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Cerebral Cortex Advance Access published online on August 13, 2009
Cerebral Cortex, doi:10.1093/cercor/bhp154
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© The Author 2009. Published by Oxford University Press. All rights reserved. For permissions, please e-mail: journals.permissions@oxfordjournals.org

The Effect of Variation in Expression of the Candidate Dyslexia Susceptibility Gene Homolog Kiaa0319 on Neuronal Migration and Dendritic Morphology in the Rat

Veronica J. Peschansky1, Timothy J. Burbridge1, Amy J. Volz1, Christopher Fiondella2, Zach Wissner-Gross3, Albert M. Galaburda1, Joseph J. Lo Turco2 and Glenn D. Rosen1

1 The Dyslexia Research Laboratory, Division of Behavioral Neurology, Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA, 2 Department of Physiology and Neurobiology, University of Connecticut, Storrs, CT 06268, USA, 3 Department of Physics, Harvard University, Cambridge, MA 02138, USA

Address correspondence to Glenn D. Rosen, PhD, Department of Neurology, E/CLS-643, Beth Israel Deaconess Medical Center, 330 Brookline Ave., Boston, MA 02215, USA. Email: grosen{at}bidmc.harvard.edu.

We investigated the postnatal effects of embryonic knockdown and overexpression of the candidate dyslexia gene homolog Kiaa0319. We used in utero electroporation to transfect cells in E15/16 rat neocortical ventricular zone with either 1) small hairpin RNA (shRNA) vectors targeting Kiaa0319, 2) a KIAA0319 expression construct, 3) Kiaa0319 shRNA along with KIAA0319 expression construct ("rescue"), or 4) a scrambled version of Kiaa0319 shRNA. Knockdown, but not overexpression, of Kiaa0319 resulted in periventricular heterotopias that contained large numbers of both transfected and non–transfected neurons. This suggested that Kiaa0319 shRNA disrupts neuronal migration by cell autonomous as well as non–cell autonomous mechanisms. Of the Kiaa0319 shRNA–transfected neurons that migrated into the cortical plate, most migrated to their appropriate lamina. In contrast, neurons transfected with the KIAA0319 expression vector attained laminar positions subjacent to their expected positions. Neurons transfected with Kiaa0319 shRNA exhibited apical, but not basal, dendrite hypertrophy, which was rescued by overexpression of KIAA0319. The results provide additional supportive evidence linking candidate dyslexia susceptibility genes to migrational disturbances during brain development, and extends the role of Kiaa0319 to include growth and differentiation of dendrites.

Key Words: cerebral cortex • dendritic hypertrophy • heterotopias • malformation • RNAi

Veronica J. Peschansky, Timothy J. Burbridge, and Amy J. Volz contributed equally to this manuscript.


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