About   Help   FAQ
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





Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB)), Gene Ontology (GO)
Citing These Resources
Funding Information
Warranty Disclaimer, Privacy Notice, Licensing, & Copyright
Send questions and comments to User Support.
last database update
11/12/2024
MGI 6.24
The Jackson Laboratory