Phenotypes Associated with This Genotype

Genotype
MGI:5474009

• Allelic Composition: Cacna1s^tm1.1Cann/Cacna1s^tm1.1Cann
• Genetic Background: involves: 129

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

Vacuolar myopathy in Cacna1s^tm1.1Cann/Cacna1s^tm1.1Cann muscle and rare dilated cisternae in Cacna1s^tm1.1Cann/Cacna1s⁺ sarcoplasmic reticulum

muscle

dilated sarcoplasmic reticulum ( J:193967 )

• massive dilation of the transverse tubules and cisternae of the sarcoplasmic reticulum

centrally nucleated skeletal muscle fibers ( J:193967 )

• in the gastrocnemius at 4 months and the tibialis anterior at 9 months

abnormal muscle physiology ( J:193967 )

• calcium transients elicited by filed stimulation of dissociated flexor digitorum brevis fibers are reduced compared to in wild-type mice

• mice exhibit in vivo hypokalemic periodic paralysis from glucose plus insulin challenge with reduced relative CAMP and force compared with wild-type mice

• fibers exhibit reduced excitability caused by depolarization of the resting potential compared with wild-type fibers

• flexor digitorum brevis fibers exhibit loss of function changes for ionic current conduction compared with wild-type fibers

• the amplitude of calcium ion transient under voltage clamp conditions is 3-fold smaller than in wild-type fibers

abnormal muscle contractility ( J:193967 )

• reduced extensor digitorum longus muscle peak force in male and female mice

• following low potassium challenge, extensor digitorum longus muscles in mice exhibit reduced peak force and a rapid decline in force with incomplete recovery after return to higher potassium levels compared with wild-type mice

• however, mice do not have myotonia

myopathy ( J:193967 )

• vacuolar myopathy with scattered central nuclei in the gastrocnemius at 4 months and the tibialis anterior at 9 months

Mouse Models of Human Disease		DO ID	OMIM ID(s)	Ref(s)
hypokalemic periodic paralysis		DOID:14452	OMIM:170400 OMIM:613345	J:19367