Chaperones, Canalization, and Evolution of Animal Forms.

Area of Science:

• Developmental Biology
• Evolutionary Biology
• Molecular Biology

Background:

• Conrad Hal Waddington proposed canalization (developmental homeostasis) over 50 years ago.
• Heat Shock Protein 90 (Hsp90) was identified as a key player in developmental buffering, sparking interest in chaperones.
• Emerging research indicates diverse molecules, including DnaJ chaperones, are involved in canalization.

Purpose of the Study:

• To introduce the emerging role of DnaJ chaperones in developmental canalization.
• To discuss how buffering molecule expression can be modulated, affecting organismal development.
• To propose dynamic bet hedging as a mechanism influencing buffering molecule expression.

Main Methods:

• Literature review and synthesis of existing research on canalization and chaperones.
• Conceptual framework development linking dynamic bet hedging to buffering molecule expression.
• Analysis of maternal inheritance of developmental robustness.

Main Results:

• DnaJ chaperones represent a novel class of molecules involved in canalization.
• Expression levels of buffering molecules can be altered, leading to changes in developmental trajectories.
• Dynamic bet hedging is proposed as a significant factor in regulating these expression levels.

Conclusions:

• DnaJ chaperones are emerging as important contributors to developmental canalization.
• Dynamic bet hedging offers a molecular explanation for altered buffering molecule expression and its impact on development.
• Further investigation into dynamic bet hedging at the molecular level is crucial for understanding canalization and evolution.