Human Molecular Genetics Advance Access originally published online on February 23, 2006
Human Molecular Genetics 2006 15(7):1169-1179; doi:10.1093/hmg/ddl032
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A mouse model for Glut-1 haploinsufficiency
1Colleen Giblin Laboratories for Pediatric Neurology Research, Department of Neurology and 2Department of Psychiatry, Division of Biostatistics, New York State Psychiatric Institute, Columbia University, New York, NY, USA and 3Developmental Neurogenetics Laboratory, Department of Neurology, Baylor College of Medicine, Houston, TX, USA
* To whom correspondence should be addressed at: Columbia University, Neurological Institute, 710 West 168th Street, New York, NY 10032, USA. Tel: +1 2123055244; Fax: +1 2123057036; Email: dcd1{at}columbia.edu
Received December 12, 2005; Revised February 8, 2006; Accepted February 15, 2006
Glut-1 deficiency syndrome (Glut-1 DS, OMIM #606777) is characterized by infantile seizures, developmental delay, acquired microcephaly and hypoglycorrhachia. It is caused by haploinsufficiency of the bloodbrain barrier hexose carrier. Heterozygous mutations or hemizygosity of the GLUT-1 gene cause Glut-1 DS. We generated a heterozygous haploinsufficient mouse model by targeted disruption of the promoter and exon 1 regions of the mouse GLUT-1 gene. GLUT-1+/ mice have epileptiform discharges on electroencephalography (EEG), impaired motor activity, incoordination, hypoglycorrhachia, microencephaly, decreased brain glucose uptake as measured by positron emission tomography (PET) scan and decreased brain Glut-1 expression by western blot (66%). The GLUT-1+/ murine phenotype mimics the classical human presentation of Glut-1 DS. This GLUT-1+/ mouse model creates an opportunity to investigate Glut-1 function, to examine the pathophysiology of Glut-1 DS in vivo and to evaluate new treatment strategies.
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