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Transient neuromotor phenotype in transgenic spastic mice expressing low levels of glycine receptor beta-subunit: an animal model of startle disease

  • Startle disease or hereditary hyperekplexia has been shown to result from mutations in the alpha1-subunit gene of the inhibitory glycine receptor (GlyR). In hyperekplexia patients, neuromotor symptoms generally become apparent at birth, improve with age, and often disappear in adulthood. Loss-of-function mutations of GlyR alpha or beta-subunits in mice show rather severe neuromotor phenotypes. Here, we generated mutant mice with a transient neuromotor deficiency by introducing a GlyR beta transgene into the spastic mouse (spa/spa), a recessive mutant carrying a transposon insertion within the GlyR beta-subunit gene. In spa/spa TG456 mice, one of three strains generated with this construct, which expressed very low levels of GlyR beta transgene-dependent mRNA and protein, the spastic phenotype was found to depend upon the transgene copy number. Notably, mice carrying two copies of the transgene showed an age-dependent sensitivity to tremor induction, which peaked at approximately 3-4 weeks postnatally. This closely resembles the development of symptoms in human hyperekplexia patients, where motor coordination significantly improves after adolescence. The spa/spa TG456 line thus may serve as an animal model of human startle disease.

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Metadaten
Document Type:Article
Language:English
Parent Title (English):Eur J Neurosci. (European Journal of Neuroscience)
Volume:12
Issue:1
First Page:27
Last Page:32
ISSN:0953-816X
DOI:https://doi.org/10.1046/j.1460-9568.2000.00877.x
Pubmed Id:http://www.ncbi.nlm.nih.gov/pubmed?term=10651857
Publisher:Blackwell
Publication year:2000
Departments, institutes and facilities:Institut für funktionale Gen-Analytik (IfGA)
Dewey Decimal Classification (DDC):500 Naturwissenschaften und Mathematik / 570 Biowissenschaften; Biologie / 570 Biowissenschaften; Biologie
Entry in this database:2018/09/21