A sequence variant associating with educational attainment also affects childhood cognition

Area of Science:

• Behavioral Genetics
• Neuroscience
• Human Cognition

Background:

• Few common genomic variants are known to affect cognitive traits.
• Educational attainment is a complex phenotype influenced by genetic and environmental factors.
• Recent studies identified three sequence variants associated with educational attainment.

Purpose of the Study:

• To investigate the association between a specific sequence variant (rs4851266-T) and childhood cognitive traits, specifically Verbal IQ.
• To determine if this variant's effect on cognition is independent of later educational attainment.
• To assess the variant's impact on verbal IQ in children with dyslexia.

Main Methods:

• Genomic sequencing analysis to identify variants associated with educational attainment.
• Statistical association tests (p-values, beta coefficients) to evaluate the link between rs4851266-T and Verbal IQ in dyslexic children and independent adult samples.
• Variance analysis to compare the proportion of variance explained in verbal IQ versus educational attainment.

Main Results:

• The rs4851266-T variant significantly associates with increased Verbal IQ in dyslexic children (P = 4.3 × 10⁻⁴, β = 0.16 s.d.).
• This association was replicated in independent adult samples, with a combined P-value of 2.2 × 10⁻⁷ (β = 0.14 s.d.).
• The variant explains a larger fraction of variance in verbal IQ (0.7%) compared to educational attainment (0.12%, P = 1.0 × 10⁻⁵).

Conclusions:

• The rs4851266-T genomic variant is a significant predictor of verbal IQ in childhood, independent of educational attainment.
• This finding highlights a specific genetic influence on early cognitive abilities, particularly relevant for individuals with dyslexia.
• The study underscores the complex interplay between genetics, early cognition, and educational outcomes.