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Parental origin of genetic variants influences disease risk. This study found parent-specific associations for SNPs linked to breast cancer, basal-cell carcinoma, and type 2 diabetes in Icelanders.

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Area of Science:

  • Genetics
  • Genomics
  • Epigenetics

Background:

  • Genome-wide association studies (GWAS) have identified numerous sequence variants linked to human traits.
  • The influence of parental origin on the effects of these variants has been largely overlooked.
  • Understanding parental inheritance patterns is crucial for a comprehensive genetic analysis.

Purpose of the Study:

  • To investigate the impact of parental origin on single nucleotide polymorphism (SNP) associations with diseases.
  • To identify parent-specific genetic associations within imprinted gene regions.
  • To explore novel SNP associations and their epigenetic modifications.

Main Methods:

  • Utilized genealogy and long-range phasing to determine parental allele origin in 38,167 genotyped Icelanders.
  • Focused on SNPs within 500 kilobases of imprinted genes and known disease associations.
  • Examined seven independent SNP associations, including those for breast cancer, basal-cell carcinoma, and type 2 diabetes.

Main Results:

  • Identified parental-origin-specific associations for five out of seven examined SNPs.
  • These parent-specific associations were concentrated in two genomic regions (11p15 and 7q32) known for imprinted genes.
  • Discovered a novel association between SNP rs2334499 (11p15) and type 2 diabetes, with opposing effects based on paternal or maternal inheritance.
  • Found a differentially methylated CTCF-binding site at 11p15 correlated with rs2334499 and altered methylation patterns.

Conclusions:

  • Parental origin significantly influences the disease-associated effects of certain genetic variants.
  • Imprinted gene regions are key locations for parent-specific genetic effects.
  • The findings highlight the importance of considering parental inheritance in genetic association studies and disease risk assessment.