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Related Experiment Videos

Phenotypic and genotypic correlation between myopia and intelligence.

Katie M Williams1,2, Pirro G Hysi2, Ekaterina Yonova-Doing2

  • 1Department of Ophthalmology, King's College London, 3rd Floor Block D South Wing, St Thomas' Hospital, Westminster Bridge Road, London, SE1 7EH, UK.

Scientific Reports
|April 7, 2017
PubMed
Summary
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Shared genetic factors link myopia (nearsightedness) and intelligence. This study found a significant genetic correlation between these heritable traits, suggesting common genetic influences contribute to both conditions.

Area of Science:

  • Ophthalmology
  • Genetics
  • Cognitive Science

Background:

  • Myopia (nearsightedness) is a common, globally increasing eye condition that can lead to visual impairment and sight-threatening complications.
  • Myopia is known to be associated with higher intelligence, and both traits are heritable.

Purpose of the Study:

  • To investigate the genetic correlation between myopia and intelligence in adolescents.
  • To determine the extent to which shared genetic factors influence both refractive error and cognitive ability.

Main Methods:

  • Phenotypic correlation analysis was performed on refractive error and intelligence in over 1,500 adolescent subjects.
  • Bivariate twin modeling was used to assess heritability and genetic correlation.
  • Polygenic risk scores were constructed using genome-wide association study data for myopia and intelligence.

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Main Results:

  • A significant negative phenotypic correlation (-0.116) was observed between refractive error and intelligence.
  • Both refractive error (85%) and intelligence (47%) were confirmed as heritable traits.
  • A significant genetic correlation (-0.143) was found, with 78% of the phenotypic correlation explained by genetic factors.
  • Polygenic scores for intelligence explained a small but significant portion of refractive error variance (0.99%), indicating genetic pleiotropy.

Conclusions:

  • Shared genetic factors significantly contribute to the covariance between myopia and intelligence.
  • These findings highlight the complex interplay between genetic influences on visual health and cognitive function.