Developmental changes of rRNA ribose methylations in the mouse

Area of Science:

• Molecular Biology
• Developmental Biology
• Genetics

Background:

• Ribose methylation is a crucial post-transcriptional modification of ribosomal RNA (rRNA).
• Previous studies primarily focused on human cancer cell lines, yielding limited insights into physiological methylation patterns.
• Understanding rRNA modifications in normal development is essential for comprehending ribosome function and heterogeneity.

Purpose of the Study:

• To investigate ribose methylation patterns in mouse adult tissues and during development using RiboMeth-seq.
• To identify differentially methylated sites and explore their dynamics throughout development.
• To provide evidence for ribosome heterogeneity arising from rRNA modifications during mouse development.

Main Methods:

• Utilized RiboMeth-seq, a sequencing-based profiling method, for comprehensive analysis of ribose methylations.
• Examined methylation patterns across various adult mouse tissues.
• Analyzed methylation dynamics in developing mouse tissues compared to adult counterparts.

Main Results:

• Nearly all investigated methylation sites were fully methylated in adult mouse tissues, differing from prior cancer cell line studies.
• A subset of methylation sites exhibited differential modification patterns during development, displaying clear dynamics.
• Demonstrated the first evidence of ribosome heterogeneity linked to rRNA modifications during mouse development.
• Observed a correlation between SNORD78 expression, alternative splicing of the GAS5 gene, and methylation levels at LSU-G4593 during development.

Conclusions:

• Ribose methylation patterns in mouse tissues are largely stable in adults but dynamic during development.
• Developmental changes in rRNA modifications contribute to ribosome heterogeneity in mice.
• The findings support the specialized ribosome hypothesis, suggesting functional diversity in ribosomes.