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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Sfn+
wild type
MGI:2439556
Summary 5 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
SfnEr/Sfn+ B6CBACa Aw-J/A-SfnEr/J MGI:3765944
ht2
SfnEr/Sfn+ involves: 129/Sv * C57BL/6 MGI:3605876
ht3
SfnEr/Sfn+ Not Specified MGI:5559504
cx4
Irf6tm1Mjd/Irf6+
SfnEr/Sfn+
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 MGI:3693811
cx5
Kdf1shd/Kdf1+
SfnEr/Sfn+
involves: C3HeB/FeJ * C57BL/6J MGI:5559505


Genotype
MGI:3765944
ht1
Allelic
Composition
SfnEr/Sfn+
Genetic
Background
B6CBACa Aw-J/A-SfnEr/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
SfnEr mutation (1 available); any Sfn mutation (13 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Repeated hair loss in SfnEr/Sfn+ mice

integument
• repeated hair loss in adults




Genotype
MGI:3605876
ht2
Allelic
Composition
SfnEr/Sfn+
Genetic
Background
involves: 129/Sv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
SfnEr mutation (1 available); any Sfn mutation (13 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• increased mortality starting at about the time hair loss starts and continuing through weaning and a little after
• mice surviving the post weaning period are fertile and live normal lifespans

growth/size/body
• starting about the same time as hair loss

neoplasm
• 67% frequency in mice older than 6 months
• begin as small sessile or pedunculated papillomas, then most enlarge, and many develop horns
• no evidence of virus particles
• 67% frequency in mice older than 6 months
• squamous cell carcinomas in the fleshy base of large cutaneous horns
• no evidence of virus particles

integument
• first coat lost by 3 weeks then quickly replaced and lost again (J:6200)
• hair loss begins around eyes and nose (J:6200)
• normal until around 13 days when hair loss begins (J:29020)
• 67% frequency in mice older than 6 months
• begin as small sessile or pedunculated papillomas, then most enlarge, and many develop horns
• no evidence of virus particles




Genotype
MGI:5559504
ht3
Allelic
Composition
SfnEr/Sfn+
Genetic
Background
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
SfnEr mutation (1 available); any Sfn mutation (13 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
integument
• eyelids, ears, snout and digit/tail tips

homeostasis/metabolism
• eyelids, ears, snout and digit/tail tips




Genotype
MGI:3693811
cx4
Allelic
Composition
Irf6tm1Mjd/Irf6+
SfnEr/Sfn+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Irf6tm1Mjd mutation (0 available); any Irf6 mutation (24 available)
SfnEr mutation (1 available); any Sfn mutation (13 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
• severe intraoral adhesions prevent opening of mouth at E17
• seen at E17

limbs/digits/tail
• affected pups show forepaw and hindpaw syndactyly
• at E17

digestive/alimentary system
• seen at E17
• fused esophagus is found at E17

integument
• at E17, affected pups have smooth skin
• epidermis is hyperproliferative
• areas of keratinization are frequently detected within and sometimes on surface of expanded suprabasal layers
• mutants have thickened epithelium resulting from expanded stratum spinosum; clearly defined stratum granulosum and stratum corneum do not form toward epidermal surface

growth/size/body
• severe intraoral adhesions prevent opening of mouth at E17
• seen at E17
• at E17, partial fusion of hindlimbs and tail to body wall is observed




Genotype
MGI:5559505
cx5
Allelic
Composition
Kdf1shd/Kdf1+
SfnEr/Sfn+
Genetic
Background
involves: C3HeB/FeJ * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Kdf1shd mutation (0 available); any Kdf1 mutation (17 available)
SfnEr mutation (1 available); any Sfn mutation (13 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• despite Mendelian numbers during embryonic development, only 1 mouse was obtained postnatally

integument
• in several areas, pronounced in the eyelids, ears, snout, digit/tail tips, chin and two dorsal stripes
• breaks in the cornified layer in dorsal stripes
• however, most regions exhibit normal cornified layers

craniofacial
• in the one recovered mouse
• in the one recovered mouse

homeostasis/metabolism
• in several areas, pronounced in the eyelids, ears, snout, digit/tail tips, chin and two dorsal stripes

digestive/alimentary system
• in the one recovered mouse

growth/size/body
• in the one recovered mouse
• in the one recovered mouse





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