Identification of Candidate Biomarkers and Signaling Pathways Associated with Alzheimer’s Disease Using Bioinformatics Analysis of Next Generation Sequencing Data and Molecular Docking Studies

{“title”:”Hitchhiking Genes and Repurposed Drugs Point to New Clues in the Fight Against Alzheimer’s”,”html”:”Alzheimer’s disease remains the most common cause of dementia worldwide and one of the most pressing unsolved problems in modern medicine, yet the molecular events that drive the slow destruction of memory and cognition are still only partially understood. A new bioinformatics study published in Ageing International by Basavaraj Vastrad, Shivaling Pattanashetti and Chanabasayya Vastrad has taken a computational scalpel to a large next-generation sequencing dataset of brain samples, systematically mining thousands of genes to find the handful that may matter most. Their work combines gene expression analysis, network biology, drug repurposing predictions and molecular docking into a single pipeline, offering a fresh and unusually wide-angle view of the disease at the level of individual molecules.

The team started with the publicly available sequencing dataset GSE203206, downloaded from the Gene Expression Omnibus repository, which contains transcriptomic data from 39 Alzheimer’s disease samples and 8 normal control samples. Using t-tests implemented in the limma R Bioconductor package, they identified 958 differentially expressed genes, with a strikingly symmetric result of 479 genes upregulated and 479 genes downregulated in the diseased brains. That balance alone is noteworthy, because it suggests widespread, bidirectional remodeling of the transcriptome rather than a simple overshoot of one or two processes, and it gives researchers a rich catalogue of candidate players to investigate.

To make biological sense of that gene list, the researchers ran Gene Ontology and pathway enrichment analyses. The upregulated genes clustered mainly around response to stimulus, cytoplasmic functions, small molecule binding and signal transduction, painting a picture of a brain under persistent stress, actively reorganizing its signaling machinery. The downregulated genes, by contrast, were enriched for multicellular organism development, cell junction biology, ion binding and cardiac conduction, hinting that fundamental structural and developmental programs are being quietly dismantled as the disease progresses. These divergent functional signatures reinforce the idea that Alzheimer’s is not one pathway gone wrong but an entire coordinated system drifting out of tune.

The next step was network analysis. By mapping the differentially expressed genes onto a protein-protein interaction network, the team built a graph containing 4,886 nodes and 10,342 edges, an enormous molecular web from which they extracted the most connected hubs. Ten genes rose to the top: HSP90AA1, FN1, KIT, YAP1, LSM2, SKP1, EIF5A2, TAF9, DDX39B and CDK7. Several of these names will be familiar to neuroscientists. HSP90AA1 encodes a heat shock protein chaperone already flagged by proteomic studies in the entorhinal cortex of Alzheimer’s patients, while FN1, the fibronectin gene, has recently been linked through rare genetic variants to protection against the notorious APOE ε4 risk factor.

Beyond static expression patterns, the study probed the regulatory layers that might control these hub genes. Constructing a microRNA-hub gene regulatory network, the authors identified hsa-mir-545-3p and hsa-miR-548f-5p as microRNAs that could help orchestrate Alzheimer’s pathology by fine-tuning multiple hub genes simultaneously. Similarly, a transcription factor-hub gene network implicated PLAG1 and MEF2A as master regulators that may be involved in disease development. This kind of multi-level regulation matters because it suggests that upstream control points, rather than individual downstream genes, could offer the most efficient targets for intervention, and because non-coding RNAs and transcription factors are increasingly seen as versatile biomarkers in neurodegeneration.

Perhaps the most clinically intriguing part of the work is the drug-hub gene interaction analysis, which predicted four existing drug molecules as candidates for Alzheimer’s treatment: Sulindac, Infliximab, Norfloxacin and Gemcitabine. The logic of repurposing is simple and appealing. These compounds already have established safety profiles, known pharmacokinetics and, in some cases, mechanisms that touch inflammation or cell survival, processes central to Alzheimer’s biology. Sulindac is a nonsteroidal anti-inflammatory drug, Infliximab is an antibody targeting tumor necrosis factor, and both speak to the chronic inflammatory component that has shadowed Alzheimer’s research for decades. Gemcitabine and Norfloxacin add further molecular diversity to the candidate pool.

To test these predictions computationally, the researchers performed molecular docking between hub gene products and corresponding active molecules. The docking analysis revealed that Isocryptomerin and Macrophylloside D, natural product-derived compounds, showed strong binding activities to HSP90AA1 and FN1 respectively. Docking scores cannot substitute for wet-lab validation, but favorable computed binding poses provide a rational starting point for medicinal chemists and suggest that these molecules are worth experimental follow-up as potential modulators of the disease’s most central protein hubs.

The study also evaluated the clinical diagnostic potential of the hub genes using receiver operating characteristic curve analysis, a standard method for estimating how well a biomarker separates diseased from healthy samples. Strong diagnostic performance would mean that measuring these genes, or the proteins and microRNAs they encode, could one day help identify Alzheimer’s earlier and more reliably than current cognitive assessments and imaging alone. With disease-modifying therapies finally emerging, the window for meaningful intervention depends critically on early detection, making reliable molecular biomarkers one of the field’s most valuable goals.

As with any computational study, caveats apply. The findings are hypotheses generated from correlation in a modest sample of 39 disease and 8 control brains, and hub genes identified by network centrality do not automatically equal causal drivers. The predicted drug interactions and docking results require validation in cell and animal models before any clinical translation. Nevertheless, the pipeline used here mirrors successful approaches in other diseases and provides a transparent, reproducible map of where future experimental effort should be directed.

Taken together, the work offers new insights into Alzheimer’s pathogenesis by nominating ten hub genes, two microRNAs, two transcription factors and several repurposable compounds as candidate diagnostic and therapeutic markers. It exemplifies a broader trend in biomedical research: as public sequencing archives grow, computational biology can extract biomedical value from data that already exists, at a fraction of the cost of new clinical trials. For a disease that affects tens of millions of people worldwide and still defies a cure, every new molecular lead, however preliminary, matters. The hub genes, microRNAs and transcription factors identified here now join the growing arsenal of targets that researchers worldwide will test in the years ahead.

“,”excerpt”:”A new bioinformatics study has mined brain sequencing data to identify ten hub genes, regulatory microRNAs and transcription factors, and repurposable drug candidates for Alzheimer’s disease.”,”subject”:”Bioinformatics identification of Alzheimer’s disease biomarkers and drug targets from next-generation sequencing data”,”tags”:[“Alzheimer’s disease”,”biomarkers”,”bioinformatics”,”next-generation sequencing”,”molecular docking”,”hub genes”,”HSP90AA1″,”FN1″,”drug repurposing”,”microRNA”,”transcription factors”,”dementia”]}`

The dataset at the heart of this study, GSE203206, is one of a growing number of publicly deposited transcriptomic datasets in the Gene Expression Omnibus, a repository maintained by the National Center for Biotechnology Information. Because such archives are openly accessible, any laboratory with computational resources can reanalyze raw sequencing reads, apply its own statistical thresholds, and cross-check published conclusions. This transparency has become a cornerstone of modern genomics, allowing independent teams to validate biomarker candidates across independent cohorts, a step that will be essential before any of the ten hub genes identified here can be considered a robust diagnostic marker.

Several of the hub genes carry biological stories that extend well beyond Alzheimer’s research. YAP1, for instance, is the key effector of the Hippo signaling pathway, a conserved cascade best known for controlling organ size and cell proliferation, and it has been increasingly implicated in neural regeneration and glial responses to injury. CDK7 is a cyclin-dependent kinase that functions as part of the transcriptional machinery, phosphorylating the RNA polymerase II tail and thereby regulating the expression of broad gene programs, which makes its dysregulation potentially consequential for many downstream pathways at once. LSM2 and SKP1 participate in RNA processing and ubiquitin-mediated protein degradation respectively, both processes that intersect with the protein homeostasis failures characteristic of neurodegenerative disease.

The involvement of HSP90AA1 is particularly interesting from a therapeutic standpoint. Heat shock protein 90 acts as a molecular chaperone that stabilizes numerous client proteins, many of which are involved in signaling cascades, and chaperone overload has been proposed as a mechanism by which misfolded and aggregated proteins, such as tau and amyloid-beta species, persist in the aging brain. Inhibitors of this chaperone have been explored in oncology for years, meaning that a substantial body of pharmacological knowledge and chemical tool compounds already exists and could be adapted for neurodegeneration research.

The microRNA findings also fit into a broader literature. MicroRNAs are short non-coding RNAs that each typically regulate dozens to hundreds of messenger RNAs, so a single microRNA shift can ripple across entire pathways. Previous work has documented widespread microRNA alterations in Alzheimer’s brain tissue and even in circulating blood, fueling interest in these molecules as minimally invasive biomarkers detectable in plasma or cerebrospinal fluid. The specific candidates reported here, hsa-mir-545-3p and hsa-miR-548f-5p, now join that expanding catalogue and can be tested for reproducibility in independent sample sets.

Molecular docking itself deserves a note of context. The method models how a small molecule fits into the three-dimensional structure of a target protein and estimates binding strength computationally, often within hours and at negligible cost compared with laboratory screening. Its predictions, however, are only as good as the protein structures and scoring functions used, and docking affinities frequently fail to translate into cellular activity. Natural products such as Isocryptomerin, derived from coniferous plants, and Macrophylloside D offer chemical diversity that synthetic libraries sometimes lack, which is why they attract attention as starting scaffolds. The sensible next steps are biochemical binding assays, neuronal cell models, and ultimately animal studies to determine whether any of these computational leads survives contact with biological reality.

Subject of Research: Identification of Candidate Biomarkers and Signaling Pathways Associated with Alzheimer’s Disease Using Bioinformatics Analysis of Next Generation Sequencing Data and Molecular Docking Studies

Article Title: Identification of Candidate Biomarkers and Signaling Pathways Associated with Alzheimer’s Disease Using Bioinformatics Analysis of Next Generation Sequencing Data and Molecular Docking Studies

Article References: Identification of Candidate Biomarkers and Signaling Pathways Associated with Alzheimer’s Disease Using Bioinformatics Analysis of Next Generation Sequencing Data and Molecular Docking Studies. (n.d.). https://doi.org/10.1007/s12126-026-09665-9

Image Credits: AI Generated

DOI: 10.1007/s12126-026-09665-9

Keywords: Identification, Candidate, Biomarkers, Signaling, Pathways, Associated, Alzheimer, Disease, Bioinformatics, Analysis, Next, Generation