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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Ss18tm1Adg
targeted mutation 1, A Geurts van Kissel
MGI:3690630
Summary 4 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Ss18tm1Adg/Ss18tm1Adg B6.Cg-Ss18tm1Adg MGI:3691343
hm2
Ss18tm1Adg/Ss18tm1Adg involves: C57BL/6 MGI:3691341
ht3
Ss18tm1Adg/Ss18+ involves: C57BL/6 MGI:3691342
cx4
Ss18tm1Adg/Ss18+
Ss18l1tm1Ghsh/Ss18l1tm1Ghsh
involves: 129 * C57BL/6 MGI:3691344


Genotype
MGI:3691343
hm1
Allelic
Composition
Ss18tm1Adg/Ss18tm1Adg
Genetic
Background
B6.Cg-Ss18tm1Adg
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ss18tm1Adg mutation (0 available); any Ss18 mutation (40 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• Background Sensitivity: onset of embryonic lethality occurs earlier than in the mixed background as embryos show signs of resorption at E9.5, however stage when initiation of lethality occurs is not stated




Genotype
MGI:3691341
hm2
Allelic
Composition
Ss18tm1Adg/Ss18tm1Adg
Genetic
Background
involves: C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ss18tm1Adg mutation (0 available); any Ss18 mutation (40 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• Background Sensitivity: lethality is initiated after E8.5 but before E9.5 and resorption is observed at E11.5 and E13.5, later than on a congenic C57BL/6 background

growth/size/body
• about 50% exhibit a swollen heart
• 90% of E9.5 embryos exhibit growth retardation that varies from rudimentary embryos within the embryonic membranes to embryos lagging behind and estimated to be at E8.5

embryo
• exhibit little or no embryonic turning at E9.5
• developmental arrest occurs just after gastrulation as mutants show little or no embryonic turning
• 90% of E9.5 embryos exhibit growth retardation that varies from rudimentary embryos within the embryonic membranes to embryos lagging behind and estimated to be at E8.5
• neural tube is only partially closed at E9.5
• seen at E9.5
• exhibit impaired placental vascularization and vascular branching
• blood vessels are either located outside the placenta or exclusively near the base where the surrounding trophoblast tissue is very compact, and never in close proximity to the maternal sinuses
• the number of blood vessels in the prospective labyrinth is reduced
• chorionic plate of placentas is composed of densely packed trophoblasts and does not exhibit vascularization
• labyrinth development is disturbed
• impaired placental development, either through incomplete chorio-allantoic fusion or through a defect in the subsequent process of vascular branching morphogenesis
• observe the formation of an allantoic ball, indicating impaired chorioallantoic fusion

cardiovascular system
• about 50% exhibit dilated blood vessels in the head region
• exhibit impaired placental vascularization and vascular branching
• blood vessels are either located outside the placenta or exclusively near the base where the surrounding trophoblast tissue is very compact, and never in close proximity to the maternal sinuses
• the number of blood vessels in the prospective labyrinth is reduced
• about 50% exhibit a swollen heart
• about 50% are hemorrhagic

nervous system
• neural tube is only partially closed at E9.5
• seen at E9.5

homeostasis/metabolism
• exhibit oxygen shortage as indicated by hemorrhage, dilated blood vessels, and swollen heart




Genotype
MGI:3691342
ht3
Allelic
Composition
Ss18tm1Adg/Ss18+
Genetic
Background
involves: C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ss18tm1Adg mutation (0 available); any Ss18 mutation (40 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• show an underrepresentation of heterozygotes at weaning, however stage of lethality is not specified

growth/size/body
• 43% of E9.5 embryos exhibit growth retardation

embryo
• 43% of E9.5 embryos exhibit growth retardation




Genotype
MGI:3691344
cx4
Allelic
Composition
Ss18tm1Adg/Ss18+
Ss18l1tm1Ghsh/Ss18l1tm1Ghsh
Genetic
Background
involves: 129 * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ss18l1tm1Ghsh mutation (0 available); any Ss18l1 mutation (18 available)
Ss18tm1Adg mutation (0 available); any Ss18 mutation (40 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mutants are identified at E9.5 and E18.5 but not after birth, indicating perinatal lethality





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last database update
12/10/2024
MGI 6.24
The Jackson Laboratory