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Basic Science and Pathogenesis.

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This study identified novel Alzheimer's disease (AD) risk genes on the X chromosome, including sex-specific and APOE*4-stratified loci. Findings reveal new biological mechanisms and potential drug targets for AD, particularly for female-biased risk.

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Area of Science:

  • Genetics
  • Neuroscience
  • Genomics

Background:

  • Expanded the largest X-chromosome wide association study (XWAS) for Alzheimer's disease (AD).
  • Incorporated novel sex- and APOE*4-stratified analyses.
  • Evaluated X chromosome inactivation escape (eXCI) to identify female-biased AD risk genes.

Purpose of the Study:

  • To uncover novel AD risk genes and biological mechanisms.
  • To elucidate shared genetic signals across AD and related traits.
  • To investigate sex-specific and APOE*4-stratified genetic risk for AD.

Main Methods:

  • Conducted XWAS with random X chromosome inactivation (rXCI) and eXCI models.
  • Performed genetic colocalization of AD signals with 2852 AD-relevant traits.
  • Utilized quantitative trait locus (QTL) colocalization across 62 tissues for gene prioritization.

Main Results:

  • Identified additional AD loci, including a male-specific signal near GLUD2 impacting glutamate/glutamine metabolism.
  • Discovered 9 additional loci in APOE*4-stratified analyses, with 3 eXCI hits.
  • Uncovered 38 loci through pleiotropy colocalization, many novel and female-biased, including MOSPD2, PNMA3, and GABRE.
  • Confirmed gene prioritization for PNMA3 and 3 APOE-stratified loci, including ACLS4.

Conclusions:

  • Provided novel insights into X-linked genetic risk for AD, considering APOE*4 and sex-specific effects.
  • Identified numerous novel risk loci, including 29 female-biased loci, potentially explaining sex disparities in AD.
  • Aimed to aid in elucidating AD pathways and identifying drug targets for personalized medicine.