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Embryonic versus blastogenetic development in the compound ascidian Botryllus schlosseri: insights from Pitx
Stefano Tiozzo1, Lionel Christiaen, Carole Deyts
1Dipartimento di Biologia, Università di Padova, Via U. Bassi 58/B 35121 Padova, Italy. s.tiozzo@unipd.it
Summary
Colonial ascidians use similar gene activities for sexual and asexual reproduction. The Pitx gene is crucial for both embryogenesis/metamorphosis and asexual development in Botryllus schlosseri.
Area of Science:
- Developmental biology
- Evolutionary developmental biology
- Marine biology
Background:
- Colonial ascidians exhibit diverse reproductive strategies, including sexual reproduction via embryogenesis and asexual reproduction through budding.
- Two distinct developmental pathways, embryogenesis/metamorphosis and asexual blastogenesis, lead to the formation of zooids in ascidians.
Purpose of the Study:
- To compare gene activity during embryogenesis/metamorphosis and asexual development in the compound ascidian Botryllus schlosseri.
- To investigate the role of the Pitx gene in both sexual and asexual reproductive processes.
Main Methods:
- Cloning of the Botryllus schlosseri Pitx ortholog (Bs-Pitx).
- Expression analysis of Bs-Pitx during embryogenesis, metamorphosis, and blastogenesis.
Main Results:
- Bs-Pitx expression domains were conserved during organogenesis in both embryogenesis/metamorphosis and blastogenesis.
- Identical expression was observed in the stomodeum/neural complex and asymmetric left-sided digestive system.
- Early-stage expression patterns of Bs-Pitx differed significantly between the two developmental pathways.
Conclusions:
- The study provides the first evidence that a key developmental gene, Bs-Pitx, is utilized in largely similar ways across distinct developmental sequences in ascidians.
- This suggests a conserved genetic mechanism underlying zooid formation, regardless of reproductive mode.