title: Phenotypic heterogeneity in the stargazin allelic series.
abstract: The stargazer mutant mouse is characterized by its ataxic gait, head tossing, and absence seizures. The mutation was identified in the gamma 2 subunit gene of the high voltage-dependent calcium channel, Cacng2. Subsequently, two allelic variants of stargazer have arisen, waggler and stargazer 3J. In this study, we have compared these new alleles to the original stargazer allele. All three mutations affect the Cacng2 mRNA levels as they all arise from disruptions within the introns of this gene. Our results show that the mutations cause reduced Cacng2 mRNA and protein levels. Stargazer and waggler mice have the least amount of mRNA and undetectable protein, whereas stargazer 3J appears to be the mildest allele, both in terms of the phenotype and protein expression. Electroencephalographic (EEG) analysis confirmed that stargazer has frequent spike-wave discharges (SWDs); the average duration of each discharge burst is 5 seconds and recurs every minute. The waggler allele causes a greater variation in SWD activity depending on the individual mouse, and the stargazer 3J mouse has no SWDs. The preliminary characterization of this heterogeneous allelic series provides a basis to explore more biochemical and physiological parameters relating to the role of the Cacng2 product in calcium channel activity, AMPA receptor localization, and cerebellar disturbances.
authors.affiliation: The Jackson Laboratory, 600 Main Street, Bar Harbor, Maine 04609, USA. val@jax.org
authors.forename: Verity A
authors.initials: VA
authors.lastname: Letts
authors.forename: Myoung-Goo
authors.initials: MG
authors.lastname: Kang
authors.forename: Connie L
authors.initials: CL
authors.lastname: Mahaffey
authors.forename: Barbara
authors.initials: B
authors.lastname: Beyer
authors.forename: Heather
authors.initials: H
authors.lastname: Tenbrink
authors.forename: Kevin P
authors.initials: KP
authors.lastname: Campbell
authors.forename: Wayne N
authors.initials: WN
authors.lastname: Frankel
mesh_terms: D000200:Action Potentials / Q000235:genetics / Q000502:physiology; D000483:Alleles; D000818:Animals; D015153:Blotting, Western; D015220:Calcium Channels / Q000235:genetics* / Q000502:physiology*; D017931:DNA Primers; D004569:Electroencephalography; D051379:Mice; D008817:Mice, Mutant Strains; D010641:Phenotype; D012333:RNA, Messenger / Q000235:genetics / Q000502:physiology; D020133:Reverse Transcriptase Polymerase Chain Reaction
chemical_list: C113940:Cacng2 protein, mouse; D015220:Calcium Channels; D017931:DNA Primers; D012333:RNA, Messenger