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Published on: March 17, 2016
Circular RNA Expression in the Brain of a Neonatal Rat Model of Periventricular White Matter Damage
Lihua Zhu1, Ruibin Zhao2, Li Huang3
1Institute of clinical, Jiangsu Health Vocational College, Nanjing, China.
Insights
Periventricular white matter damage (PWMD) in preterm infants involves altered circular RNA (circRNA) expression in brain tissue. These circRNAs may serve as novel diagnostic and therapeutic targets for PWMD.
Area of Science:
- Neuroscience
- Molecular Biology
- Genomics
Background:
- Periventricular white matter damage (PWMD) is a primary neurological injury in surviving preterm infants.
- Understanding the molecular mechanisms underlying PWMD is crucial for developing effective treatments.
Purpose of the Study:
- To investigate global changes and characteristics of circular RNA (circRNA) expression in rat brains with PWMD.
- To identify potential diagnostic and therapeutic targets for PWMD.
Main Methods:
- Deep RNA sequencing was used to compare circRNA expression profiles in PWMD rat brains versus control tissues.
- Bioinformatics, quantitative reverse-transcription polymerase chain reaction (qRT-PCR), Gene Ontology (GO), and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were performed.
- Network analysis predicted circRNA-microRNA-target gene interactions.
Main Results:
- 2151 circRNAs were dysregulated in PWMD brain tissues, with 52 over-expressed and 46 under-expressed among 98 significantly altered circRNAs.
- Glutamatergic synapse and VEGF signaling pathways, linked to hypoxia/ischemia, were enriched.
- Relationships between specific microRNAs (miRNAs) and HIF-1α, and potential associations with target genes, were identified.
Conclusions:
- Distinct circRNA expression patterns indicate active response to hypoxia-ischemia in PWMD.
- Identified circRNAs represent potential novel diagnostic and therapeutic targets for PWMD.
Background/Aims:
Periventricular white matter damage (PWMD) is the predominant neurologic lesion in preterm infants who survive brain injury. In this study, we assessed the global changes in and characteristics of the transcriptome of circular RNAs (circRNAs) in the brain tissues of rats with PWMD.
Methods:
We compared the expression profiles of circRNAs in brain samples from three rats with PWMD and three paired control tissues using deep RNA sequencing. Bioinformatics analysis was applied to investigate these differentially expressed circRNAs, and quantitative reverse-transcription polymerase chain reaction (qRT-PCR) analysis was performed to confirm the results. Gene Ontology (GO) and Kyoto Encyclopedia of Genes and Genomes (KEGG) analyses were performed to predict associated cell signaling pathways and functions. Network analysis was performed to predict circRNAs-microRNAs, and target genes related to PWMD.
Results:
A total of 2151 more reliable circRNAs were dysregulated in the brain tissues of rats with PWMD, indicating a potential role in the condition. Of the 98 circRNAs significantly differentially expressed in rat brains with PWMD (P< 0.05), 52 were significantly over-expressed and 46 were significantly under-expressed. The expression profiles of seven of 10 randomly selected circRNAs were confirmed by qRT-PCR analysis. The glutamatergic synapse pathway and the VEGF signaling pathway, both associated with hypoxia/ischemia induced brain damage, were inriched. Relationship between miRNA (rno-miR-433-3p and rno-miR-206-3p) and HIF-1α were evident and potential associations between chr6: 48820833|48857932 and their target genes (rno-miR-433-3p and rno-miR-206-3p) were identified.
Conclusion:
The distinct expression patterns of circRNAs in the brain tissues of rats with PWMD suggest that circRNAs actively respond to hypoxia-ischemia. These findings could assist the development of novel diagnostic and therapeutic targets for PWMD therapy.
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