A P450-centric view of plant evolution.

Area of Science:

• Plant biology
• Enzymology
• Evolutionary biology

Background:

• Cytochrome P450s (CYPs) are the largest enzyme family in plants, crucial for metabolism.
• Their evolution provides insights into plant metabolism architecture and adaptation.
• The angiosperm CYP superfamily evolved from 11 ancestral genes with diverse evolutionary trajectories.

Purpose of the Study:

• To investigate the evolutionary dynamics of plant Cytochrome P450s (CYPs).
• To understand the role of gene duplication bursts in plant adaptation and speciation.
• To compare CYP complements (CYPomes) in rice and Brachypodium distachyon to trace evolutionary steps.

Main Methods:

• Comparative analysis of CYPomes in rice and Brachypodium distachyon.
• Phylogenetic analysis of CYP gene families.
• Identification of gene duplication patterns and selection pressures.

Main Results:

• The CYP71 clan shows accelerated gene duplication, comprising over half of plant CYPs and contributing to adaptation.
• Essential metabolic functions are maintained by CYPs under purifying selection, limiting diversification.
• Comparative CYPome analysis highlights long-term evolution of plant metabolism and convergent evolution events.

Conclusions:

• The evolution of new plant metabolic functions is a protracted, long-term process.
• Gene duplication bursts, particularly in the CYP71 clan, are significant drivers of plant adaptation and speciation.
• Comparative CYPome analysis is a valuable tool for identifying essential plant metabolic functions and guiding future research.