Genome-wide association study reveals new insights into the heritability and genetic correlates of developmental dyslexia.
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Gialluisi Alessandro, Andlauer Till F M, Mirza-Schreiber Nazanin, Moll Kristina, Becker Jessica, Hoffmann Per, Ludwig Kerstin U, Czamara Darina, Pourcain Beate St, Honbolygó Ferenc, Tóth Dénes, Csépe Valéria, Huguet Guillaume, Chaix Yves, Iannuzzi Stephanie, Demonet Jean-Francois, Morris Andrew P, Hulslander Jacqueline, Willcutt Erik G, DeFries John C, Olson Richard K, Smith Shelley D, Pennington Bruce F, Vaessen Anniek, Maurer Urs, Lyytinen Heikki, Peyrard-Janvid Myriam, Leppänen Paavo H T, Brandeis Daniel, Bonte Milene, Stein John F, Talcott Joel B, Fauchereau Fabien, Wilcke Arndt, Kirsten Holger, Müller Bent, Francks Clyde, Bourgeron Thomas, Monaco Anthony P, Ramus Franck, Landerl Karin, Kere Juha, Scerri Thomas S, Paracchini Silvia, Fisher Simon E, Schumacher Johannes, Nöthen Markus M, Müller-Myhsok Bertram, Schulte-Körne Gerd
Аннотация
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 pT = 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.