Evolution of gene regulatory networks controlling body plan development

Area of Science:

• Developmental Biology
• Evolutionary Biology
• Genetics

Background:

• Animal morphology evolves through changes in gene regulatory networks (GRNs).
• Cis-regulatory modules, controlling gene expression, are a primary target for evolutionary modification within GRNs.

Purpose of the Study:

• To investigate the causes and consequences of gene regulatory network evolution.
• To understand how alterations in GRN structure contribute to evolutionary change in animal form.

Main Methods:

• Analysis of gene regulatory network (GRN) structure.
• Comparative genomics to identify conserved and flexible GRN components.
• Developmental and evolutionary pathway analysis.

Main Results:

• GRN subcircuits exhibit a mosaic evolutionary history, with some being ancient and others recently derived.
• Alterations in cis-regulatory elements are a significant driver of GRN evolution.
• This mosaic view explains hierarchical patterns in phylogeny and discontinuous changes in the fossil record.

Conclusions:

• The evolution of GRNs is a complex process involving both ancient and novel components.
• Understanding GRN evolution is crucial for explaining macroevolutionary patterns.
• The flexibility of GRNs allows for adaptation and diversification of animal body plans.