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PMID: 15717286 Published · ppublish English Journal Article Research Support, Non-U.S. Gov't

Strong evidence that KIAA0319 on chromosome 6p is a susceptibility gene for developmental dyslexia.

American journal of human genetics ·Vol. 76 ·No. 4 ·2005-04-00 ·Pages 581-91

Cope N, Harold D, Hill G, Moskvina V, Stevenson J, Holmans P, Owen MJ, O'Donovan MC, Williams J

Abstract

Linkage between developmental dyslexia (DD) and chromosome 6p has been replicated in a number of independent samples. Recent attempts to identify the gene responsible for the linkage have produced inconsistent evidence for association of DD with a number of genes in a 575-kb region of chromosome 6p22.2, including VMP, DCDC2, KIAA0319, TTRAP, and THEM2. We aimed to identify the specific gene or genes involved by performing a systematic, high-density (approximately 2-3-kb intervals) linkage disequilibrium screen of these genes in an independent sample, incorporating family-based and case-control designs in which dyslexia was defined as an extreme representation of reading disability. Using DNA pooling, we first observed evidence for association with 17 single-nucleotide polymorphisms (SNPs), 13 of which were located in the KIAA0319 gene (P<.01-.003). After redundant SNPs were excluded, 10 SNPs were individually genotyped in 223 subjects with DD and 273 controls. Those SNPs that were significant at P</=.05 were next genotyped in a semi-independent sample of 143 trios of probands with DD and their parents, to control for possible population stratification. Six SNPs showed significant evidence of association in both samples (P</=.04-.002), including a SNP (rs4504469) in exon 4 of the KIAA0319 gene that changes an amino acid (P=.002; odds ratio 1.5). Logistic regression analysis showed that two SNPs (rs4504469 and rs6935076) in the KIAA0319 gene best explained DD status. The haplotype composed of these two markers was significantly associated with DD (global P=.00001 in the case-control sample; P=.02 in trios). This finding was largely driven by underrepresentation of the most common haplotype in cases (P=.00003 in the case-control sample; P=.006 in trios; 1-degree-of-freedom tests). Our data strongly implicate KIAA0319 as a susceptibility gene for dyslexia. The gene product is expressed in brain, but its specific function is currently unknown.

MeSH Terms
Adolescent Chromosome Mapping Chromosomes, Human, Pair 6 Dyslexia/genetics Genetic Predisposition to Disease Haplotypes Humans Linkage Disequilibrium Nerve Tissue Proteins/genetics Polymorphism, Single Nucleotide
Chemicals
KIAA0319 protein, human Nerve Tissue Proteins
Authors & Affiliations
9 authors, click to expand affiliations / ORCID
Cope Natalie
Department of Psychological Medicine, Wales College of Medicine, Cardiff University, Cardiff, United Kingdom.
Harold Denise
Hill Gary
Moskvina Valentina
Stevenson Jim
Holmans Peter
Owen Michael J
O'Donovan Michael C
Williams Julie
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Article Info
Journal
American journal of human genetics
Abbr.
Am J Hum Genet
ISSN
0002-9297
Published
2005-04-00
Epub
2005-00-16
Pages
581-91
Language
English
Region
United States
NLM ID
0370475
PMCID
PMC1199296
Subset
IM
Corrections
ErratumIn
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