The role of self-organization in developmental evolution.

Area of Science:

• Developmental Biology
• Evolutionary Biology
• Systems Biology

Background:

• Gene regulatory networks (GRNs) involving transcription factors and cis-regulatory elements are central to understanding development and evolution.
• Comparative genomics reveals conserved sequences across species with divergent anatomies, questioning solely GRN-driven pattern formation.
• Transgenic studies demonstrate functional interchangeability of developmental elements, suggesting factors beyond gene products influence structure formation.

Purpose of the Study:

• To investigate the role of self-organization in development and evolution, beyond traditional gene regulatory network models.
• To examine the intrinsic rules and forces driving cellular and tissue coordination.
• To explore methodological and theoretical approaches for understanding the causal basis of self-organization.

Main Methods:

• Comparative sequence analysis across species.
• Transgenic experiments to assess functional interchangeability of regulatory elements.
• Analysis of regeneration experiments and in vitro structure formation.
• Examination of epigenetic and non-genetic determinants of pattern formation.

Main Results:

• Developmental patterns are influenced by self-organizing processes, not solely by gene products or signaling gradients.
• Epigenetic and non-genetic factors play a significant role in the self-formation of complex biological structures.
• Self-organization imposes coordination and holistic order on cells and tissues through intrinsic rules.

Conclusions:

• Self-organization is a critical, underappreciated mechanism in developmental and evolutionary biology.
• Understanding self-organization requires moving beyond solely genetic and protein-interaction-centric models.
• Further research into intrinsic cellular and tissue rules is crucial for regenerative medicine and evolutionary studies.