Rs793862

Rs793862, a SNP in the DCDC2 gene, is in a region that crops up in several independent studies as likely to associated with dyslexia. The risk allele in the Caucasian populations studied is (A).

One study reports that the odds ratio for rs793862 genotypes increases if calculated from subsets of more severely dyslexic individuals as compared to more heterogenous, larger groups of dyslexic individuals. The genotype relative risk (GRR) for rs793862(A;A) increased from 3.15 (95% CI 1.30-7.66; P=.011) for the larger group up to 5.40 (95% CI 1.27-23.01; P=.002) for the most severely affected group.

Combined with another SNP marker in the DCDC2 gene, rs807701, the (haplotype) GRR also increased for the homozygous haplotype A-C, from 4.11 (95% CI 2.77-6.08; P<.0001) for the larger group, up to 11.13 (95% CI 6.32-19.60; P<.0001) for the most severely affected group.

This SNP was also reported to be significantly associated in a linkage study of dyslexic individuals.