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Phenotypes Associated with This Genotype
Genotype
MGI:3697234
Allelic
Composition
Gfi1tm3(Gfib1)Tmo/Gfi1tm3(Gfib1)Tmo
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Gfi1tm3(Gfib1)Tmo mutation (1 available); any Gfi1 mutation (31 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
N
• unlike Gfi1tm1Tmo mutant mice, these homozygotes show normal pre-T-cell development, are not neutropenic, and exhibit no significant expansion of monocytoid cells and a normal distribution of granulocytes (Mac-1hi/Gr-1hi) and monocytes (Mac-1+) in peripheral blood
• no shortened lifespan, granuloma formation or an inherent predisposition to infections is observed
• in bone marrow, homozygotes exhibit slightly reduced frequencies of granulocytes; however, this phenotype is closer to the wild-type configuration than that observed in Gfi1tm1Tmo homozygotes
• the proportion of mature granulocytes is slightly reduced in peripheral blood, while a left shift towards more immature granulocytic precursors is noted in bone marrow
• in bone marrow, homozygotes exhibit a mild accumulation of cells with the immunophenotype of immature myeloid cells or monocytes (Mac-1lo, Gr-1lo); however, this phenotype is closer to the wild-type configuration than that observed in Gfi1tm1Tmo homozygotes
• a few 'atypical monocytes', typical for Gfi1tm1Tmo homozygotes, are also observed in blood and bone marrow

hearing/vestibular/ear
• at P0, homozygotes exhibit a single row of morphologically immature IHCs, similar to Gfi1tm1Tmo homozygotes
• at P0, OHCs appear smaller and disorganized, though less severely affected relative to Gfi1tm1Tmo homozygotes
• at P0, homozygotes display progressive OHC degeneration, albeit at an apparently slower rate relative to to Gfi1tm1Tmo homozygotes
• at 3-3.5 months of age, homozygotes display increased ABR thresholds that are >100 dB at 8 kHz and >90 dB at 16 and 32 kHz, similar to Gfi1tm1Tmo homozygotes
• similar to Gfi1tm1Tmo mutant mice, homozygotes are deaf, suggesting that Gfi1b can replace Gfi1 functionally in haematopoiesis but not in inner ear hair cell development

behavior/neurological
• homozygotes fail to show a Preyer reflex

immune system
• in bone marrow, homozygotes exhibit slightly reduced frequencies of granulocytes; however, this phenotype is closer to the wild-type configuration than that observed in Gfi1tm1Tmo homozygotes
• the proportion of mature granulocytes is slightly reduced in peripheral blood, while a left shift towards more immature granulocytic precursors is noted in bone marrow
• in bone marrow, homozygotes exhibit a mild accumulation of cells with the immunophenotype of immature myeloid cells or monocytes (Mac-1lo, Gr-1lo); however, this phenotype is closer to the wild-type configuration than that observed in Gfi1tm1Tmo homozygotes
• a few 'atypical monocytes', typical for Gfi1tm1Tmo homozygotes, are also observed in blood and bone marrow

nervous system
• at P0, homozygotes exhibit a single row of morphologically immature IHCs, similar to Gfi1tm1Tmo homozygotes
• at P0, OHCs appear smaller and disorganized, though less severely affected relative to Gfi1tm1Tmo homozygotes
• at P0, homozygotes display progressive OHC degeneration, albeit at an apparently slower rate relative to to Gfi1tm1Tmo homozygotes


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)
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last database update
05/28/2024
MGI 6.13
The Jackson Laboratory