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Phenotypes Associated with This Genotype
Genotype
MGI:4450976
Allelic
Composition
Tg(Myh6-Tnf)1.6Amf/0
Genetic
Background
involves: FVB
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
cardiovascular system
• cross-sectional area is 2.6-fold larger than in wild-type mice
• at 6 to 9 months, the weight of the left atria is 3.6-fold greater than in wild-type mice
• mice exhibit increased heart to body weight compared with wild-type mice that is more severe in males and older mice
• mice exhibit atrial and ventricular hypertrophy compared with wild-type mice
• males (at 10 weeks) and females (at 10 and 30 weeks) exhibit increased collagen deposition compared with wild-type mice
• percent fractional area with collagen is 10- to 20-fold higher than in wild-type mice
• when stimulated with 1 Hz, total developed force and developed force normalized to cross-sectional area are 2.6-fold and 6.6-fold, respectively, compared to in similarly treated wild-type mice
• 6 Hz stimulation produces a 44% reduction of developed force with an increase in basal tension in the atria compared with 25% in similarly treated wild-type mice
• after 3 months, mice exhibit decreased heart rate compared with wild-type mice that is accentuated by lower heart rate in mice with chronic atrial fibrillation or flutter
• 9 of 13 mice exhibit premature atrial beats unlike wild-type mice
• mice exhibit atrial arrhythmias with premature atrial beats and runs of atrial fibrillation or flutter unlike wild-type mice
• male mice exhibit a higher frequency of spontaneous and inducible atrial arrhythmias and a higher frequency of spontaneous premature atrial beats than female mice unlike wild-type mice
• in 10 of 13 mice
• upon single premature atrial stimuli, hearts exhibit slow atrial conduction and reentrant atrial tachycardias unlike similarly treated wild-type heart
• however, lowering the extracellular calcium ion concentration eliminates inducible atrial arrhythmias
• older female mice exhibit with abnormal atrioventricular node (AVN) conduction with longer AVN Wenckebach periodicity and longer effective and functional refractory periods compared with wild-type mice
• the HV intervals are prolonged and more horizontal cardiac electrical axes compared to in wild-type mice
• male mice exhibit longer HV intervals than female mice unlike wild-type mice
• male mice exhibit longer QRS than female mice unlike wild-type mice
• mice exhibit prolonged QT intervals compared with wild-type mice
• young males exhibit prolonged PR intervals compared with wild-type mice
• male mice exhibit longer PR than female mice unlike wild-type mice
• myocytes exhibit altered intracellular calcium ion activity and decreased sarcoplasmic reticulum calcium ion content compared with wild-type mice

muscle
• when stimulated with 1 Hz, total developed force and developed force normalized to cross-sectional area are 2.6-fold and 6.6-fold, respectively, compared to in similarly treated wild-type mice
• 6 Hz stimulation produces a 44% reduction of developed force with an increase in basal tension in the atria compared with 25% in similarly treated wild-type mice

growth/size/body
• at 6 to 9 months, the weight of the left atria is 3.6-fold greater than in wild-type mice
• mice exhibit increased heart to body weight compared with wild-type mice that is more severe in males and older mice
• mice exhibit atrial and ventricular hypertrophy compared with wild-type mice

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
dilated cardiomyopathy DOID:12930 OMIM:PS115200
J:104759


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last database update
10/29/2024
MGI 6.24
The Jackson Laboratory