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Related Concept Videos

MicroRNAs01:22

MicroRNAs

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MicroRNA (miRNA) are short, regulatory RNA transcribed from introns (non-coding regions of a gene) or intergenic regions (stretches of DNA present between genes). Several processing steps are required to form biologically active, mature miRNA. The initial transcript, called primary miRNA (pri-mRNA), base-pairs with itself, forming a stem-loop structure. Within the nucleus, an endonuclease enzyme, called Drosha, shortens the stem-loop structure into hairpin-shaped pre-miRNA. After the pre-miRNA...
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Brain microRNAs differentially expressed in age-related cerebral pathologies.

Tianze Luo1, Selina M Vattathil2, Adriana Lori3

  • 1Department of Neurology, Emory University, Atlanta, GA, USA.

Neurobiology of Aging
|April 14, 2025
PubMed
Summary

MicroRNAs (miRNAs) play a role in age-related brain diseases like Alzheimer's. This study identified specific miRNAs linked to various pathologies, offering insights into their biological underpinnings.

Keywords:
Age-related cerebral pathologyAlzheimer’s diseaseArteriolosclerosisBrain microRNACerebral amyloid angiopathyLATE-NCLewy body pathology

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Area of Science:

  • Neuroscience
  • Genetics
  • Aging Research

Background:

  • Age-related cerebral pathologies, including Alzheimer's disease (AD), Lewy body pathology, arteriolosclerosis, cerebral amyloid angiopathy, and Limbic-predominant Age-related TDP-43 Encephalopathy Neuropathological Change (LATE-NC), are common but their biological basis is not fully understood.
  • MicroRNAs (miRNAs) are small non-coding RNAs that regulate gene expression and are implicated in various biological processes, including aging and disease.

Purpose of the Study:

  • To investigate the association between specific microRNAs (miRNAs) and ten distinct age-related cerebral pathologies.
  • To identify miRNAs that are uniquely linked to individual pathologies or shared across multiple conditions.

Main Methods:

  • Analysis of miRNA sequencing profiles from the dorsolateral prefrontal cortex of 617 brain donors.
  • Statistical adjustment for age, sex, education, and co-existing cerebral pathologies to identify specific miRNA associations.
  • Gene set enrichment analysis to explore the functional relevance of identified miRNAs.

Main Results:

  • Identified specific miRNAs associated with Alzheimer's disease (AD) pathology (75 miRNAs), Lewy body pathology (45 miRNAs), arteriolosclerosis (3 miRNAs), cerebral amyloid angiopathy (1 miRNA), and LATE-NC (4 miRNAs) after adjusting for confounding factors.
  • Found shared miRNA associations between AD and Lewy body pathology (14 miRNAs), and between AD and cerebral amyloid angiopathy (1 miRNA).
  • Gene set enrichment analysis revealed that miRNAs linked to arteriolosclerosis target genes involved in crucial pathways such as glutathione metabolism, synaptic function, cellular transport, and innate immunity.

Conclusions:

  • MicroRNAs are significantly associated with multiple age-related cerebral pathologies.
  • Specific miRNA signatures may contribute to distinct or overlapping pathologies, providing potential biomarkers and therapeutic targets.
  • These findings establish a foundation for further mechanistic studies into the role of miRNAs in brain aging and neurodegeneration.