Strong genetic evidence of DCDC2 as a susceptibility gene for dyslexia

Johannes Schumacher*, Heidi Anthoni, Faten Dahdouh, Inke R. König, Axel M. Hillmer, Nadine Kluck, Malou Manthey, Ellen Plume, Andreas Warnke, Helmut Remschmidt, Jutta Hülsmann, Sven Cichon, Cecilia M. Lindgren, Peter Propping, Marco Zucchelli, Andreas Ziegler, Myriam Peyrard-Janvid, Gerd Schulte-Körne, Markus M. Nöthen, Juha Kere

*Corresponding author for this work
216 Citations (Scopus)

Abstract

We searched for linkage disequilibrium (LD) in 137 triads with dyslexia, using markers that span the most-replicated dyslexia susceptibility region on 6p21-p22, and found association between the disease and markers within the VMP/DCDC2/KAAG1 locus. Detailed refinement of the LD region, involving sequencing and genotyping of additional markers, showed significant association within DCDC2 in single-marker and haplotype analyses. The association appeared to be strongest in severely affected patients. In a second step, the study was extended to include an independent sample of 239 triads with dyslexia, in which the association-in particular, with the severe phenotype of dyslexia-was confirmed. Our expression data showed that DCDC2, which contains a doublecortin homology domain that is possibly involved in cortical neuron migration, is expressed in the fetal and adult CNS, which-together with the hypothesized protein function-is in accordance with findings in dyslexic patients with abnormal neuronal migration and maturation.

Original languageEnglish
JournalAmerican Journal of Human Genetics
Volume78
Issue number1
Pages (from-to)52-62
Number of pages11
ISSN0002-9297
DOIs
Publication statusPublished - 01.2006

Funding

We are grateful to all investigated individuals for their cooperation in this study. This study was supported by the Deutsche Forschungsgemeinschaft. P.P. was supported by the National Genomic Network of the Bundesministerium für Bildung und Forschung. M.M.N. received support for this work from the Alfried Krupp von Bohlen und Halbach-Stiftung. M.P.-J. is a recipient of a research position from the Swedish Research Council (Vetenskpsrådet). J.K. is supported by grants from the Swedish Research Council, the Academy of Finland, the Sigrid Jusélius Foundation, and the Päivikki and Sakari Sohlberg Foundation. Some of the results were obtained by using the program package S.A.G.E., which is supported by U.S. Public Health Service Resource grant RR03655 from the National Center for Research Resources.

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