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Multiple Sclerosis Heritability Estimation on Sardinian Ascertained Extended Families Using Bayesian Liability

Andrea Nova1, Teresa Fazia1, Valeria Saddi2

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Summary

Environmental factors, not genetics, significantly influence multiple sclerosis (MS) risk in Sardinia. Early life exposures, particularly for those born after 1946, are key drivers of MS liability, suggesting a need for further environmental research.

Keywords:
BayesianSardiniaascertained familiesheritabilityliability threshold modelmultiple sclerosis

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Area of Science:

  • Genetics and Environmental Epidemiology
  • Complex Disease Etiology

Background:

  • Heritability studies are crucial for understanding complex disease variability.
  • Multiple sclerosis (MS) etiology involves genetic and environmental factors.

Purpose of the Study:

  • Estimate narrow-sense heritability (h²) of MS on a liability scale in a Sardinian population.
  • Investigate MS liability variability from shared environment, sex, and birth year.
  • Assess early environmental exposures as a proxy for birth year.

Main Methods:

  • Utilized extended families from Nuoro, Sardinia, ascertained from affected probands.
  • Implemented a Bayesian liability threshold model to adjust for ascertainment bias.
  • Analyzed sources of MS liability including genetics, environment, sex, and birth year.

Main Results:

  • Categorized birth year was the primary explanatory factor for MS liability (~70%).
  • Narrow-sense heritability (h²) for MS was near 0% (median 0.03).
  • A high h² (median 0.82) was observed only in individuals born on/after 1946.

Conclusions:

  • Early environmental exposures are a significant factor in MS etiology within the Sardinian population.
  • Genetic variability plays a substantial role in MS risk only for individuals born more recently (≥1946).
  • Further investigation into early environmental exposures is warranted for understanding MS.