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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Krt18tm1Tmm
targeted mutation 1, Thomas M Magin
MGI:2178045
Summary 4 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Krt18tm1Tmm/Krt18tm1Tmm involves: 129P2/OlaHsd MGI:7280898
hm2
Krt18tm1Tmm/Krt18tm1Tmm involves: 129/Sv * 129P2/OlaHsd * MF1 MGI:3582984
ht3
Krt18tm1Tmm/Krt18+ involves: 129P2/OlaHsd MGI:7280903
cx4
Krt18tm1Tmm/Krt18tm1Tmm
Krt19tm2Mmt/Krt19tm2Mmt
involves: 129/Sv * 129P2/OlaHsd * 129S2/SvPas * C57BL/6 * FVB/N MGI:3582985


Genotype
MGI:7280898
hm1
Allelic
Composition
Krt18tm1Tmm/Krt18tm1Tmm
Genetic
Background
involves: 129P2/OlaHsd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Krt18tm1Tmm mutation (2 available); any Krt18 mutation (28 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
liver/biliary system
• focal hemorrhagic parenchymal necrosis
• apoptotic bodies are more frequent in livers of male mice
• mild lobular inflammatory activity with foci of mononuclear cells
• mild portal mononuclear cell infiltrate surrounding interlobular bile ducts
• 17-20-month-old mice develop liver lesions resembling steatohepatitis
• however, no liver fibrosis is seen
• focal hemorrhagic parenchymal necrosis, surrounded and penetrated by neutrophils
• aged mice exhibit hepatocyte anisocytosis and anisokaryosis
• hepatocytes show cleared-out cytoplasm in aged mice
• mice sow disseminated single hepatocytes containing erythrocytes, as well as syncytial parenchymal areas with nuclear crowding
• Mallory-Denk bodies (MDBs) appear as irregularly shaped dense eosinophilic cytoplasmic clumps and granules in ballooned hepatocytes, predominantly in perivenular position
• focal necrosis of hepatocytes
• mild to moderate liver steatosis in the majority of mice; fatty change as multiple small and medium-sized cytoplasmic vesicles with gradual coalescence to larger vesicles toward the lobular periphery
• rarely, MDB-containing hepatocytes are surrounded by neutrophils and mononuclear cells
• approximately 80% of male and 35% of females develop liver tumors, with mice developing multiple tumors; distinct non-encapsulated nodules with expanding growth leading to compression of the surrounding parenchyma, and irregular arrangement and morphology of tumor cells
• pleomorphic tumors are more frequent than monomorphic and more prevalent in males than females
• tumors in aged mice closely resemble human hepatocellular carcinoma in their genetic profile

neoplasm
• approximately 80% of male and 35% of females develop liver tumors, with mice developing multiple tumors; distinct non-encapsulated nodules with expanding growth leading to compression of the surrounding parenchyma, and irregular arrangement and morphology of tumor cells
• pleomorphic tumors are more frequent than monomorphic and more prevalent in males than females
• tumors in aged mice closely resemble human hepatocellular carcinoma in their genetic profile

cellular
• apoptotic bodies are more frequent in livers of male mice
• mice show chromosomal instability in liver at 12 months of age, before tumor formation

immune system
• mild lobular inflammatory activity with foci of mononuclear cells
• mild portal mononuclear cell infiltrate surrounding interlobular bile ducts

cardiovascular system
• focal hemorrhagic parenchymal necrosis




Genotype
MGI:3582984
hm2
Allelic
Composition
Krt18tm1Tmm/Krt18tm1Tmm
Genetic
Background
involves: 129/Sv * 129P2/OlaHsd * MF1
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Krt18tm1Tmm mutation (2 available); any Krt18 mutation (28 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
liver/biliary system
• hepatomegaly by 18 months of age

growth/size/body
• hepatomegaly by 18 months of age




Genotype
MGI:7280903
ht3
Allelic
Composition
Krt18tm1Tmm/Krt18+
Genetic
Background
involves: 129P2/OlaHsd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Krt18tm1Tmm mutation (2 available); any Krt18 mutation (28 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
liver/biliary system
• livers show similar lobular and portal inflammation and ductular reaction as in homozygotes
• 17-20-month-old mice develop liver lesions resembling steatohepatitis
• hepatocytes with cleared-out cytoplasm are less abundant than in homozygotes and show zonal and disseminated distribution
• Mallory-Denk body (MDB)-containing hepatocytes are less frequent than in homozygotes and are found in about 40% of livers in males and about 9% of livers in females
• MDBs are less well developed than in homozygotes and granular inclusions prevail
• aged mice develop liver steatosis to the same degree as in homozygotes; steatosis is more conspicuous in some females
• approximately 73% of male and 22% of females develop liver tumors
• pleomorphic tumors are more frequent than monomorphic and more prevalent in males than females

neoplasm
• approximately 73% of male and 22% of females develop liver tumors
• pleomorphic tumors are more frequent than monomorphic and more prevalent in males than females

immune system
• livers show similar lobular and portal inflammation and ductular reaction as in homozygotes

cellular
• mice show chromosomal instability in liver at 12 months of age, before tumor formation




Genotype
MGI:3582985
cx4
Allelic
Composition
Krt18tm1Tmm/Krt18tm1Tmm
Krt19tm2Mmt/Krt19tm2Mmt
Genetic
Background
involves: 129/Sv * 129P2/OlaHsd * 129S2/SvPas * C57BL/6 * FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Krt18tm1Tmm mutation (2 available); any Krt18 mutation (28 available)
Krt19tm2Mmt mutation (0 available); any Krt19 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• no homozygotes at birth
• embryonic death between E9.5 and E10.5

embryo
• embryos smaller than controls but otherwise normal at E9.5
• bleeding in extraembryonic tissues between the maternal deciduas and yolk sac at E10.5
• trophoblast giant cells were cytolytic
• placentas smaller in diameter but otherwise normally developed

growth/size/body
• embryos smaller than controls but otherwise normal at E9.5





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last database update
11/12/2024
MGI 6.24
The Jackson Laboratory