Seeing the unseen in characterizing RNA editome during rice endosperm development

Area of Science:

• Plant Biology
• Molecular Biology
• Genetics

Background:

• Rice endosperm is vital for seed germination and yield.
• RNA editing is a critical post-transcriptional process for plant development.
• RNA editing in rice endosperm development remains underexplored.

Purpose of the Study:

• To systematically analyze the RNA editome during rice endosperm development.
• To understand the impact of RNA editing on mitochondrial protein structure and function.
• To identify potential RNA editing factors involved in rice endosperm development.

Main Methods:

• Systematic analysis of the rice endosperm RNA editome.
• Comparative analysis of RNA editing sites and frequencies.
• Genome-wide screening for pentatricopeptide repeat (PPR) proteins.
• Construction of PPR-RNA binding profiles.

Main Results:

• Most RNA editing sites in rice endosperm are C-to-U recoding events in coding sequences (CDS) within mitochondria.
• These edits increase hydrophobic amino acids and alter mitochondrial protein structures.
• CDS-recoding sites show high editing frequencies and low variability, with conserved amino acid changes across land plants.
• Mitochondrial genes were classified into three groups based on distinct CDS-recoding patterns.
• Candidate PPR editing factors potentially involved in rice endosperm development were identified.

Conclusions:

• RNA editing significantly impacts mitochondrial protein evolution and function in rice endosperm.
• The identified PPR proteins are potential regulators of RNA editing in rice endosperm development.
• This study provides fundamental insights into the RNA editing machinery governing rice endosperm development.