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Are paedomorphs actual larvae?

Alicia Tribondeau¹, Laurent M Sachs¹, Nicolas Buisine¹

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Developmental Dynamics : an Official Publication of the American Association of Anatomists

|February 2, 2021

Summary

This summary is machine-generated.

Amphibian development includes direct, biphasic, and paedomorphic life cycles. Research shows paedomorphs undergo a post-embryonic transition (PETr), distinct from metamorphosis, revealing complex life cycle variations.

Keywords:

metamorphosis paedomorphosis post embryonic transition thyroid hormone signaling urodeles

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Area of Science:

Developmental biology
Comparative endocrinology
Amphibian evolutionary biology

Background:

Amphibian life cycles are diverse, including direct, biphasic, and paedomorphic strategies.
Metamorphosis traditionally marks the post-embryonic transition (PETr), but paedomorphosis challenges this definition.
Paedomorphosis involves sexual maturity in larval forms, retaining juvenile features.

Purpose of the Study:

To investigate if paedomorphs undergo a post-embryonic transition (PETr).
To determine if PETr is distinct from metamorphosis in amphibians.
To re-evaluate amphibian life cycle complexity based on developmental transitions.

Main Methods:

Utilized high-throughput technologies and system biology approaches.
Integrated developmental endocrinology with novel datasets.
Analyzed historical data alongside new findings.

Main Results:

Paedomorph "larval" tissues exhibit a distinct developmental transition.
This transition serves as a marker for PETr, separate from metamorphosis.
Complex amphibian life cycles arise from the uncoupling of PETr and metamorphosis.

Conclusions:

The post-embryonic transition (PETr) is a fundamental developmental process in amphibians, not solely tied to metamorphosis.
Paedomorphosis represents a complex life cycle strategy characterized by the uncoupling of PETr and metamorphosis.
Biphasic life cycles are a specific instance where PETr and metamorphosis occur concurrently.