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Periodic calcium waves cross ascidian eggs after fertilization
J E Speksnijder1, C Sardet, L F Jaffe
1Marine Biological Laboratory, Woods Hole, Massachusetts 02543.
Developmental Biology
|November 1, 1990
Summary
Fertilized ascidian eggs exhibit periodic calcium pulses that propagate as waves. These waves, initiated in different egg regions, may play a role in pattern formation or meiosis completion.
Area of Science:
- Developmental Biology
- Cellular Physiology
Background:
- Fertilization triggers periodic calcium pulses in ascidian eggs.
- Previous research documented these pulses but lacked detailed spatial analysis.
Purpose of the Study:
- To investigate the spatial pattern and initiation sites of calcium pulses in ascidian eggs.
- To explore the potential roles of these calcium waves in early development.
Main Methods:
- Observation of calcium pulse propagation patterns.
- Analysis of initiation regions and wave dynamics post-fertilization.
Main Results:
- Calcium pulses originate from discrete regions and propagate as waves across the egg.
- Early pulses initiate in the animal hemisphere, while later pulses originate from the vegetal pole.
- Vegetal pole calcium waves are associated with egg surface contraction and repeated calcium exposure.
Conclusions:
- Ascidian calcium waves exhibit distinct spatial patterns and initiation dynamics.
- These repetitive calcium events may be crucial for establishing embryonic patterns or completing meiosis.