Mouse Genome Informatics
cn
    Drd1tm2Jcd/Drd1+
Tg(Camk2a-cre)2Gsc/0

involves: 129S4/SvJae * FVB/N
Key:
phenotype observed in females WTSI Wellcome Trust Sanger Institute
phenotype observed in males EuPh Europhenome
N normal phenotype
       
nervous system
• after 4 weeks, approximately 12% smaller width of the entire brain compared to controls
• at 34 weeks brains weigh 15% less than wild-type
• striatal atrophy and secondary enlargement of the lateral ventricles are observed at 4 weeks in 1 mouse and in another 5 at 6 weeks
• striatal atrophy and secondary enlargement of the lateral ventricles are observed at 4 weeks in 1 mouse and in another 5 at 6 weeks
• dramatic reduction in striatal size in the second month
• striatal volume is decreased by 60% with a 65% loss in cell numbers and 17% reduction in cell density
• hippocampus volume is decreased
• decrease in dentate gyrus cell number
• cortex volume is significantly decreased without a change in cell density or total cell number
• cortical thickness is decreased at 4,6, 8 and 30 weeks
• astrocytes had a reactive astrocyte morphology with large cell bodies and complex ramified cellular processes
• the number of reactive astrocytes (GFAP+) increases over time with a 20-fold higher number of GFAP+ cells at 9 weeks, then reduces at later time points but always remains high than in controls
• reactive astrocytes are seen in the hippocampus and cortex
• at 5 weeks, handling-induced seizures occur
• spontaneous seizures were recorded in 2 of 5 mice
• activated microglia (CD11b+) are present in the cortex, hippocampus, thalamus and caudate putamen at 3 weeks but numbers decrease over time
• at 5 weeks less microglial reactivity is seen in the thalamus and no activated microglia are seen in the cortex or hippocampus
• at 21 weeks mice are free of microglia
• interictal electroencephalogram (EEG) is abnormal

behavior/neurological
• at 4 weeks, hindlimb clasping is subtle
• at 12 weeks, frequent paroxysmal bursts of dystonic hindlimb retraction are observed
• at 14 weeks, mice sustain hindlimb clasping with trunk flexion
• at 14 weeks trunk flexion associated with hindlimb clasping
• at 6 to 9 weeks and 16 to 21 weeks, there is a decrease in chewing and shifting while total rearing is increased
• at 12 weeks, frequent paroxysmal bursts of dystonic hindlimb retraction are observed
• at 6 to 9 weeks but not at 16 to 21 weeks, mice show increases in distance covered, time spent moving and speed of movement
• increase in sniffing
• at 5 weeks, handling-induced seizures occur
• spontaneous seizures were recorded in 2 of 5 mice

muscle
• at 12 weeks, frequent paroxysmal bursts of dystonic hindlimb retraction are observed

growth/size/body
• males and females weigh 17% and 25%, respectively, less than wild-type

immune system
• activated microglia (CD11b+) are present in the cortex, hippocampus, thalamus and caudate putamen at 3 weeks but numbers decrease over time
• at 5 weeks less microglial reactivity is seen in the thalamus and no activated microglia are seen in the cortex or hippocampus
• at 21 weeks mice are free of microglia

hematopoietic system
• activated microglia (CD11b+) are present in the cortex, hippocampus, thalamus and caudate putamen at 3 weeks but numbers decrease over time
• at 5 weeks less microglial reactivity is seen in the thalamus and no activated microglia are seen in the cortex or hippocampus
• at 21 weeks mice are free of microglia

Mouse Models of Human Disease
OMIM IDRef(s)
Huntington Disease; HD 143100 J:120070