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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Mafgtm1Jeng
targeted mutation 1, James Douglas Engel
MGI:2386717
Summary 4 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Mafgtm1Jeng/Mafgtm1Jeng involves: 129S1/Sv * 129X1/SvJ * C57BL/6J MGI:3580874
hm2
Mafgtm1Jeng/Mafgtm1Jeng involves: 129S1/Sv * 129X1/SvJ * CD-1 MGI:3580875
cx3
Mafgtm1Jeng/Mafgtm1Jeng
Mafktm1Jeng/Mafk+
involves: 129S1/Sv * 129X1/SvJ MGI:3580878
cx4
Mafgtm1Jeng/Mafgtm1Jeng
Mafktm1Jeng/Mafktm1Jeng
involves: 129S1/Sv * 129X1/SvJ MGI:3580876


Genotype
MGI:3580874
hm1
Allelic
Composition
Mafgtm1Jeng/Mafgtm1Jeng
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mafgtm1Jeng mutation (0 available); any Mafg mutation (38 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• Background Sensitivity: lower than expected numbers of homozygotes born but not significantly

hematopoietic system
• three fold increase in megakaryocytes in both bone marrow and spleen
• dramatically diminished platelet count

behavior/neurological
• Background Sensitivity: limb grasping behavior seen in mice on a C57BL/6 background after 5-6 months of age
• Background Sensitivity: mice on a C57BL/6 background unable to grasp a wire with hind limbs

growth/size/body
• homozygous females weighed less than control littermates
• weight discrepancies less among males

cellular
• three fold increase in megakaryocytes in both bone marrow and spleen




Genotype
MGI:3580875
hm2
Allelic
Composition
Mafgtm1Jeng/Mafgtm1Jeng
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * CD-1
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mafgtm1Jeng mutation (0 available); any Mafg mutation (38 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• Background Sensitivity: significantly lower than expected numbers of homozygotes born

hematopoietic system
• three fold increase in megakaryocytes in both bone marrow and spleen
• dramatically diminished platelet count

growth/size/body
• homozygous females weighed less than control littermates
• weight discrepancies less among males

cellular
• three fold increase in megakaryocytes in both bone marrow and spleen




Genotype
MGI:3580878
cx3
Allelic
Composition
Mafgtm1Jeng/Mafgtm1Jeng
Mafktm1Jeng/Mafk+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mafgtm1Jeng mutation (0 available); any Mafg mutation (38 available)
Mafktm1Jeng mutation (0 available); any Mafk mutation (13 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• large, mature megakaryocytes found
• failed to form proplatelets
• platelets reduced to near zero

behavior/neurological
• limb grasping behavior develops by 6 weeks in about half of mice
• motor activity repressed by auditory stimuli
• intermittent but long lasting myoclonus in hind limbs of about 2/3 of mice, fully penetrant at 9 weeks of age
• occurs spontaneously but can be triggered by external stimuli such as eating or approaching table edge during free locomotion

nervous system
• intermittent but long lasting myoclonus in hind limbs of about 2/3 of mice, fully penetrant at 9 weeks of age
• occurs spontaneously but can be triggered by external stimuli such as eating or approaching table edge during free locomotion
• neuronal nuclei in the gray matter of the spinal cord are swollen and the cytoplasm was thin

muscle
• intermittent but long lasting myoclonus in hind limbs of about 2/3 of mice, fully penetrant at 9 weeks of age
• occurs spontaneously but can be triggered by external stimuli such as eating or approaching table edge during free locomotion

cellular
• large, mature megakaryocytes found
• failed to form proplatelets




Genotype
MGI:3580876
cx4
Allelic
Composition
Mafgtm1Jeng/Mafgtm1Jeng
Mafktm1Jeng/Mafktm1Jeng
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mafgtm1Jeng mutation (0 available); any Mafg mutation (38 available)
Mafktm1Jeng mutation (0 available); any Mafk mutation (13 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• homozygotes born at considerably reduced numbers
• expected numbers of homozygous embryos at E18.5
• did not survive to weaning

hematopoietic system
• slight splenomegaly
• persistent fetal liver hematopoiesis
• by age 14 days
• often small, round and with irregular shapes
• platelets reduced to near zero
• reticulocyte numbers increased
• irregular reticulocyte morphology
• red blood cells are less stable osmotically

behavior/neurological
• limb grasping behavior seen by 3-4 weeks of age
• severe motor ataxia by 2 months of age
• intermittently spastic hind legs

growth/size/body
• very small at birth
• slight splenomegaly

immune system
• slight splenomegaly





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last database update
04/16/2024
MGI 6.23
The Jackson Laboratory