Region-specific Transcriptomic Signatures in Alzheimer's Disease: A Meta-analysis of Vulnerable Brain Regions Reveals MicroRNA-hub Gene Regulatory Networks.

Overview

1. Department of Neuroscience, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran
2. Epilepsy Research Center, Shiraz University of Medical Sciences, Shiraz, Iran
3. Department of Radiology, School of Medicine, Medical Imaging Research Center, Shiraz, Iran
4. Shiraz Transplant Research Center, Abu-Ali Sina Hospital, Shiraz University of Medical Sciences, Shiraz, Iran
5. Department of Neurology, School of Medicine, Clinical Neurology Research Center, Shiraz, Iran
6. Department of Medical Biotechnology, School of Advanced Medical Sciences and Technologies, Shiraz University of Medical Sciences, Shiraz, Iran

Abstract

Background: Alzheimer’s disease (AD) is characterized by progressive neurodegeneration in regionally vulnerable brain areas, yet molecular insights into early pathogenic mechanisms remain limited.

Methods: We conducted a meta-analysis of transcriptomic datasets from brain regions affected in early-to-moderate AD – including entorhinal cortex, CA1 hippocampus, angular gyrus, and frontal cortex synaptoneurosomes – using data from seven mRNA and one microRNA (miRNA) microarray studies (GSE16759, GSE110226, GSE37264, GSE26972, GSE36980, GSE37263, GSE39420, and GSE157239). Preprocessing included background correction, log2 transformation, quantile normalization, and batch correction via ComBat. Differentially expressed features were defined as false discovery rate <0.05 and | logFC| ≥ 1.23 (genes) or ≥ 2 (miRNAs).

Results: We identified 172 differentially expressed genes (122 upregulated and 50 downregulated) and 82 significant miRNAs. Hub genes included Inositol-trisphosphate 3-kinase B (ITPKB), Synaptotagmin 1, Dystrobrevin alpha (DTNA), X Inactive Specific Transcript, and Regulator of G protein signaling 4 (RGS4). Functional enrichment highlighted calcium signaling, synaptic failure, and neuroinflammation. Notably, hsa-miR-30d-5p was predicted to target both ITPKB and DTNA, suggesting a regulatory axis linking miRNA dysregulation to calcium dyshomeostasis. Receiver operating characteristic analysis revealed that only RGS4 showed moderate discriminative capacity (area under the curve [AUC] =0.70), while other hub genes (e.g., ITPKB, AUC = 0.40) exhibited below-chance performance, underscoring the limitations of single-gene classifiers in postmortem tissue.

Conclusion: This study provides mechanistic hypotheses – rather than diagnostic biomarkers – by uncovering region-specific, miRNA-mediated regulatory networks in AD-affected brain tissues. Future validation in accessible biofluids is essential before clinical translation.

Reproduced under the paper's license (CC BY-NC-SA), from the paper cited above.

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Data

Datasets cited

• geo:GSE16759, at NCBI GEO; found in the text, “Introduction”

Other data links

• ncbi.nlm.nih.gov/geo, NCBI; found in the text, “Data sources and selection of eligible gene…”

Versions

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Version 2, 28 September 2026

• Issue: n/a → 6

Version 1, 27 September 2026: the first record

Recorded: type, language, journal, volume, pages, dates, 8 authors, 4 keywords, 30 references.

Cite

This paper

Jaberi, K. R., Alashti, S. K., Hooshmandi, S., Vatankhah, P., Haghighi, M. R., Savardashtaki, A., Aligholi, H., & Jaberi, A. R. (2026). Region-specific Transcriptomic Signatures in Alzheimer's Disease: A Meta-analysis of Vulnerable Brain Regions Reveals MicroRNA-hub Gene Regulatory Networks. Journal of medical signals and sensors, 16(6), 14. https://doi.org/10.4103/jmss.jmss_70_25

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