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  • Bruno Vellutini 15:03 on 2011/07/15 Permalink
    Tags: , , writing   

    Polypide development in ancestrula and budding 

    Are the developmental mechanisms regulating the polypide development in the ancestrula similar to the mechanisms regulating polypide development after asexual budding?

    Look for possibly related articles.

     
  • Bruno Vellutini 14:52 on 2011/07/15 Permalink
    Tags: comparative, writing   

    Comparative development of cyphonautes and coronates 

    In-depth comparison of cyphonautes and coronates body patterning.

    Early development

    • How different are the fate maps between the two types of larvae?
    • What are the key differences in the regulation of development that might be related to the differing morphology?

    Metamorphosis

    • Which tissues originate which adult structures and is there any variation when comparing cyphonautes and coronates?
    • Which organs will form the cystid in different larvae?
    • Which tissues form the polypide rudiment in different larvae?

    Questions notes

    Develop a method to discover which larval type is ancestral. How? Only six genera have cyphonautes and they are considered to be “more primitive”, Cheilostomes and Ctenostomes. Can the comparison of the early development patterning and gene expression between cyphonautes and coronates reveal any key regulatory mechanisms? Can I use cooption events to solve this? Absence of spiral cleavage in all bryozoans might indicate an early feature of the group. Brooding could have disrupted early development, or in a Buss (or Metchnikoff?) sense, allowed variation to appear. If first bryozoans were brooders, then are cyphonautes derived/specialized larvae? Does having similar cleavage mean something? Would cyphonautes have evolved by paedomorphosis of coronate-like larvae? Or vice-versa?

    Extra: Cyphonautes morphogenesis

    • How cyphonautes got flattened?
     
  • Bruno Vellutini 14:36 on 2011/07/15 Permalink
    Tags: , cell lineage, writing   

    Bryozoan cell lineage tracing 

    Elucidate the origins of larval and adult tissues of a bryozoan.

    [short background]

    Embryonic origin of larval structures

    Use cell lineage tracing to find the fate of cells after initial cleavages.

    • Which structures do they form and can this be understood as a regular ecto/meso/endo layer schema?
    • What is the fate of internalized cells after gastrulation?

    Development and embryonic origin of adult tissues

    • What is the fate of larval tissues, specially the blastemas?
    • Which adult structures do they form and how development occurs?
    • Formation of coelomic cavities during metamorphosis?

    Questions

    • Use gene expression patterns from typical spiral cleavage embryos to compare with bryozoan cleavage and maybe identify what might have happened during its loss.
     
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