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Area of Science:

  • Genomics
  • Molecular Biology
  • Human Genetics

Background:

  • Alternative splicing is common in mammals, but its variation within human populations remains largely uncharacterized.
  • Understanding splicing differences is crucial for interpreting genetic variation and its impact on human health.

Purpose of the Study:

  • To identify and characterize naturally variable exons (NVEs) in the human population.
  • To investigate the frequency, impact, and genetic regulation of NVEs.
  • To assess the implications of NVEs for human genetic analyses.

Main Methods:

  • Analysis of GTEx tissue transcriptomes from 838 individuals.
  • Identification of exons with variable inclusion across individuals.
  • Association analysis with genetic variants and gene expression levels.

Main Results:

  • Discovery of 57,271 NVEs affecting three-quarters of protein-coding genes.
  • NVEs are present across all population frequencies and often absent from reference annotations.
  • NVEs are linked to genetic variants, influencing gene expression and aiding in variant interpretation.

Conclusions:

  • Human populations exhibit abundant alternative splicing variation through NVEs.
  • NVEs have significant implications for understanding gene function and interpreting genetic variants.
  • Characterization of NVEs enhances the interpretation of human genetic analyses.