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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Mesp1/Mesp2tm1Ysa
targeted mutation 1, Yumiko Saga
MGI:2386200
Summary 5 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Mesp1/Mesp2tm1Ysa/Mesp1/Mesp2tm1Ysa involves: C57BL/6 * CBA * ICR MGI:3702328
cx2
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm8Ysa
involves: C57BL/6 * CBA * ICR MGI:3709547
cx3
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm9Ysa
involves: C57BL/6 * CBA * ICR MGI:3709548
cx4
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm11Ysa
involves: C57BL/6 * CBA * ICR MGI:3709549
cx5
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm10Ysa
involves: C57BL/6 * CBA * ICR MGI:3709550


Genotype
MGI:3702328
hm1
Allelic
Composition
Mesp1/Mesp2tm1Ysa/Mesp1/Mesp2tm1Ysa
Genetic
Background
involves: C57BL/6 * CBA * ICR
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mesp1/Mesp2tm1Ysa mutation (2 available); any Mesp1 mutation (18 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging

growth/size/body
• smaller at E7.5, especially in the anterior region

embryo
• dense cell accumulation in the primitive streak indicates the initiation of gastrulation and the ingression of ectodermal cells into the primitive streak, but the mesodermal cells are unable to depart from the primitive streak
• embryonic ectoderm expresses only anterior neuronal markers at E9.5
• marker analysis indicates a lack of active migration of the definitive endoderm
• analysis of molecular markers indicates a lack of the cranio-cardiac and paraxial mesoderm, however the axial mesoderm is initially generated but anterior extension is halted after E8.5
• smaller at E7.5, especially in the anterior region
• lack of paraxial mesoderm
• lack the mesodermal layer between the endoderm and ectoderm at E7.5
• abnormal accumulation of cells in the primitive streak indicates an inability of mesodermal cells to migrate out of the streak
• do not develop somites

cardiovascular system
• develop endothelial cells indicating that the initiation of vasculogenesis occurs, however no distinct blood vessels are seen
• do not develop a heart




Genotype
MGI:3709547
cx2
Allelic
Composition
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm8Ysa
Genetic
Background
involves: C57BL/6 * CBA * ICR
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mesp1/Mesp2tm1Ysa mutation (2 available); any Mesp1 mutation (18 available)
Mesp1/Mesp2tm1Ysa mutation (0 available); any Mesp2 mutation (30 available)
Mesp2tm8Ysa mutation (1 available); any Mesp2 mutation (30 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• at E17.5, 6.5 ribs are fused in 2 of 2 mice




Genotype
MGI:3709548
cx3
Allelic
Composition
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm9Ysa
Genetic
Background
involves: C57BL/6 * CBA * ICR
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mesp1/Mesp2tm1Ysa mutation (2 available); any Mesp1 mutation (18 available)
Mesp1/Mesp2tm1Ysa mutation (0 available); any Mesp2 mutation (30 available)
Mesp2tm9Ysa mutation (1 available); any Mesp2 mutation (30 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• at E17.5, 16 ribs are fused in 3 of 3 mice




Genotype
MGI:3709549
cx4
Allelic
Composition
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm11Ysa
Genetic
Background
involves: C57BL/6 * CBA * ICR
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mesp1/Mesp2tm1Ysa mutation (2 available); any Mesp1 mutation (18 available)
Mesp1/Mesp2tm1Ysa mutation (0 available); any Mesp2 mutation (30 available)
Mesp2tm11Ysa mutation (0 available); any Mesp2 mutation (30 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• caudal vertebra are malformed and a posterior expansion of defects is seen
• more severe fusion of vertebra than in mice containing Mesp2 disruptions pedicles are fused




Genotype
MGI:3709550
cx5
Allelic
Composition
Mesp1/Mesp2tm1Ysa/Mesp1+
Mesp1/Mesp2tm1Ysa/Mesp2tm10Ysa
Genetic
Background
involves: C57BL/6 * CBA * ICR
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mesp1/Mesp2tm1Ysa mutation (2 available); any Mesp1 mutation (18 available)
Mesp1/Mesp2tm1Ysa mutation (0 available); any Mesp2 mutation (30 available)
Mesp2tm10Ysa mutation (1 available); any Mesp2 mutation (30 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
growth/size/body
• shortening of the trunk region

skeleton
• severe truncation of the vertebra
• severe fusion





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last database update
10/22/2024
MGI 6.24
The Jackson Laboratory