Cited by 1,025Alzheimer's disease research and treatmentsDementia and Cognitive Impairment ResearchNeuroinflammation and Neurodegeneration Mechanisms

Incipient Alzheimer's disease: Microarray correlation analyses reveal major transcriptional and tumor suppressor responses

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Blalock, Eric M., Geddes, James W., Chen, Kuey Chu, Porter, Nada M., Markesbery, William R., Landfield, Philip W.·2004·Proceedings of the National Academy of Sciences

Abstract

The pathogenesis of incipient Alzheimer's disease (AD) has been resistant to analysis because of the complexity of AD and the overlap of its early-stage markers with normal aging. Gene microarrays provide new tools for addressing complexity because they allow overviews of the simultaneous activity of multiple cellular pathways. However, microarray data interpretation is often hindered by low statistical power, high false positives or false negatives, and by uncertain relevance to functional endpoints. Here, we analyzed hippocampal gene expression of nine control and 22 AD subjects of varying severity on 31 separate microarrays. We then tested the correlation of each gene's expression with MiniMental Status Examination (MMSE) and neurofibrillary tangle (NFT) scores across all 31 subjects regardless of diagnosis. These well powered tests revealed a major transcriptional response comprising thousands of genes significantly correlated with AD markers. Several hundred of these genes were also correlated with AD markers across only control and incipient AD subjects (MMSE > 20). Biological process categories associated with incipient AD-correlated genes were identified statistically ( ease program) and revealed up-regulation of many transcription factor/signaling genes regulating proliferation and differentiation, including tumor suppressors, oligodendrocyte growth factors, and protein kinase A modulators. In addition, up-regulation of adhesion, apoptosis, lipid metabolism, and initial inflammation processes occurred, and down-regulation of protein folding/metabolism/transport and some energy metabolism and signaling pathways took place. These findings suggest a new model of AD pathogenesis in which a genomically orchestrated up-regulation of tumor suppressor-mediated differentiation and involution processes induces the spread of pathology along myelinated axons.

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Crossref · 10.1073/pnas.0308512100

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  • Early transcriptomic studies utilizing microarrays revealed alterations in synaptic, immune, and metabolic pathways that appear even before clinical symptoms.

    “Early transcriptomic studies utilizing microarrays revealed alterations in synaptic, immune, and metabolic pathways that appear even before clinical symptoms, underscoring the potential for pre-symptomatic intervention120,125,161.”
  • Significant deviations (Welsh's P < 0.05) of 74 AD-related signatures from previous studies and GO pathways, including pathways related to Aβ, oxidative stress, tau NFT, and synaptic function, are observed across the five AD subtypes and controls.

    “As shown in Fig. 1E, we highlight significant deviations (Welsh’s P < 0.05) of 74 AD-related signatures from previous studies and GO pathways (17, 28), including pathways related to Aβ, oxidative stress, tau NFT, and synaptic function, across the five AD subtypes and controls.”
  • Intersection of the microglia signature gene list with 46 publicly available data sets for differentially regulated genes in neurodegenerative and behavioral disorders revealed significant enrichment or depletion of microglia signature genes in 28 of the 46 data sets.

    “We then intersected this gene list with 46 publicly available data sets for differentially regulated genes in neurodegenerative and behavioral disorders derived from microarray or RNA-seq analysis of intact tissue (39–53). Two-sided Fisher’s exact tests revealed significant enrichment or depletion of microglia signature genes in 28 of the 46 data sets (Table S3).”
  • The first large transcriptomic study (188 controls and 176 Alzheimer disease cases) connected genetic variation to expression changes using eQTL analysis and supported pathway-level findings related to transcriptional regulation and energy metabolism.

    “The first large transcriptomic study (involving 188 controls and 176 individuals with Alzheimer disease)147 connected genetic variation to expression changes by using expression quantitative trait locus analysis (eQTL analysis) in controls and Alzheimer disease, and further supported the pathway-level findings related to transcriptional regulation and energy metabolism in Alzheimer disease140,148.”
  • Large transcriptomic studies using quantitative severity metrics and differentially vulnerable regions identified pathway-level changes in transcriptional regulation, apoptosis, cell proliferation, energy metabolism, and synaptic transmission in Alzheimer disease.

    “Large studies using quantitative metrics of severity140 and differentially vulnerable regions144 have identified pathway-level changes in transcriptional regulation, apoptosis, cell proliferation, energy metabolism and synaptic transmission.”

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Authors
Blalock, E. M., Geddes, J. W., Chen, K. C., Porter, N. M., Markesbery, W. R., & Landfield, P. W.
Affiliations
University of Kentucky (US)
Venue
Proceedings of the National Academy of Sciences
Published
2004-02-09
Volume
101
Issue
7
Pages
2173-2178
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2114729479
Cited by
1,025
References
9
Citations by year
2026: 20 · 2025: 25 · 2024: 43 · 2023: 30 · 2022: 44 · 2021: 43 · 2020: 52 · 2019: 56 · 2018: 40 · 2017: 46 · 2016: 43 · 2015: 61 · 2014: 52 · 2013: 56 · 2012: 80
FWCI
27.41
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute on Aging (P50AG005144, AG-05144, P01AG010836, AG 10836)
Topics
  • Health Sciences › Medicine › Physiology › Alzheimer's disease research and treatments
  • Health Sciences › Medicine › Psychiatry and Mental health › Dementia and Cognitive Impairment Research
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
hippocampal gene expression, transcriptional response, tumor suppressor, neurofibrillary tangles, Mini-Mental State Examination, protein kinase A, apoptosis, inflammation, lipid metabolism, energy metabolism, Alzheimer's disease pathogenesis
MeSH terms
Algorithms, Alzheimer Disease, Female, Hippocampus, Humans, Male, Transcription Factors, Transcription, Genetic, Genes, Tumor Suppressor, Cyclic AMP-Dependent Protein Kinases, Disease Progression, Calcium Signaling, Oligonucleotide Array Sequence Analysis, Gene Expression Profiling

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