Cryptic Genetic Variation in Evolutionary Developmental Genetics.

Area of Science:

• Evolutionary developmental genetics
• Quantitative genetics
• Molecular evolution

Background:

• Traditional approaches in evolutionary developmental genetics focus on inter-species divergence (molecular evolutionists) or intra-species variation (quantitative geneticists).
• Most complex traits exhibit infinitesimal architecture, influenced by numerous genetic loci, posing challenges for existing evolutionary frameworks.
• Bridging macro- and micro-evolutionary concepts requires understanding phenomena like robustness, plasticity, and lability.

Purpose of the Study:

• To synthesize molecular evolution and quantitative genetics perspectives in evolutionary developmental genetics.
• To explore how robustness, plasticity, and lability potentiate major evolutionary changes.
• To propose mechanisms like cryptic genetic variation and conditional neutrality for developmental transitions and novelty.

Main Methods:

• Conceptual synthesis of existing theories in evolutionary developmental genetics.
• Discussion of phenomena such as robustness, plasticity, lability, cryptic genetic variation, and conditional neutrality.
• Integration of genome-wide association study findings on trait architecture.

Main Results:

• Robustness, plasticity, and lability act as bridges between macro- and micro-evolutionary scales.
• Cryptic genetic variation and conditional neutrality enable developmental system drift within canalized processes.
• These mechanisms facilitate developmental transitions and the evolution of novel traits.

Conclusions:

• A unified understanding of evolutionary developmental genetics requires integrating molecular and quantitative approaches.
• Adaptation, divergence, drift, and stability are underpinned by quantitative genetic processes.
• These underlying processes are not fully observable through continuously varying visible traits alone.