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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Ightm2Cgn
targeted mutation 2, University of Cologne
MGI:2388486
Summary 15 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
\Ightm2Cgn/\Igh+ involves: 129P2/OlaHsd * BALB/c * C57BL/Ka MGI:3687253
ht2
\Ightm2Cgn/\Igh+ involves: 129P2/OlaHsd * C57BL/6 MGI:3830848
ht3
\Ightm2Cgn/\Ightm4.1Fwa involves: 129P2/OlaHsd * 129S6/SvEvTac MGI:5295455
ht4
\Ightm2Cgn/\Ightm3Cgn involves: 129P2/OlaHsd * BALB/c * C57BL/6 * C57BL/Ka MGI:3687257
ht5
\Ightm1Cgn/\Ightm2Cgn involves: 129P2/OlaHsd * BALB/c * C57BL/Ka MGI:3687254
cn6
\Ezh2tm1Tara/\Ezh2tm1Tara
\Ightm2Cgn/?
\Tg(Mx1-cre)1Cgn/0
involves: 129P2/OlaHsd * C57BL/6 * CBA MGI:4440625
cx7
\Ightm2Cgn/\Igh+
\Igktm1Rsky/\Igk+
either: (involves: 129P2/OlaHsd) or (involves: 129P2/OlaHsd * BALB/c) MGI:3689733
cx8
\Ightm2Cgn/\Igh+
\Igktm2Rsky/\Igk+
involves: 129P2/OlaHsd MGI:3851175
cx9
\Ightm2Cgn/\Ightm2Cgn
\Igktm1Rsky/\Igktm1Rsky
\Trp53tm1Tyj/\Trp53tm1Tyj
\Xrcc4tm1Fwa/\Xrcc4tm1Fwa
involves: 129P2/OlaHsd * 129S2/SvPas * 129S6/SvEvTac MGI:4437907
cx10
\Ightm2Cgn/\Ightm2Cgn
\Igktm1Rsky/\Igktm1Rsky
\Lig4tm1Fwa/\Lig4tm1Fwa
\Trp53tm1Tyj/\Trp53tm1Tyj
involves: 129P2/OlaHsd * 129S2/SvPas * 129S6/SvEvTac MGI:4437910
cx11
\Ightm2Cgn/\Igh+
\Xrcc6tm1Fwa/\Xrcc6tm1Fwa
involves: 129P2/OlaHsd * 129S6/SvEvTac * C57BL/6 MGI:3769719
cx12
\Ightm2Cgn/\Igh+
\Rr158tm1Cgn/\Rr158tm1Cgn
\Arhgef1tm1.1Rmt/\Arhgef1tm1.1Rmt
involves: 129P2/OlaHsd * C57BL/6 MGI:3687248
cx13
\Fnip1tm1.2Baba/\Fnip1tm1.2Baba
\Ightm2Cgn/\Ightm2Cgn
involves: 129P2/OlaHsd * C57BL/6 * FVB/N * SJL MGI:5445167
cx14
\Fnip1Gt(RRM154)Byg/\Fnip1Gt(RRM154)Byg
\Ightm2Cgn/\Ightm2Cgn
involves: 129P2/OlaHsd * C57BL/6 * FVB/N * SJL MGI:5445168
cx15
\Ightm2Cgn/\Igh+
\Igktm2Rsky/\Igk+
\Prkdcscid/\Prkdcscid
involves: 129P2/OlaHsd * BALB/c * C57BL/Ka MGI:3851176


Genotype
MGI:3687253
ht1
Allelic
Composition
\Ightm2Cgn/\Igh+
Genetic
Background
involves: 129P2/OlaHsd * BALB/c * C57BL/Ka
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• reduced number of CD43+ B cell progenitors; however, the overall number of splenic B cells is similar to wild-type

hematopoietic system
• reduced number of CD43+ B cell progenitors; however, the overall number of splenic B cells is similar to wild-type




Genotype
MGI:3830848
ht2
Allelic
Composition
\Ightm2Cgn/\Igh+
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• the percentage of B cells expressing lambda light chain is about 2 times higher than in wild-type mice

immune system
• the percentage of B cells expressing lambda light chain is about 2 times higher than in wild-type mice




Genotype
MGI:5295455
ht3
Allelic
Composition
\Ightm2Cgn/\Ightm4.1Fwa
Genetic
Background
involves: 129P2/OlaHsd * 129S6/SvEvTac
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Ightm4.1Fwa mutation (0 available); any Igh mutation (41 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• the frequency of recombination is shifted and more non-productive rearrangements are produced

immune system
• the frequency of recombination is shifted and more non-productive rearrangements are produced




Genotype
MGI:3687257
ht4
Allelic
Composition
\Ightm2Cgn/\Ightm3Cgn
Genetic
Background
involves: 129P2/OlaHsd * BALB/c * C57BL/6 * C57BL/Ka
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Ightm3Cgn mutation (0 available); any Igh mutation (41 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• reduced number of CD43+ B cell progenitors; however, the overall number of splenic B cells is similar to wild-type

hematopoietic system
• reduced number of CD43+ B cell progenitors; however, the overall number of splenic B cells is similar to wild-type




Genotype
MGI:3687254
ht5
Allelic
Composition
\Ightm1Cgn/\Ightm2Cgn
Genetic
Background
involves: 129P2/OlaHsd * BALB/c * C57BL/Ka
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm1Cgn mutation (0 available); any Igh mutation (41 available)
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• reduced number of CD43+ B cell progenitors; however, the overall number of splenic B cells is similar to wild-type

hematopoietic system
• reduced number of CD43+ B cell progenitors; however, the overall number of splenic B cells is similar to wild-type




Genotype
MGI:4440625
cn6
Allelic
Composition
\Ezh2tm1Tara/\Ezh2tm1Tara
\Ightm2Cgn/?
\Tg(Mx1-cre)1Cgn/0
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6 * CBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ezh2tm1Tara mutation (2 available); any Ezh2 mutation (70 available)
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Tg(Mx1-cre)1Cgn mutation (10 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
N
• mice injected with poly(I)poly(C) exhibit normal B cell development




Genotype
MGI:3689733
cx7
Allelic
Composition
\Ightm2Cgn/\Igh+
\Igktm1Rsky/\Igk+
Genetic
Background
either: (involves: 129P2/OlaHsd) or (involves: 129P2/OlaHsd * BALB/c)
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Igktm1Rsky mutation (1 available); any Igk mutation (28 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• about 90% of B cells are positive for the B1-8 heavy chain
• the CD43- sIgM- pre B cell compartment is virtually absent

hematopoietic system
• about 90% of B cells are positive for the B1-8 heavy chain
• the CD43- sIgM- pre B cell compartment is virtually absent




Genotype
MGI:3851175
cx8
Allelic
Composition
\Ightm2Cgn/\Igh+
\Igktm2Rsky/\Igk+
Genetic
Background
involves: 129P2/OlaHsd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Igktm2Rsky mutation (1 available); any Igk mutation (28 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• B cells have about a 2-fold increase in class switch recombination to IgG1

immune system
• B cells have about a 2-fold increase in class switch recombination to IgG1




Genotype
MGI:4437907
cx9
Allelic
Composition
\Ightm2Cgn/\Ightm2Cgn
\Igktm1Rsky/\Igktm1Rsky
\Trp53tm1Tyj/\Trp53tm1Tyj
\Xrcc4tm1Fwa/\Xrcc4tm1Fwa
Genetic
Background
involves: 129P2/OlaHsd * 129S2/SvPas * 129S6/SvEvTac
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Igktm1Rsky mutation (1 available); any Igk mutation (28 available)
Trp53tm1Tyj mutation (12 available); any Trp53 mutation (249 available)
Xrcc4tm1Fwa mutation (0 available); any Xrcc4 mutation (26 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• class switching to IgG1 is 20% to 50% of wild-type
• class switching to IgG3 is 50% of wild-type
• IgH class switching is reduced compared to in wild-type B cells

cellular
• B cell stimulated with anti-CD40 and IL4 exhibit metaphase chromosome breaks unlike similarly treated wild-type cells

hematopoietic system
• class switching to IgG1 is 20% to 50% of wild-type
• class switching to IgG3 is 50% of wild-type
• IgH class switching is reduced compared to in wild-type B cells




Genotype
MGI:4437910
cx10
Allelic
Composition
\Ightm2Cgn/\Ightm2Cgn
\Igktm1Rsky/\Igktm1Rsky
\Lig4tm1Fwa/\Lig4tm1Fwa
\Trp53tm1Tyj/\Trp53tm1Tyj
Genetic
Background
involves: 129P2/OlaHsd * 129S2/SvPas * 129S6/SvEvTac
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Igktm1Rsky mutation (1 available); any Igk mutation (28 available)
Lig4tm1Fwa mutation (2 available); any Lig4 mutation (46 available)
Trp53tm1Tyj mutation (12 available); any Trp53 mutation (249 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• class switching to IgG1 in B cells stimulated with anti-CD40 plus IL4 are 50% of wild-type

immune system
• class switching to IgG1 in B cells stimulated with anti-CD40 plus IL4 are 50% of wild-type




Genotype
MGI:3769719
cx11
Allelic
Composition
\Ightm2Cgn/\Igh+
\Xrcc6tm1Fwa/\Xrcc6tm1Fwa
Genetic
Background
involves: 129P2/OlaHsd * 129S6/SvEvTac * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Xrcc6tm1Fwa mutation (2 available); any Xrcc6 mutation (63 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
immune system
• mice carrying a rearranged IgH (heavy chain) variable region from a B1-8 clone and homozygous for Xrcc6tm1Fwa exhibit small but detectable populations of peripheral kappa-light chain expressing IgM+ B cells with functional light chain rearrangements; this indicates that some light chain rearrangment can occur in Xrcc6-deficient mice and the defect in B cell differentiation is "leaky"

hematopoietic system
• mice carrying a rearranged IgH (heavy chain) variable region from a B1-8 clone and homozygous for Xrcc6tm1Fwa exhibit small but detectable populations of peripheral kappa-light chain expressing IgM+ B cells with functional light chain rearrangements; this indicates that some light chain rearrangment can occur in Xrcc6-deficient mice and the defect in B cell differentiation is "leaky"




Genotype
MGI:3687248
cx12
Allelic
Composition
\Ightm2Cgn/\Igh+
\Rr158tm1Cgn/\Rr158tm1Cgn
\Arhgef1tm1.1Rmt/\Arhgef1tm1.1Rmt
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Arhgef1tm1.1Rmt mutation (0 available); any Arhgef1 mutation (73 available)
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Rr158tm1Cgn mutation (0 available); any Rr158 mutation (0 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
cellular
• increase in the proportion of cells that migrate towards high sphingosine 1-phosphate (S1P) concentrations
• reduction in migratory response towards S1P induced by LPS treatment is decreased compared to wild-type
• immunization with a low dose of T cell dependent antigen (NP-CG) fails to suppress responsiveness to S1P unlike in wild-type mice; however, treatment with a high concentration of antigen does reduce S1P responsiveness

immune system
• increase in the proportion of cells that migrate towards high sphingosine 1-phosphate (S1P) concentrations
• reduction in migratory response towards S1P induced by LPS treatment is decreased compared to wild-type
• immunization with a low dose of T cell dependent antigen (NP-CG) fails to suppress responsiveness to S1P unlike in wild-type mice; however, treatment with a high concentration of antigen does reduce S1P responsiveness

hematopoietic system
• increase in the proportion of cells that migrate towards high sphingosine 1-phosphate (S1P) concentrations
• reduction in migratory response towards S1P induced by LPS treatment is decreased compared to wild-type
• immunization with a low dose of T cell dependent antigen (NP-CG) fails to suppress responsiveness to S1P unlike in wild-type mice; however, treatment with a high concentration of antigen does reduce S1P responsiveness




Genotype
MGI:5445167
cx13
Allelic
Composition
\Fnip1tm1.2Baba/\Fnip1tm1.2Baba
\Ightm2Cgn/\Ightm2Cgn
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6 * FVB/N * SJL
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fnip1tm1.2Baba mutation (0 available); any Fnip1 mutation (60 available)
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• absence of peripheral B cells

immune system
• absence of peripheral B cells




Genotype
MGI:5445168
cx14
Allelic
Composition
\Fnip1Gt(RRM154)Byg/\Fnip1Gt(RRM154)Byg
\Ightm2Cgn/\Ightm2Cgn
Genetic
Background
involves: 129P2/OlaHsd * C57BL/6 * FVB/N * SJL
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fnip1Gt(RRM154)Byg mutation (0 available); any Fnip1 mutation (60 available)
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• absence of peripheral B cells

immune system
• absence of peripheral B cells




Genotype
MGI:3851176
cx15
Allelic
Composition
\Ightm2Cgn/\Igh+
\Igktm2Rsky/\Igk+
\Prkdcscid/\Prkdcscid
Genetic
Background
involves: 129P2/OlaHsd * BALB/c * C57BL/Ka
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ightm2Cgn mutation (1 available); any Igh mutation (41 available)
Igktm2Rsky mutation (1 available); any Igk mutation (28 available)
Prkdcscid mutation (180 available); any Prkdc mutation (420 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hematopoietic system
• B cells show defects in CSR to IgG1 and IgG3 ranging from 30%?70% of controls

immune system
• B cells show defects in CSR to IgG1 and IgG3 ranging from 30%?70% of controls





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last database update
03/25/2025
MGI 6.24
The Jackson Laboratory