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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Nebm1Anu
mutation 1, Australian National University
MGI:6404213
Summary 1 genotype
Jump to Allelic Composition Genetic Background Genotype ID
ht1
Nebm1Anu/Nebm2Anu C57BL/6J-Nebm1Anu Nebm2Anu MGI:6404227


Genotype
MGI:6404227
ht1
Allelic
Composition
Nebm1Anu/Nebm2Anu
Genetic
Background
C57BL/6J-Nebm1Anu Nebm2Anu
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Nebm1Anu mutation (0 available); any Neb mutation (401 available)
Nebm2Anu mutation (0 available); any Neb mutation (401 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
muscle
• gastrocnemius and quadriceps muscles show abundant accumulations resembling nemaline bodies, with less abundance in the masseter, extensor digitorum longus and diaphragm, and none in soleus or tibialis anterior muscles
• aggregates are predominately found in MHC type IIB (fast, glycolytic) fibers
• nemaline bodies are large and irregular
• males show tubular aggregates in skeletal muscles at 9 months of age comparable to those seen in wild-type males at 18 months of age
• core-like structures are present in the oxidative fibers of tibialis anterior and masseter muscles, and occasionally in the quadriceps; core-like structures do not correspond to areas of nemaline body aggregation and are only present in a subset of fibers
• split myofibers are seen in the quadriceps and extensor digitorum longus
• large intermyofibrillar aggregates of mitochondria are seen in a subpopulation of myofibers of skeletal muscles, with variation in mitochondrial size within the aggregates
• all myofibers containing fast MHC (type IIA, IIB, IIA, and/or IIX) fibers are smaller in the EDL
• all myofibers form the soleus muscle are smaller
• myofiber size variation is seen in the quadriceps
• in EDL and soleus, the oxidative fiber types (slow MHC I or fast IIA) are more abundant, while there are fewer fast twitch, glycolytic type II fibers
• tibials anterior muscle myofibers show a 22% lower mean maximum specific force, a 28% slower mean rate of force redevelopment, and an unaffected maximum unloaded shortening velocity and normal thin filament length
• twitch contraction times are faster in the extensor digitorum longus (EDL) muscles, however no difference in soleus muscle twitch contraction times is seen
• EDL and soleus muscles show a decrease in normalized force at low stimulation frequencies
• the EDL is more susceptible to eccentric contraction-induced muscle damage than wild-type controls when stretched from 120 to 140% of optimal muscle length during eccentric activation
• EDL muscles are stiffer, with EDL transient stretch response 20% greater than in wild-type mice response during 140% of optimal muscle length stretch
• soleus muscle show a 15% decrease in stiffness during 140% of optimal muscle length stretch

behavior/neurological
• 6 month old females, but not males, show a deficit in muscle force in the grip strength test
• females show decreased performance in daily distance, average speed, and maximum speed at 6 months, but not 3 months, in voluntary running wheels

growth/size/body
• females are smaller than controls at 6 months of age

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
nemaline myopathy 2 DOID:0110928 OMIM:256030
J:285564





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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
10/29/2024
MGI 6.24
The Jackson Laboratory