Cracking open the blackbox of genotype-phenotype map: crossing the explanatory gap between micro- and macroevolution

Area of Science:

• Evolutionary Genetics
• Developmental Biology
• Phenotypic Variation

Background:

• Evolvability hinges on heritable phenotypic variation, but current models often overlook conserved traits.
• Slowly evolving traits, like body plan organization, are crucial for setting evolutionary boundaries.
• Understanding long-term evolutionary change necessitates examining both segregating and conserved trait variation.

Purpose of the Study:

• To propose a framework for understanding evolutionary change by integrating variation in both segregating and conserved traits.
• To highlight the importance of developmental processes in generating and constraining phenotypic variation.
• To delineate conditions for diverse evolutionary patterns by analyzing genotype-phenotype mapping.

Main Methods:

• Conceptual analysis of evolutionary genetics principles.
• Decomposition of the genotype-phenotype (GP) map based on variational properties of developmental processes.
• Focus on vertebrate developmental processes: morphogenesis, growth, and maintenance.

Main Results:

• Different developmental processes (morphogenesis, growth, maintenance) possess distinct capacities for generating variation.
• Analyzing these processes separately and their interactions reveals how selection shapes evolutionary trajectories.
• This framework integrates the study of variation in both rapidly evolving and conserved traits.

Conclusions:

• A comprehensive understanding of evolution requires studying the interplay between variation in segregating and conserved traits.
• Decomposing the GP map by developmental process offers a powerful approach to predict evolutionary outcomes.
• This perspective facilitates a more nuanced understanding of how natural selection acts on different types of variation to produce diverse evolutionary patterns.