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Phenotypes Associated with This Genotype
Genotype
MGI:3622299
Allelic
Composition
Tg(Myh6-Tmod1)65Msus/Tg(Myh6-Tmod1)65Msus
Genetic
Background
involves: FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
No mouse lines available in IMSR.
See publication links below for author information.
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mutants always die if overstressed with physical handling
• mutants with most severe phenotypes show cardiomyopathic changes between 2 and 4 weeks after birth and die within 2-3 days of exhibiting the phenotypes

cardiovascular system
• percentage of cell volume occupied by the nucleus in hearts is significantly greater, however do not exhibit an increase in nuclear number
• myofibrils are disorganized, show a loss of parallel alignment, are curved with distorted Z bands, and exhibit sarcomeric dysgenesis, with a 53% reduction in sarcomeric length
• actin and myosin filaments are found without discernible Z bands is some areas, whereas in other regions distinct closely spaced sarcomeres are seen
• myofibrils are absent from large areas of the cell and numerous mitochondria are present, consistent with degenerating cardiomyocytes
• the right ventricular myocardial wall is translucent, indicating a decrease in thickness and the left ventricular posterior wall is thinner
• ventricular wall shows karyomegalic nuclei
• thinning of ventricular septum
• extreme left ventricle dilation despite the thinned myocardium
• exhibit global dilation with marked right side atrial and ventricular enlargement, however do not exhibit cardiac hypertrophy
• 59% decrease in +dP/dt, indicating reduced contractility
• left ventricle exhibits decreased shortening fraction and velocity of circumferential fiber shortening
• 52% decrease in -dP/dt, indicating that relaxation is prolonged
• heart rate is 11% lower than controls
• some exhibit heart failure at 2-4 weeks of age

muscle
• myofibrils are disorganized, show a loss of parallel alignment, are curved with distorted Z bands, and exhibit sarcomeric dysgenesis, with a 53% reduction in sarcomeric length
• actin and myosin filaments are found without discernible Z bands is some areas, whereas in other regions distinct closely spaced sarcomeres are seen
• myofibrils are absent from large areas of the cell and numerous mitochondria are present, consistent with degenerating cardiomyocytes
• the right ventricular myocardial wall is translucent, indicating a decrease in thickness and the left ventricular posterior wall is thinner
• exhibit global dilation with marked right side atrial and ventricular enlargement, however do not exhibit cardiac hypertrophy
• 59% decrease in +dP/dt, indicating reduced contractility
• left ventricle exhibits decreased shortening fraction and velocity of circumferential fiber shortening
• 52% decrease in -dP/dt, indicating that relaxation is prolonged

vision/eye
• exhibit proptosis with unusually dark eyes

respiratory system
N
• normal lungs

homeostasis/metabolism
• thrombi are often present within the left atrium

growth/size/body

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
dilated cardiomyopathy DOID:12930 OMIM:PS115200
J:107823


Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
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last database update
03/19/2024
MGI 6.23
The Jackson Laboratory