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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Ext1+
wild type
MGI:2434557
Summary 8 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
Ext1tm1.2Vcs/Ext1+ involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * SJL MGI:4437601
ht2
Ext1tm1.1Yama/Ext1+ involves: 129S4/SvJaeSor * 129S5/SvEvBrd MGI:4818629
ht3
Ext1tm1Dews/Ext1+ involves: 129S7/SvEvBrd * C57BL/6 MGI:3848979
cn4
Ext1tm1Yama/Ext1+
H2az2Tg(Wnt1-cre)11Rth/H2az2+
Tgfb2tm1Doe/Tgfb2+
B6.Cg-Tgfb2tm1Doe H2az2Tg(Wnt1-cre)11Rth Ext1tm1Yama MGI:4360749
cn5
Ext1tm1Vcs/Ext1+
Hprt1tm1(CAG-cre)Mnn/Hprt1+
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 MGI:4437603
cn6
Ext1tm1Vcs/Ext1+
Tg(Col2a1-rtTA,tetO-cre)22Pjro/0
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 MGI:4437606
cn7
Ext1tm1Vcs/Ext1+
Tg(Col2a1-cre)1Bhr/0
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * SJL MGI:4437602
cn8
Ext1tm1Yama/Ext1+
Slit2tm1Matl/Slit2tm1Matl
Tg(Nes-cre)1Kln/0
involves: 129S2/SvPas * 129S5/SvEvBrd * C57BL/6 * SJL MGI:2682063


Genotype
MGI:4437601
ht1
Allelic
Composition
Ext1tm1.2Vcs/Ext1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * SJL
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1.2Vcs mutation (0 available); any Ext1 mutation (63 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
N
• pups are born at normal Mendelian ratios




Genotype
MGI:4818629
ht2
Allelic
Composition
Ext1tm1.1Yama/Ext1+
Genetic
Background
involves: 129S4/SvJaeSor * 129S5/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1.1Yama mutation (0 available); any Ext1 mutation (63 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
neoplasm
• in the rib bones from 4 of 16 mice

skeleton
• in the rib bones from 4 of 16 mice




Genotype
MGI:3848979
ht3
Allelic
Composition
Ext1tm1Dews/Ext1+
Genetic
Background
involves: 129S7/SvEvBrd * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1Dews mutation (0 available); any Ext1 mutation (63 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• no observable bone deformities or exostoses at E14.5 or E18.5 no observable bone deformities or exostoses at E14.5 or E18.5
• humeri, femora, and tibias all normal in length an ossification at E18.5 although increased variability observed




Genotype
MGI:4360749
cn4
Allelic
Composition
Ext1tm1Yama/Ext1+
H2az2Tg(Wnt1-cre)11Rth/H2az2+
Tgfb2tm1Doe/Tgfb2+
Genetic
Background
B6.Cg-Tgfb2tm1Doe H2az2Tg(Wnt1-cre)11Rth Ext1tm1Yama
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1Yama mutation (0 available); any Ext1 mutation (63 available)
H2az2Tg(Wnt1-cre)11Rth mutation (2 available); any H2az2 mutation (25 available)
Tgfb2tm1Doe mutation (2 available); any Tgfb2 mutation (34 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Thin cornea and iridocorneal dysgenesis in Ext1tm1Yama/Ext1+ H2az2Tg(Wnt1-cre)11Rth/0 Tgfb2tm1Doe/Tgfb2+ mice

mortality/aging
N
• mice survive into adulthood

vision/eye
• mice exhibit defects in components of the aqueous drainage system
• however, the iridocorneal angle is normal
• the trabecular beam contains fewer cells than in wild-type mice
• mice exhibit ocular hypertension unlike single heterozygotes




Genotype
MGI:4437603
cn5
Allelic
Composition
Ext1tm1Vcs/Ext1+
Hprt1tm1(CAG-cre)Mnn/Hprt1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1Vcs mutation (1 available); any Ext1 mutation (63 available)
Hprt1tm1(CAG-cre)Mnn mutation (1 available); any Hprt1 mutation (1280 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• no viable embryos are recovered at E11.5




Genotype
MGI:4437606
cn6
Allelic
Composition
Ext1tm1Vcs/Ext1+
Tg(Col2a1-rtTA,tetO-cre)22Pjro/0
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1Vcs mutation (1 available); any Ext1 mutation (63 available)
Tg(Col2a1-rtTA,tetO-cre)22Pjro mutation (0 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• with doxycycline induction of cre activity during gestation, only 1 pup was observed
• without doxycycline induction during gestation, viable offspring are generated

neoplasm
N
• mice exhibit no osteochondromas at 6-10 weeks of age with doxycycline induction from P8 to 15




Genotype
MGI:4437602
cn7
Allelic
Composition
Ext1tm1Vcs/Ext1+
Tg(Col2a1-cre)1Bhr/0
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * SJL
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1Vcs mutation (1 available); any Ext1 mutation (63 available)
Tg(Col2a1-cre)1Bhr mutation (3 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• no animals are recovered at weaning




Genotype
MGI:2682063
cn8
Allelic
Composition
Ext1tm1Yama/Ext1+
Slit2tm1Matl/Slit2tm1Matl
Tg(Nes-cre)1Kln/0
Genetic
Background
involves: 129S2/SvPas * 129S5/SvEvBrd * C57BL/6 * SJL
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ext1tm1Yama mutation (0 available); any Ext1 mutation (63 available)
Slit2tm1Matl mutation (2 available); any Slit2 mutation (88 available)
Tg(Nes-cre)1Kln mutation (4 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
nervous system
• 59-67% of retinal axons project ectopically into the contralateral optic nerve

cellular
• 59-67% of retinal axons project ectopically into the contralateral optic nerve





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last database update
03/18/2025
MGI 6.24
The Jackson Laboratory