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Genome-wide association studies or GWAS are used to identify whether common SNPs are associated with certain diseases. Suppose specific SNPs are more frequently observed in individuals with a particular disease than those without the disease. In that case, those SNPs are said to be associated with the disease. Chi-square analysis is performed to check the probability of the allele likely to be associated with the disease.
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Alzheimer's Disease (AD) is a continually advancing neurodegenerative disorder, distinguished by escalating memory loss, cognitive dysfunction, and dementia. The disease unfolds in three stages: preclinical, mild cognitive impairment (MCI), and dementia. Its onset is insidious, and the progression gradual, with the cause not well explained by other disorders.
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Alzheimer's Disease (AD), a neurodegenerative disorder, is pathologically identified by amyloid plaques and neurofibrillary tangles composed of tau protein. AD pharmacotherapy aims to manage cognitive symptoms, delay disease progression, and treat behavioral symptoms. The treatment is primarily symptomatic and palliative, with no definitive disease-modifying therapy available. Cholinesterase inhibitors, including donepezil (Aricept), rivastigmine (Exelon), and galantamine (Razadyne), are...
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Related Experiment Video

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Mapping Alzheimer's Disease Variants to Their Target Genes Using Computational Analysis of Chromatin Configuration
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X-chromosome-wide association study for Alzheimer's disease.

Julie Le Borgne1, Lissette Gomez2, Sami Heikkinen3

  • 1Univ. Lille, Inserm, CHU Lille, Institut Pasteur de Lille, LabEx DISTALZ - U1167-RID-AGE Facteurs de Risque et Déterminants Moléculaires des Maladies Liées au Vieillissement, Lille, France.

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Summary

This study investigated Alzheimer's Disease (AD) genetics on the X-chromosome, analyzing over 700,000 individuals. While no genome-wide significant associations were found, seven suggestive loci were identified, requiring further research into X-chromosome inactivation states.

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Area of Science:

  • Genetics
  • Neuroscience
  • Genomics

Background:

  • Genome-wide association studies (GWAS) have largely excluded the X-chromosome due to methodological challenges.
  • Understanding the X-chromosome's role in Alzheimer's Disease (AD) is crucial for a comprehensive genetic landscape.
  • Previous research has not fully characterized AD genetic risk factors on the X-chromosome.

Purpose of the Study:

  • To conduct an in-depth X-Chromosome-Wide Association Study (XWAS) for Alzheimer's Disease.
  • To investigate the genetic architecture of AD across the X-chromosome, considering various X-chromosome inactivation (XCI) states.
  • To identify novel genetic loci associated with AD risk on the X-chromosome.

Main Methods:

  • Performed a large-scale XWAS including over 115,000 AD cases and 613,000 controls.
  • Accounted for three XCI states: random, skewed, and escape.
  • Utilized stringent significance thresholds for genome-wide (P ≤ 5 × 10⁻⁸) and X-chromosome-wide (P ≤ 1.6 × 10⁻⁶) analyses.

Main Results:

  • No genome-wide significant signals for AD were detected on the X-chromosome.
  • Identified seven X-chromosome-wide significant loci, with index variants being common or rare.
  • Specific loci identified include Xp22.32, FRMPD4, DMD, Xq25, WNK3, PJA1, and DACH2.

Conclusions:

  • The X-chromosome does not harbor major genetic risk factors for AD in the non-pseudoautosomal region.
  • Suggestive signals identified warrant further investigation to confirm their role in AD pathogenesis.
  • This study highlights the importance of including the X-chromosome in future large-scale genetic studies of complex diseases.