetic programs are adaptable for novel structure development in evolution.
