Tail bud determination in the vertebrate embryo

Area of Science:

• Developmental biology
• Evolutionary biology
• Chordate embryology

Background:

• The post-anal tail is a defining feature of chordates, yet its developmental mechanisms remain largely unknown.
• Tail development shares organizational similarities with the main body axis, suggesting related formation processes.
• Understanding tail formation is crucial for comprehending the broader vertebrate body plan evolution.

Purpose of the Study:

• To investigate the origins and determination of the tail bud in vertebrate embryos.
• To elucidate the cellular and tissue interactions involved in tail formation.
• To propose a novel model for tail bud development.

Main Methods:

• Utilized Xenopus laevis as a model organism for studying vertebrate development.
• Performed exogastrulae manipulations to assess tail formation in altered embryonic conditions.
• Conducted transplantation experiments on the neural plate of stage 13 neurulae to induce supernumerary tails.

Main Results:

• Demonstrated that the tail bud arises from interactions between distinct posterior embryonic tissue zones at the neurula stage.
• Showcased that specific tissue interactions are necessary for normal tail formation.
• Successfully generated embryos with supernumerary tails through targeted neural plate manipulations.

Conclusions:

• Proposed the NMC model for tail bud determination, highlighting interactions between neural plate territories and posterior mesoderm.
• The NMC model explains tail bud initiation through the interplay of specific embryonic regions.
• This research provides a new framework for understanding the genetic and cellular basis of tail development.