The effect of variation in expression of the candidate dyslexia susceptibility gene homolog Kiaa0319 on neuronal migration and dendritic morphology in the rat.
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.
Peschansky
Veronica J
VJ
The Dyslexia Research Laboratory, Division of Behavioral Neurology, Department of Neurology, Beth Israel Deaconess Medical Center, Boston, MA 02215, USA.
Burbridge
Timothy J
TJ
Volz
Amy J
AJ
Fiondella
Christopher
C
Wissner-Gross
Zach
Z
Galaburda
Albert M
AM
Lo Turco
Joseph J
JJ
Rosen
Glenn D
GD
D000704:Analysis of Variance; D000818:Animals; D001973:Bromodeoxyuridine / Q000378:metabolism; D002465:Cell Movement / Q000235:genetics / Q000502:physiology; D003712:Dendrites; D018274:Electroporation / Q000379:methods; D004622:Embryo, Mammalian; D005260:Female; D051858:Forkhead Transcription Factors / Q000378:metabolism; D015870:Gene Expression / Q000235:genetics / Q000502:physiology*; D018507:Gene Expression Regulation, Developmental / Q000502:physiology; D049452:Green Fluorescent Proteins / Q000235:genetics; D018398:Homeodomain Proteins / Q000378:metabolism; D006801:Humans; D055029:Inverted Repeat Sequences / Q000235:genetics; D009419:Nerve Tissue Proteins / Q000235:genetics*; D009474:Neurons / Q000166:cytology* / Q000502:physiology*; D009687:Nuclear Proteins / Q000378:metabolism; D011247:Pregnancy; D051381:Rats; D017208:Rats, Wistar; D012097:Repressor Proteins / Q000378:metabolism; D014157:Transcription Factors; D014162:Transfection / Q000379:methods; D005680:gamma-Aminobutyric Acid / Q000378:metabolism
C080632:CUX1 protein, human; D051858:Forkhead Transcription Factors; D018398:Homeodomain Proteins; C500377:KIAA0319 protein, human; D009419:Nerve Tissue Proteins; D009687:Nuclear Proteins; D012097:Repressor Proteins; D014157:Transcription Factors; C485184:enhanced green fluorescent protein; D049452:Green Fluorescent Proteins; D005680:gamma-Aminobutyric Acid; D001973:Bromodeoxyuridine
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