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Related Experiment Video

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Alzheimer's Imaging Consortium.

Merve Atik1, Joseph S Reddy2, Thuy T Nguyen2

  • 1Mayo Clinic Graduate School of Biomedical Sciences, Florida, FL, USA.

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Summary
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This study expands genome-wide association studies to investigate genetic factors influencing cerebral amyloid angiopathy (CAA). Findings highlight the LINC-PINT variant

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Area of Science:

  • Neurogenetics
  • Neuropathology
  • Alzheimer's Disease research

Background:

  • Cerebral amyloid angiopathy (CAA) involves amyloid-beta accumulation in brain vasculature, compromising vessel integrity and exacerbating cognitive decline in Alzheimer's Disease (AD).
  • A prior genome-wide association study (GWAS) linked a LINC-PINT splice variant to reduced CAA levels in non-APOEe4 carriers and increased LINC-PINT expression in AD brains.
  • This research expands the GWAS to a larger cohort, including AD and non-AD donors with varying neuropathology and CAA scores.

Purpose of the Study:

  • To identify genetic variants associated with cerebral amyloid angiopathy (CAA) through an expanded genome-wide association study (GWAS).
  • To investigate the role of the LINC-PINT splice variant in CAA, particularly in relation to APOEe4 allele presence and AD.
  • To explore the genetic architecture of CAA in both AD and non-AD individuals.

Main Methods:

  • Expanded GWAS incorporating genetic data from 550 AD and 502 non-AD donors from the Mayo Clinic Brain Bank, alongside existing data.
  • Quality control and imputation (TOPMED) of all genetic datasets.
  • Linear regression analysis of imputed variant dosages against square root transformed CAA scores in AD, non-AD, and combined cohorts, adjusting for covariates and performing interaction/stratified analyses with APOEe4 and sex.

Main Results:

  • APOE locus variants emerged as the most significant genetic associations with CAA.
  • Several other variants approached genome-wide significance after accounting for AD neuropathology (Braak stage, Thal phase).
  • The LINC-PINT splice variant maintained its association with lower CAA scores in AD donors lacking the APOEe4 allele.

Conclusions:

  • The study provides further insights into the genetic underpinnings of CAA risk, relevant to both AD and non-AD contexts.
  • Continued research aims to validate findings in larger cohorts and explore functional consequences of identified variants.
  • Characterizing genetic variants and their functional impacts may pave the way for novel biomarkers and therapeutic strategies for CAA.