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Genome-wide association study reveals new insights into the heritability and genetic correlates of developmental dyslexia


Abstract

Developmental dyslexia (DD) is a learning disorder affecting the ability to read, with a heritability of 40-60%. A notable part of this heritability remains unexplained, and large genetic studies are warranted to identify new susceptibility genes and clarify the genetic bases of dyslexia. We carried out a genome-wide association study (GWAS) on 2274 dyslexia cases and 6272 controls, testing associations at the single variant, gene, and pathway level, and estimating heritability using single-nucleotide polymorphism (SNP) data. We also calculated polygenic scores (PGSs) based on large-scale GWAS data for different neuropsychiatric disorders and cortical brain measures, educational attainment, and fluid intelligence, testing them for association with dyslexia status in our sample. We observed statistically significant (p  < 2.8 × 10$^{-6}$) enrichment of associations at the gene level, for LOC388780 (20p13; uncharacterized gene), and for VEPH1 (3q25), a gene implicated in brain development. We estimated an SNP-based heritability of 20-25% for DD, and observed significant associations of dyslexia risk with PGSs for attention deficit hyperactivity disorder (at p$_{T}$ = 0.05 in the training GWAS: OR = 1.23[1.16; 1.30] per standard deviation increase; p  = 8 × 10$^{-13}$), bipolar disorder (1.53[1.44; 1.63]; p = 1 × 10$^{-43}$), schizophrenia (1.36[1.28; 1.45]; p = 4 × 10$^{-22}$), psychiatric cross-disorder susceptibility (1.23[1.16; 1.30]; p = 3 × 10$^{-12}$), cortical thickness of the transverse temporal gyrus (0.90[0.86; 0.96]; p = 5 × 10$^{-4}$), educational attainment (0.86[0.82; 0.91]; p = 2 × 10$^{-7}$), and intelligence (0.72[0.68; 0.76]; p = 9 × 10$^{-29}$). This study suggests an important contribution of common genetic variants to dyslexia risk, and novel genomic overlaps with psychiatric conditions like bipolar disorder, schizophrenia, and cross-disorder susceptibility. Moreover, it revealed the presence of shared genetic foundations with a neural correlate previously implicated in dyslexia by neuroimaging evidence.

Abstract

Developmental dyslexia (DD) is a learning disorder affecting the ability to read, with a heritability of 40-60%. A notable part of this heritability remains unexplained, and large genetic studies are warranted to identify new susceptibility genes and clarify the genetic bases of dyslexia. We carried out a genome-wide association study (GWAS) on 2274 dyslexia cases and 6272 controls, testing associations at the single variant, gene, and pathway level, and estimating heritability using single-nucleotide polymorphism (SNP) data. We also calculated polygenic scores (PGSs) based on large-scale GWAS data for different neuropsychiatric disorders and cortical brain measures, educational attainment, and fluid intelligence, testing them for association with dyslexia status in our sample. We observed statistically significant (p  < 2.8 × 10$^{-6}$) enrichment of associations at the gene level, for LOC388780 (20p13; uncharacterized gene), and for VEPH1 (3q25), a gene implicated in brain development. We estimated an SNP-based heritability of 20-25% for DD, and observed significant associations of dyslexia risk with PGSs for attention deficit hyperactivity disorder (at p$_{T}$ = 0.05 in the training GWAS: OR = 1.23[1.16; 1.30] per standard deviation increase; p  = 8 × 10$^{-13}$), bipolar disorder (1.53[1.44; 1.63]; p = 1 × 10$^{-43}$), schizophrenia (1.36[1.28; 1.45]; p = 4 × 10$^{-22}$), psychiatric cross-disorder susceptibility (1.23[1.16; 1.30]; p = 3 × 10$^{-12}$), cortical thickness of the transverse temporal gyrus (0.90[0.86; 0.96]; p = 5 × 10$^{-4}$), educational attainment (0.86[0.82; 0.91]; p = 2 × 10$^{-7}$), and intelligence (0.72[0.68; 0.76]; p = 9 × 10$^{-29}$). This study suggests an important contribution of common genetic variants to dyslexia risk, and novel genomic overlaps with psychiatric conditions like bipolar disorder, schizophrenia, and cross-disorder susceptibility. Moreover, it revealed the presence of shared genetic foundations with a neural correlate previously implicated in dyslexia by neuroimaging evidence.

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Item Type:Journal Article, refereed, further contribution
Communities & Collections:04 Faculty of Medicine > Psychiatric University Hospital Zurich > Department of Child and Adolescent Psychiatry
04 Faculty of Medicine > Neuroscience Center Zurich
04 Faculty of Medicine > Center for Integrative Human Physiology
Dewey Decimal Classification:610 Medicine & health
Scopus Subject Areas:Life Sciences > Molecular Biology
Health Sciences > Psychiatry and Mental Health
Life Sciences > Cellular and Molecular Neuroscience
Language:English
Date:14 October 2020
Deposited On:16 Dec 2020 13:03
Last Modified:23 Dec 2020 03:17
Publisher:Nature Publishing Group
ISSN:1359-4184
OA Status:Hybrid
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1038/s41380-020-00898-x
PubMed ID:33057169

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