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Phenotypes Associated with This Genotype
Genotype
MGI:5463807
Allelic
Composition		 Atmtm1Shzh/Atmtm2.1Fwa
Gt(ROSA)26Sortm1(cre/ERT2)Thl/Gt(ROSA)26Sor+
Genetic
Background		 involves: 129 * 129S6/SvEvTac
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Atmtm1Shzh mutation (0 available); any Atm mutation (168 available)
Atmtm2.1Fwa mutation (2 available); any Atm mutation (168 available)
Gt(ROSA)26Sortm1(cre/ERT2)Thl mutation (0 available); any Gt(ROSA)26Sor mutation (1062 available)
♀ phenotype observed in females
♂ phenotype observed in males
N normal phenotype
cellular
chromosomal instability ( J:191288 )
• B cells from tamoxifen-treated mice exhibit reduced class switch recombination with increased genomic instability (especially chromatid breaks) compared with wild-type cells but at the same level as in Atmtm1Fwa cells

immune system
abnormal class switch recombination ( J:191288 )
• B cells from tamoxifen-treated mice exhibit reduced class switch recombination with increased genomic instability (especially chromatid breaks) compared with wild-type cells but at the same level as in Atmtm1Fwa cells

hematopoietic system
abnormal class switch recombination ( J:191288 )
• B cells from tamoxifen-treated mice exhibit reduced class switch recombination with increased genomic instability (especially chromatid breaks) compared with wild-type cells but at the same level as in Atmtm1Fwa cells

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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Send questions and comments to User Support. 		last database update
01/06/2026
MGI 6.24 		The Jackson Laboratory