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Summary
This summary is machine-generated.

This study reveals sex-specific genetic regulation of cerebrospinal fluid (CSF) proteins, uncovering distinct patterns in males and females. These findings offer new insights into the biological basis of sex differences in neurodegenerative diseases like Alzheimer's and Parkinson's.

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Area of Science:

  • Neurogenetics
  • Proteomics
  • Sex-based biology

Background:

  • Sex differences are evident in Alzheimer's (AD) and Parkinson's (PD).
  • Genetic regulation of gene expression shows sex-specific patterns.
  • Sex-specific regulation of proteins, crucial drug targets, remains understudied.

Purpose of the Study:

  • To investigate sex-specific genetic regulation of the proteome in cerebrospinal fluid (CSF).
  • To identify sex-specific protein quantitative trait loci (pQTL) in CSF.
  • To explore the link between sex-specific pQTL and neurodegenerative diseases.

Main Methods:

  • Performed sex-stratified pQTL analysis on ~6000 proteins in ~1600 males and ~1700 females using TOPMED imputed autosomal variants.
  • Utilized cis and trans pQTL significance thresholds of p < 5x10^-8 and p < 3.45x10^-11, respectively.
  • Examined pQTL relevance to AD and PD through colocalization and protein-wise association studies (PWAS).

Main Results:

  • Identified 1,684 significant pQTLs for 1,488 proteins across 811 genetic loci.
  • Discovered 384 pQTLs (22.8%) unique to one sex (215 male-specific, 169 female-specific).
  • Found sex-specific regulation of proteins by AD/PD loci, including LRRK2 in males and APOE region proteins in both sexes, with some loci exclusive to one sex (e.g., ACE, TMEM106B).

Conclusions:

  • Uncovered distinct sex-specific genetic regulation of the CSF proteome through sex-stratified pQTL analysis.
  • Findings complement existing sex-aware eQTL data.
  • Provides insights into biological mechanisms underlying sex differences in neurodegeneration.