Coding and Non-Coding RNA Abnormalities in Bipolar Disorder.

Area of Science:

• Neuroscience
• Genetics
• Molecular Biology

Background:

• The molecular basis of bipolar disorder (BPD) is poorly understood.
• Previous studies focused on protein-coding RNAs, yielding inconsistent results.

Purpose of the Study:

• To investigate dysregulation across multiple RNA classes (coding, long non-coding, circular, alternative splicing) in bipolar disorder pathogenesis.
• To identify novel RNA targets for BPD research.

Main Methods:

• RNA sequencing of postmortem human medial frontal gyrus tissue from BPD patients and controls.
• Utilized non-polyadenylated libraries to capture diverse RNA types.
• Performed PCR validation and in silico functional analyses.

Main Results:

• Identified twenty differentially expressed protein-coding genes, some novel to BPD.
• Found ten differentially expressed long non-coding RNA transcripts.
• Detected increased alternative splicing events and altered levels of two circular RNAs (cNEBL, cEPHA3), including cEPHA3 with CNS developmental links.

Conclusions:

• RNA dysregulation in bipolar disorder extends beyond coding regions, involving multiple RNA classes.
• Findings suggest novel avenues for pharmacological and biomarker research in BPD.