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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Ryr1em2Zor
endonuclease-mediated mutation 2, Francesco Zorzato
MGI:7339045
Summary 3 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Ryr1em2Zor/Ryr1em2Zor C57BL/6J-Ryr1em2Zor MGI:7626291
ht2
Ryr1em2Zor/Ryr1+ C57BL/6J-Ryr1em2Zor MGI:7626251
ht3
Ryr1em1Zor/Ryr1em2Zor C57BL/6J-Ryr1em1Zor Ryr1em2Zor MGI:7626241


Genotype
MGI:7626291
hm1
Allelic
Composition
Ryr1em2Zor/Ryr1em2Zor
Genetic
Background
C57BL/6J-Ryr1em2Zor
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ryr1em2Zor mutation (0 available); any Ryr1 mutation (214 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
muscle
• normal single electrical-pulse-induced mean force in extraocular muscle
• normal extraocular muscle length, weight and cross section

vision/eye
• normal visual acuity




Genotype
MGI:7626251
ht2
Allelic
Composition
Ryr1em2Zor/Ryr1+
Genetic
Background
C57BL/6J-Ryr1em2Zor
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ryr1em2Zor mutation (0 available); any Ryr1 mutation (214 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
muscle
• normal single electrical-pulse-induced mean force in extraocular muscle
• normal extraocular muscle length, weight and cross section

embryo
• normal embryonic development

vision/eye
• normal visual acuity

growth/size/body
• normal body weight and growth after birth




Genotype
MGI:7626241
ht3
Allelic
Composition
Ryr1em1Zor/Ryr1em2Zor
Genetic
Background
C57BL/6J-Ryr1em1Zor Ryr1em2Zor
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ryr1em1Zor mutation (0 available); any Ryr1 mutation (214 available)
Ryr1em2Zor mutation (0 available); any Ryr1 mutation (214 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
muscle
• less than 90% reduced single electrical-pulse-induced mean force
• longer half relaxation after activation by single action potential
• normal length, weight and cross section
• fewer calcium release units (CRUs) and mitochondria in extraocular muscle; greater percentage of dyads
• misalignment of Z-discs in 80% of extraocular muscle fibers
• swelling of terminal cisternae in EOM fibers
• cores of disorganized morphology in extensor digitorum longus (EDL) muscles
• mitochondria and calcium release units (CRUs) absent from some EDL muscle fiber cores
• fewer mitochondria in extensor digitorum longus (EDL) fibers; mitochondria absent from some fiber cores
• normal number of mitochondria in flexor digitorum brevis (FDB) and soleus fibers
• fewer calcium release units (CRUs) in extensor digitorum longus (EDL) fibers; greater percentage of dyads and CRUs absent from some EDL muscle fiber cores
• atrophy of fast fibers in extensor digitorum longus (EDL) muscle as indicated by reduction of minimal Ferets fiber diameter
• normal in soleus muscle
• 10% reduction in extensor digitorum longus (EDL) and soleus muscle weight
• 60% and 50% decrease of specific twitch peak force in extensor digitorum longus (EDL) and soleus muscles, respectively, after application of single action potential
• shorter time to peak and half relaxation time in extensor digitorum longus (EDL) and soleus muscles after application of single action potential
• 30% reduction in maximal specific tetanic force in extensor digitorum longus (EDL) and soleus muscles after application of 150 Hz train of action potentials

cellular
• fewer mitochondria in extensor digitorum longus (EDL) fibers; mitochondria absent from some fiber cores
• normal number of mitochondria in flexor digitorum brevis (FDB) and soleus fibers

behavior/neurological
• 40% decrease in voluntary activity (running distance) and lower median cruise speed on running wheel

growth/size/body
• 20% lower weight after weaning
• normal between birth and weaning

homeostasis/metabolism
• 50% reduction in peak Ca2+ transients induced by single action potential in extraocular muscle (J:291685)
• longer half relaxation time after activation by single action potential in extraocular muscle (J:291685)
• normal half time to peak and time to peak Ca2+ transients induced by single action potential in extraocular muscle (J:291685)
• 40-50% reduction in peak Ca2+ transients induced by single action potential in extensor digitorum longus (EDL), flexor digitorum brevis (FDB) and soleus muscle fibers (J:292405)
• 40-50% reduction in peak Ca2+ transients induced by 100 Hz action potential train in extensor digitorum longus (EDL) and flexor digitorum brevis (FDB) muscle fibers (J:292405)
• 13% reduction in peak Ca2+ transients induced by 100 Hz action potential train in soleus muscle fibers (J:292405)
• 15% faster rising phase of peak Ca2+ transients induced by single action potential in EDL muscle fibers (J:292405)
• longer half relaxation time in FDB and soleus muscle fibers activated by single action potential (J:292405)
• shorter half relaxation time in EDL muscle fibers activated by single action potential (J:292405)
• normal resting Ca2+ concentrations in extensor digitorum longus (EDL), flexor digitorum brevis (FDB) and soleus muscle fibers (J:292405)
• normal rising phase of peak Ca2+ transients induced by single action potential in FDB and soleus muscle fibers (J:292405)

embryo
N
• normal embryonic development

vision/eye
N
• normal visual acuity
• less than 90% reduced single electrical-pulse-induced mean force
• longer half relaxation after activation by single action potential
• normal length, weight and cross section

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
congenital myopathy 1B DOID:0080991 OMIM:255320
J:291685 , J:292405





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last database update
11/12/2024
MGI 6.24
The Jackson Laboratory