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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Mef2ctm2Eno
targeted mutation 2, Eric N Olson
MGI:3718323
Summary 7 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
cn1
Ighg1tm1(cre)Cgn/0
Mef2ctm2Eno/Mef2ctm2Eno
involves: 129P2/OlaHsd * 129S/SvEv * C57BL/6 MGI:6401159
cn2
Ighg1tm1(cre)Cgn/0
Mef2btm1.1Rdf/Mef2btm1.1Rdf
Mef2ctm2Eno/Mef2ctm2Eno
involves: 129P2/OlaHsd * 129S/SvEv * C57BL/6 MGI:6401163
cn3
Mef2ctm1Eno/Mef2ctm2Eno
Tg(Myog-cre)1Eno/0
involves: 129S/SvEv * 129S7/SvEvBrd MGI:4418148
cn4
Mef2ctm1Eno/Mef2ctm2Eno
Twist2tm1(cre)Dor/Twist2+
involves: 129S/SvEv * 129S7/SvEvBrd * 129X1/SvJ MGI:3719010
cn5
Mef2ctm1Eno/Mef2ctm2Eno
Tg(Col2a1-cre)1Bhr/0
involves: 129S/SvEv * 129S7/SvEvBrd * C57BL/6 * SJL MGI:3719016
cn6
Mef2atm1.1Limm/Mef2atm1.1Limm
Mef2ctm2Eno/Mef2ctm2Eno
Mef2dtm3Eno/Mef2dtm3Eno
Tg(GFAP-cre)25Mes/0
involves: 129S/SvEv * C57BL/6 * FVB/N MGI:5560657
cn7
Mef2ctm2Eno/Mef2ctm2Eno
Mef2dtm1Eno/Mef2dtm1Eno
Tg(Col2a1-cre)1Bhr/0
involves: 129S/SvEv * C57BL/6 * SJL MGI:3719017


Genotype
MGI:6401159
cn1
Allelic
Composition
Ighg1tm1(cre)Cgn/0
Mef2ctm2Eno/Mef2ctm2Eno
Genetic
Background
involves: 129P2/OlaHsd * 129S/SvEv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ighg1tm1(cre)Cgn mutation (3 available); any Ighg1 mutation (28 available)
Mef2ctm2Eno mutation (0 available); any Mef2c mutation (34 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• 14 days after immunization with sheep red blood cells (SRBCs)

immune system
• 14 days after immunization with sheep red blood cells (SRBCs)




Genotype
MGI:6401163
cn2
Allelic
Composition
Ighg1tm1(cre)Cgn/0
Mef2btm1.1Rdf/Mef2btm1.1Rdf
Mef2ctm2Eno/Mef2ctm2Eno
Genetic
Background
involves: 129P2/OlaHsd * 129S/SvEv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ighg1tm1(cre)Cgn mutation (3 available); any Ighg1 mutation (28 available)
Mef2btm1.1Rdf mutation (0 available); any Mef2b mutation (22 available)
Mef2ctm2Eno mutation (0 available); any Mef2c mutation (34 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• 14 days after immunization with sheep red blood cells (SRBCs)

immune system
• 14 days after immunization with sheep red blood cells (SRBCs)




Genotype
MGI:4418148
cn3
Allelic
Composition
Mef2ctm1Eno/Mef2ctm2Eno
Tg(Myog-cre)1Eno/0
Genetic
Background
involves: 129S/SvEv * 129S7/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mef2ctm1Eno mutation (0 available); any Mef2c mutation (34 available)
Mef2ctm2Eno mutation (0 available); any Mef2c mutation (34 available)
Tg(Myog-cre)1Eno mutation (0 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
muscle
• reduction in slow fibers within the soleus
• loss of type I fibers in the gastrocnemius and plantaris muscles and a decrease in number and intensity of type I fibers in the soleus




Genotype
MGI:3719010
cn4
Allelic
Composition
Mef2ctm1Eno/Mef2ctm2Eno
Twist2tm1(cre)Dor/Twist2+
Genetic
Background
involves: 129S/SvEv * 129S7/SvEvBrd * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mef2ctm1Eno mutation (0 available); any Mef2c mutation (34 available)
Mef2ctm2Eno mutation (0 available); any Mef2c mutation (34 available)
Twist2tm1(cre)Dor mutation (0 available); any Twist2 mutation (10 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• none survive beyond the first week of life

respiratory system
• some mutants have difficulty breathing, evidenced by gasping and accumulation of air in the intestines

skeleton
• truncation of the fibula is severe
• truncation of the tibia is severe
• sternum and radius show completely absence of trabeculated bone
• mutants exhibit severe defects in ossification on nearly all endochondral bones, especially in the sternum
• ossification of the bone collar appears disorganized
• defects in endochondral ossification result from a failure of chondrocyte hypertrophy
• vertebral bodies and the supraoccipital bone fail to ossify and many phalangeal bones of the digits lack ossification

limbs/digits/tail
• truncation of the fibula is severe
• truncation of the tibia is severe




Genotype
MGI:3719016
cn5
Allelic
Composition
Mef2ctm1Eno/Mef2ctm2Eno
Tg(Col2a1-cre)1Bhr/0
Genetic
Background
involves: 129S/SvEv * 129S7/SvEvBrd * C57BL/6 * SJL
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mef2ctm1Eno mutation (0 available); any Mef2c mutation (34 available)
Mef2ctm2Eno mutation (0 available); any Mef2c mutation (34 available)
Tg(Col2a1-cre)1Bhr mutation (3 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• truncation of all long bones of the limbs
• structures of the distal ribs, radii, and sternabrae are distorted by disorganized cartilaginous remnants of the growth plate and aberrant ossification
• absence of ossification of the sternum and a failure in chondrocyte hypertrophy

behavior/neurological
• waddling gait due to shortened limbs

limbs/digits/tail
• truncation of all long bones of the limbs




Genotype
MGI:5560657
cn6
Allelic
Composition
Mef2atm1.1Limm/Mef2atm1.1Limm
Mef2ctm2Eno/Mef2ctm2Eno
Mef2dtm3Eno/Mef2dtm3Eno
Tg(GFAP-cre)25Mes/0
Genetic
Background
involves: 129S/SvEv * C57BL/6 * FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mef2atm1.1Limm mutation (0 available); any Mef2a mutation (36 available)
Mef2ctm2Eno mutation (0 available); any Mef2c mutation (34 available)
Mef2dtm3Eno mutation (0 available); any Mef2d mutation (66 available)
Tg(GFAP-cre)25Mes mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• partial lethality by 5 weeks

nervous system
N
• mice exhibit normal numbers of spines per length of dendrite in pyramidal neurons
• mice exhibit decreased input-output curve compared with wild-type mice
• however, long term potentiation is normal

growth/size/body

cellular




Genotype
MGI:3719017
cn7
Allelic
Composition
Mef2ctm2Eno/Mef2ctm2Eno
Mef2dtm1Eno/Mef2dtm1Eno
Tg(Col2a1-cre)1Bhr/0
Genetic
Background
involves: 129S/SvEv * C57BL/6 * SJL
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mef2ctm2Eno mutation (0 available); any Mef2c mutation (34 available)
Mef2dtm1Eno mutation (0 available); any Mef2d mutation (66 available)
Tg(Col2a1-cre)1Bhr mutation (3 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• nearly all mineralized endochondral skeletons are missing





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