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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Barx2tm1Rsd
targeted mutation 1, Michael G Rosenfeld
MGI:3574438
Summary 3 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Barx2tm1Rsd/Barx2tm1Rsd involves: 129/Sv * C57BL/6 MGI:3574603
cx2
Barx2tm1Rsd/Barx2tm1Rsd
Dmdmdx/Y
involves: 129 * C57BL/6 * C57BL/10ScSn MGI:5439173
cx3
Barx2tm1Rsd/Barx2tm1Rsd
Dmdmdx/Dmdmdx
involves: 129 * C57BL/6 * C57BL/10ScSn MGI:5439179


Genotype
MGI:3574603
hm1
Allelic
Composition
Barx2tm1Rsd/Barx2tm1Rsd
Genetic
Background
involves: 129/Sv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Barx2tm1Rsd mutation (0 available); any Barx2 mutation (26 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Barx2tm1Rsd/Barx2tm1Rsd mice display open eyelids at birth, abnormal hair follicle remodeling and short whiskers and hair

pigmentation
• a delay in the anterior to posterior clearing of pigments that occurs during the hair cycle is seen

endocrine/exocrine glands
• seen during the final stages of the protracted catagen

vision/eye
• in about 50% of homozygotes

integument
• seen during the final stages of the protracted catagen
• mild alopecia is seen by 15-18 months of age
• hair length is initially normal but becomes significantly shorter (about 15-20% shorter compared to wild-type) by 6 months of age
• at about 2 weeks of age a transient disheveled appearance of the coat is seen (J:96883)
• the final stages of catagen are protracted and homozygotes do not reach telogen until P22-P23 compared to P19 in wild-type mice
• a delay in the anterior to posterior clearing of pigments that occurs during the hair cycle is seen

behavior/neurological
• waddling gait

growth/size/body
• mutants show a 10% reduction in body weight at P4 and a 20-25% reduction at 4 weeks of age, however no difference in body weight is seen at birth
• mutants show reduction in growth after birth, with growth delay most pronounced at around 4 weeks of age, when mutants are 20-25% smaller than heterozygotes or wild-type littermates
• however, mutants do not show any overt signs of feeding difficulties

muscle
• satellite-cell derived myoblasts from P4 muscles show altered morphology and reduced proliferation in culture; more myoblasts are rounded and show decreased spreading compared to wild-type cells
• analysis of differentiation markers indicates that satellite-cell derived myoblasts from P4 muscles show delayed differentiation
• myoblasts and myotubes exhibit poor adhesion to fibronectin
• 15-18 month old mutants show musculoskeletal abnormalities
• muscles contain fewer large myofibers and a greater number of smaller myofibers compared to controls
• soleus muscles exhibit narrower myofibers, more rounded myofibers, and an increased distance between myofibers compared to wild-type
• soleus and tibialis anterior muscles show narrower myofibers compared to wild-type
• tibialis anterior muscles show greater variability in myofiber size and shape relative to wild-type
• diaphragms of 6 month old mutants are thinner than in wild-type and this is associated with thinner myofibers
• limb muscle mass is reduced
• muscles are reduced in disproportion to overall body mass and the mass of other organs
• groups of angulated atrophic fibers are seen in soleus muscles
• tibialis anterior and quadriceps muscles from 4 week old mutants weigh 20-30% less than in controls
• soleus muscle is reduced by almost 60%
• mild fibrosis in the diaphragm at 6 months of age
• mutants intramuscularly injected with cardiotoxin to induce muscle injury show impaired muscle regeneration compared to wild-type, with necrosis still evident 10 days after injection

skeleton




Genotype
MGI:5439173
cx2
Allelic
Composition
Barx2tm1Rsd/Barx2tm1Rsd
Dmdmdx/Y
Genetic
Background
involves: 129 * C57BL/6 * C57BL/10ScSn
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Barx2tm1Rsd mutation (0 available); any Barx2 mutation (26 available)
Dmdmdx mutation (31 available); any Dmd mutation (154 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mutants are under-represented at weaning age

growth/size/body
• mutants are about 30% smaller than single Dmd mutants at 4 weeks of age; organs are reduced proportionately

behavior/neurological
• mutants become progressively less ambulatory with a waddling gait
• gait abnormalities appear earlier and are more severe than in single Barx2 mutants
• mutants become progressively less ambulatory

muscle
• organization of tibialis anterior muscle is extremely aberrant with greater variability in myofiber size and fewer central nuclei releative to muscle from single Dmd mutants
• soleus muscles show greater variability in myofiber size and shape compared to muscle from single Dmd mutants
• tibialis anterior muscle weighs on average 50% less than in single Dmd mutants, indicating muscle wasting
• at 12 months of age, diaphragms show a greater instance of focal myofiber necrosis and necrotic myofibers undergoing myophagocytosis and more fibrosis compared to single Dmd mutants
• diaphragm muscles at 6 months of age are much thinner than in single Dmd mutants and show more frequent rounded opaque fibers often with clear vacuoles, indicating hypercontracted atrophic fibers
• soleus muscles show more endomysial and perimysial fibrosis compared to muscle from single Dmd mutants
• diaphragms show more fibrosis than single Dmd mutants
• tibialis anterior muscle shows fewer central nuclei relative to muscle from single Dmd mutants, indicating reduction in repair of muscle damage
• mutants become progressively weak

skeleton
• mutants develop spine deformation resembling kyphosis by 6 months of age
• spine deformation appears earlier and is more severe than in single Barx2 mutants

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
Duchenne muscular dystrophy DOID:11723 OMIM:310200
J:187799




Genotype
MGI:5439179
cx3
Allelic
Composition
Barx2tm1Rsd/Barx2tm1Rsd
Dmdmdx/Dmdmdx
Genetic
Background
involves: 129 * C57BL/6 * C57BL/10ScSn
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Barx2tm1Rsd mutation (0 available); any Barx2 mutation (26 available)
Dmdmdx mutation (31 available); any Dmd mutation (154 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mutants are under-represented at weaning age

growth/size/body
• mutants are about 30% smaller than single Dmd mutants at 4 weeks of age; organs are reduced proportionately

behavior/neurological
• mutants become progressively less ambulatory with a waddling gait
• gait abnormalities appear earlier and are more severe than in single Barx2 mutants
• mutants become progressively less ambulatory

muscle
• organization of tibialis anterior muscle is extremely aberrant with greater variability in myofiber size and fewer central nuclei releative to muscle from single Dmd mutants
• soleus muscles show greater variability in myofiber size and shape compared to muscle from single Dmd mutants
• tibialis anterior muscle weighs on average 50% less than in single Dmd mutants, indicating muscle wasting
• at 12 months of age, diaphragms show a greater instance of focal myofiber necrosis and necrotic myofibers undergoing myophagocytosis and more fibrosis compared to single Dmd mutants
• diaphragm muscles at 6 months of age are much thinner than in single Dmd mutants and show more frequent rounded opaque fibers often with clear vacuoles, indicating hypercontracted atrophic fibers
• soleus muscles show more endomysial and perimysial fibrosis compared to muscle from single Dmd mutants
• diaphragms show more fibrosis than single Dmd mutants
• tibialis anterior muscle shows fewer central nuclei relative to muscle from single Dmd mutants, indicating reduction in repair of muscle damage
• mutants become progressively weak

skeleton
• mutants develop spine deformation resembling kyphosis by 6 months of age
• spine deformation appears earlier and is more severe than in single Barx2 mutants

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
Duchenne muscular dystrophy DOID:11723 OMIM:310200
J:187799





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last database update
12/10/2024
MGI 6.24
The Jackson Laboratory