Phenotypes Associated with This Genotype

Genotype
MGI:6104247

• Allelic Composition: Ryr2^tm3.1Hhv/Ryr2⁺
• Genetic Background: involves: 129S7/SvEvBrd * C57BL/6

• ♀: phenotype observed in females
• ♂: phenotype observed in males
• N: normal phenotype

cardiovascular system

decreased heart rate ( J:220671 )

• bradycardia at baseline

• however, mice exhibit normal fractional shortening and ejection fraction and show no gross structural alterations of the heart

ventricular fibrillation ( J:220671 )

• increasing the extracellular calcium concentration from 1.8 to 3.6 mM during adrenergic stress induces spontaneous long-lasting ventricular fibrillation

• however, hearts stimulated with isoproterenol do not show spontaneous arrhythmias under basal conditions and hearts stimulated with isoproterenol and administered caffeine fail to induce arrhythmias

abnormal myocardial fiber physiology ( J:220671 )

• high variability in intracellular calcium transient decay in ventricular myocytes

• the maximum rise rate and amplitude of the evoked intracellular calcium transient are depressed in ventricular myocytes, resulting in a lower e-c coupling gain

• ventricular myocytes show random occurrence of early afterdepolarizations which appear as depolarized potentials and distort the action potential waveform

• intracellular calcium transients are altered, showing random occurrence of a sustained, low-amplitude phase of calcium release

• in isoproterenol-stimulated ventricular myocytes, peak of calcium release during systole is decreased, gradually overloading the sarcoplasmic reticulum with calcium

Mouse Models of Human Disease		DO ID	OMIM ID(s)	Ref(s)
catecholaminergic polymorphic ventricular tachycardia 1		DOID:0060675	OMIM:604772	J:220671