Dynamic whole-transcriptome landscape of acute bilirubin encephalopathy in newborns

Area of Science:

• Neuroscience
• Molecular Biology
• Genomics

Background:

• Neonatal hyperbilirubinemia poses risks of acute bilirubin encephalopathy (ABE).
• The precise molecular mechanisms of bilirubin-induced brain injury, particularly involving RNA, are not fully understood.
• Previous research identified various RNA types (mRNAs, lncRNAs, circRNAs, miRNAs) linked to brain injury, but their specific roles in ABE are unclear.

Purpose of the Study:

• To investigate the differentially expressed RNA profiles in a newborn acute bilirubin encephalopathy (ABE) rat model.
• To construct a time-series competing endogenous RNA (ceRNA) regulatory network.
• To identify potential molecular mechanisms underlying bilirubin-induced hippocampal damage.

Main Methods:

• Whole-transcriptome sequencing was performed on a newborn ABE rat model at multiple time points (6h, 12h, 24h).
• Bioinformatic analysis was used to identify differentially expressed (DE) mRNAs, lncRNAs, circRNAs, and miRNAs.
• A time-series ceRNA regulatory network was constructed, and RNA expression trends were validated using quantitative real-time polymerase chain reaction (qRT-PCR).

Main Results:

• Significant numbers of differentially expressed mRNAs, miRNAs, lncRNAs, and circRNAs were identified at different time points.
• These DE RNAs are predominantly involved in inflammation, immunity, metabolism, cell death, and neurodevelopmental regulation.
• Time-series ceRNA networks were successfully constructed, and qRT-PCR results generally corroborated the RNA-seq findings.

Conclusions:

• This study provides a comprehensive temporal landscape of RNA expression changes in neonatal ABE.
• The established ceRNA networks offer insights into the molecular pathways driving bilirubin-induced hippocampal injury.
• Further research is needed to validate these findings and explore their translational potential in human ABE.