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Altered Short Non-Coding RNA Landscape in the Hippocampus of a Mouse Model of CDKL5 Deficiency Disorder
Bilal El-Mansoury1,2, Adrian Hayes3, Samuel Egan1,2
1Department of Physiology & Medical Physics, RCSI University of Medicine & Health Sciences, D02 YN77 Dublin, Ireland.
Biomolecules
|November 27, 2025
Summary
CDKL5 deficiency disorder (CDD) involves extensive changes in non-coding RNAs (ncRNAs), impacting gene expression. These ncRNAs may serve as biomarkers for this rare neurological condition.
Area of Science:
- Neuroscience
- Genetics
- Molecular Biology
Background:
- CDKL5 deficiency disorder (CDD) is a rare epileptic encephalopathy linked to CDKL5 gene mutations.
- Current CDD treatments are symptomatic, lacking disease-modifying strategies.
- The role of non-coding RNAs (ncRNAs) in CDD pathogenesis remains unexplored.
Purpose of the Study:
- To investigate the impact of CDKL5 deficiency on the short non-coding RNA landscape.
- To identify potential ncRNA biomarkers for CDD.
- To elucidate molecular mechanisms underlying CDD.
Main Methods:
- Small RNA sequencing was performed on the hippocampus of a Cdkl5 exon 6 deletion mouse model.
- Analysis focused on short non-coding RNA species including miRNAs, tRNAs, piwi-RNAs, snoRNAs, and snRNAs.
- Differential expression of specific miRNAs (miRNA-200c-3p, miRNA-384-3p) was validated.
Main Results:
- CDKL5 deficiency caused widespread, bidirectional alterations in ncRNA expression.
- Multiple ncRNA classes, including miRNAs, were significantly dysregulated.
- Two specific miRNAs, miRNA-200c-3p and miRNA-384-3p, were validated as dysregulated in CDD mice.
Conclusions:
- Loss of CDKL5 profoundly affects the non-coding transcriptional landscape.
- Dysregulated ncRNAs in CDD present potential diagnostic biomarkers.
- Understanding ncRNA dysregulation offers insights into CDD pathophysiology and therapeutic targets.
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