From embryos to embryoids: How external signals and self-organization drive embryonic development

Area of Science:

• Developmental Biology
• Stem Cell Biology
• Systems Biology

Background:

• Classical view: Embryonic development driven by external signals.
• Emerging evidence: Intrinsic self-organization plays a key role.
• Stem cell models (embryoids) demonstrate self-organization in vitro.

Purpose of the Study:

• Review self-organizing behaviors in embryoid models.
• Reconcile new findings with classical developmental biology.
• Propose a model of guided self-organization.

Main Methods:

• Literature review of embryoid models.
• Analysis of self-organization mechanisms.
• Synthesis of classical and novel developmental concepts.

Main Results:

• Embryoids recapitulate key aspects of embryogenesis through self-organization.
• Patterning and morphogenesis arise from combined exogenous and endogenous factors.
• Self-organization is a fundamental property of embryonic development.

Conclusions:

• Embryonic development is a guided self-organizing process.
• External signals guide, but do not solely direct, development.
• Investigating self-organization requires a multidisciplinary approach.