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Blood Studies for Cardiovascular System I: Cardiac Biomarkers01:20

Blood Studies for Cardiovascular System I: Cardiac Biomarkers

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Cardiac biomarkers are enzymes, proteins, and hormones released into the blood when cardiac cells are injured. They are powerful tools for triaging.
The essential diagnostic tools for detecting myocardial necrosis and monitoring individuals suspected of having acute coronary syndrome (ACS) include:
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Troponins, particularly cardiac troponins I and T, are the most precise and sensitive markers of myocardial injury. They are detectable within 4-6 hours of myocardial injury and remain...
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Blood Studies for Cardiovascular System II: CRP, Hcy, and Cardiac Natriuretic Peptide Markers01:19

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Cardiac biomarkers are critical in diagnosing, prognosing, and managing cardiovascular diseases. Routine measurement of specific biomarkers such as B-type natriuretic peptide (BNP), C-reactive protein (CRP), and homocysteine (Hcy) is common practice in clinical settings to evaluate heart function and predict cardiovascular events.
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Dried Blood Spot Collection of Health Biomarkers to Maximize Participation in Population Studies
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Biomarkers.

Cecilia Boccalini1, Ines Hristovska2, Débora E Peretti3

  • 1University of Geneva, Geneva, Switzerland, Switzerland.

Alzheimer'S & Dementia : the Journal of the Alzheimer'S Association
|December 26, 2025
PubMed
Summary
This summary is machine-generated.

Alzheimer's disease (AD) protein deposition and neurodegeneration show distinct brain patterns. Differential gene expression explains these variations, linking amyloid accumulation to protein synthesis genes and tau pathology to synaptic function genes.

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Area of Science:

  • Neuroscience
  • Genetics
  • Medical Imaging

Background:

  • Alzheimer's disease (AD) is characterized by spatially and temporally distinct protein deposition (amyloid and tau) and neurodegeneration.
  • Understanding the molecular basis of regional variability in these AD pathologies is crucial for developing targeted therapies.

Purpose of the Study:

  • To investigate the biological and molecular properties underlying regional variations in amyloid, tau, and neurodegeneration phenotypes in Alzheimer's disease.
  • To correlate neuroimaging findings with gene expression patterns using imaging transcriptomics.

Main Methods:

  • Utilized imaging transcriptomics by combining PET/MRI data from AD patients and controls with regional gene expression data from the Allen Human Brain Atlas.
  • Employed hypothesis-driven analyses for gene-to-biomarker associations and data-driven over-representation analysis (ORA) and gene set enrichment analysis (GSEA) to identify molecular pathways.

Main Results:

  • Distinct regional patterns were observed for amyloid (frontal, parietal, lateral temporal), tau (medial temporal, lateral temporoparietal), and neurodegeneration (temporoparietal).
  • Amyloid load correlated with genes involved in protein synthesis, mitochondrial organization, RNA metabolism, immune regulation, and neuroinflammation.
  • Tau pathology and neurodegeneration severity were associated with genes related to synaptic organization, transmission, and function.

Conclusions:

  • Differential gene expression patterns explain the spatial and temporal decoupling of amyloid, tau, and neurodegeneration in Alzheimer's disease.
  • A subset of genes associated with amyloid accumulation confers additional vulnerability to downstream tau pathology.
  • Shared molecular mechanisms link upstream amyloid pathology to subsequent tau pathology and neuronal integrity loss.