About   Help   FAQ
Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Fgf8tm1Mrc
targeted mutation 1, Mario R Capecchi
MGI:2150350
Summary 15 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Fgf8tm1Mrc/Fgf8tm1Mrc Not Specified MGI:2176852
ht2
Fgf8tm1Mrc/Fgf8tm3Mrc involves: 129 * C57BL/6 MGI:3662677
ht3
Fgf8tm1Mrc/Fgf8tm2Mrc Not Specified MGI:2176853
cn4
Fgf8tm2Moon/Fgf8tm1Mrc
Isl1tm1(cre)Sev/Isl1+
involves: 129S/Sv MGI:3639731
cn5
Fgf8tm1Mrc/Fgf8tm2Moon
Isl1tm1(cre)Sev/Isl1+
involves: 129S/Sv * Black Swiss * C57BL/6 MGI:3829040
cn6
Fgf8tm1Mrc/Fgf8tm2Mrc
Hoxa3tm1(cre)Moon/Hoxa3+
involves: 129/Sv * C57BL/6 MGI:2686876
cn7
Fgf8tm1Mrc/Fgf8tm1Moon
Tfap2atm1(cre)Moon/Tfap2a+
involves: 129/Sv * C57BL/6 MGI:2686875
cn8
Fgf8tm1Mrc/Fgf8tm2Mrc
Tfap2atm1(cre)Moon/Tfap2a+
involves: 129/Sv * C57BL/6 MGI:2686873
cn9
Fgf8tm1Mrc/Fgf8tm1Moon
Hoxa3tm1(cre)Moon/Hoxa3+
involves: 129/Sv * C57BL/6 MGI:2686877
cn10
Fgf8tm2Moon/Fgf8tm1Mrc
Mesp1tm2(cre)Ysa/Mesp1+
involves: C57BL/6 * CBA MGI:3639730
cn11
Fgf8tm2Moon/Fgf8tm1Mrc
Tg(Mef2c-cre)2Blk/0
Not Specified MGI:3639738
cn12
Fgf8tm1Mrc/Fgf8tm2Moon
Foxa2tm2.1(cre/Esr1*)Moon/Foxa2+
Not Specified MGI:3829041
cn13
Fgf8tm1Mrc/Fgf8tm2Mrc
Tg(Rarb-cre)1Mrc/0
Not Specified MGI:2176855
cx14
Fgf8tm1Mrc/Fgf8+
Fgfr3tm1.1Aomw/Fgfr3+
involves: 129 * BALB/c * C57BL/6 MGI:3831408
cx15
Fgf8tm1Mrc/Fgf8+
Fgf9tm1Dor/Fgf9+
Fgfr3tm1.1Aomw/Fgfr3+
involves: 129 * BALB/c * C57BL/6 MGI:3831411


Genotype
MGI:2176852
hm1
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm1Mrc
Genetic
Background
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging




Genotype
MGI:3662677
ht2
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm3Mrc
Genetic
Background
involves: 129 * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm3Mrc mutation (0 available); any Fgf8 mutation (18 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• 100% die in the neonatal period

growth/size/body

cardiovascular system
• cardiovascular defects
• hypoplastic third pharyngeal arch artery
• severe cardiac outflow tract septation and alignment defects

craniofacial
• craniofacial defects
• hypoplastic third pharyngeal arch artery

embryo
• hypoplastic third pharyngeal arch artery
• exhibit an increase in apoptosis of neural crest cells migrating from rhomobomeres 6-8 into the lateral regions of pharyngeal arch 3 and developing pharyngeal arches 4 and 6

homeostasis/metabolism

cellular
• exhibit an increase in apoptosis of neural crest cells migrating from rhomobomeres 6-8 into the lateral regions of pharyngeal arch 3 and developing pharyngeal arches 4 and 6




Genotype
MGI:2176853
ht3
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm2Mrc
Genetic
Background
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Mrc mutation (0 available); any Fgf8 mutation (18 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
normal phenotype




Genotype
MGI:3639731
cn4
Allelic
Composition
Fgf8tm2Moon/Fgf8tm1Mrc
Isl1tm1(cre)Sev/Isl1+
Genetic
Background
involves: 129S/Sv
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Moon mutation (0 available); any Fgf8 mutation (18 available)
Isl1tm1(cre)Sev mutation (1 available); any Isl1 mutation (33 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• severely affected mutants (35%) die by E10; most (65%) survive to birth

embryo
• at E8.75 -10.5, surviving mutants have small pharyngeal arches

cellular
• excess apoptotic cells are detected at the 7-9 somite stage in ventral endoderm and adjacent smooth muscle

cardiovascular system
• conotruncal cushions are hypocellular compared to controls; fusion of cushions to form AP septum is delayed in mutants
• 100% of E18.5/newborns have PTA
• at E8.75 -10.5, surviving mutants have severe right ventricle hypoplasia

craniofacial
• at E8.75 -10.5, surviving mutants have small pharyngeal arches




Genotype
MGI:3829040
cn5
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm2Moon
Isl1tm1(cre)Sev/Isl1+
Genetic
Background
involves: 129S/Sv * Black Swiss * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Moon mutation (0 available); any Fgf8 mutation (18 available)
Isl1tm1(cre)Sev mutation (1 available); any Isl1 mutation (33 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
cardiovascular system
• in explants no cells manage to successfully undergo endothelial to mesenchymal transformation
• outflow tracts are short and abnormally angulated
• outflow tract cushions contain less cardiac jelly and fewer mesenchymal cells
• proximal outflow tract cushions are thinner and contain fewer cells while distal cushions are thinner but do not display a change in cell density
• all show type III PTA (the outflow tract is unseptated along its entire proximodstal extent)




Genotype
MGI:2686876
cn6
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm2Mrc
Hoxa3tm1(cre)Moon/Hoxa3+
Genetic
Background
involves: 129/Sv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Mrc mutation (0 available); any Fgf8 mutation (18 available)
Hoxa3tm1(cre)Moon mutation (1 available); any Hoxa3 mutation (24 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• 30% die during the neonatal period because of lethal cardiovascular malformations

cardiovascular system
• pharyngeal arch artery defects
• defect in vascular tube formation in the fourth pharyngeal arch
• exhibit an abnormally large third pharyngeal arch artery
• only 1 of 33 have severe perturbation of outflow tract septation and alignment (Tetralogy of Fallot and BAV)
• coronary vascular defects
• 23% exhibit bicuspid aortic valves

hematopoietic system
• exhibit thymic hypoplasia, however do not see bilateral thymic aplasia

endocrine/exocrine glands
• parathyroid ectopy, hypoplasia, and aplasia
• parathyroid gland aplasia
• exhibit thymic hypoplasia, however do not see bilateral thymic aplasia

immune system
• exhibit thymic hypoplasia, however do not see bilateral thymic aplasia

craniofacial
• pharyngeal arch artery defects
• defect in vascular tube formation in the fourth pharyngeal arch
• exhibit an abnormally large third pharyngeal arch artery

embryo
• pharyngeal arch artery defects
• defect in vascular tube formation in the fourth pharyngeal arch
• exhibit an abnormally large third pharyngeal arch artery
• exhibit an increase in apoptosis of neural crest cells migrating from rhomobomeres 6-8

cellular
• exhibit an increase in apoptosis of neural crest cells migrating from rhomobomeres 6-8




Genotype
MGI:2686875
cn7
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm1Moon
Tfap2atm1(cre)Moon/Tfap2a+
Genetic
Background
involves: 129/Sv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Moon mutation (1 available); any Fgf8 mutation (18 available)
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Tfap2atm1(cre)Moon mutation (1 available); any Tfap2a mutation (39 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• those that survive to birth die postnatally due to lethal vascular defects in 30% and severe craniofacial defects in 100% of mutants
• 25% die prior to birth

cardiovascular system
• 30% show lethal vascular defects, however outflow tract development is normal
• 95% have abnormal fourth pharyngeal arch artery formation at E10.5
• migration and early differentiation of the 4th pharyngeal arch artery endothelial cells occurs normally but subsequent vascular organization fails such that at the 35-37 somite stage, endothelial cells remain disorganized and fail to form primitive vascular tubes, long after this vessel is patent and pericyte recruitment is under way in controls
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• 12% show bilateral hypoplasia of the 4th pharyngeal arch arteries
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• exhibit an abnormally large third pharyngeal arch artery
• 30% of E18.5 mutants have interrupted aortic arch type B (IAAB)
• 13% exhibit circumflex right aortic arch (RAA) or RAA with right ductus arteriosus
• 46% exhibit coronary artery anomalies, in isolation or associated with other vascular defects
• subclavian artery anomalies
• 80% exhibit retroesophageal right subclavian artery or abnormal subclavian branching associated with other defects

craniofacial
• 100% show severe craniofacial malformations
• 95% have abnormal fourth pharyngeal arch artery formation at E10.5
• migration and early differentiation of the 4th pharyngeal arch artery endothelial cells occurs normally but subsequent vascular organization fails such that at the 35-37 somite stage, endothelial cells remain disorganized and fail to form primitive vascular tubes, long after this vessel is patent and pericyte recruitment is under way in controls
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• 12% show bilateral hypoplasia of the 4th pharyngeal arch arteries
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• exhibit an abnormally large third pharyngeal arch artery
• exhibit severe pharyngeal arch 1 hypoplasia and hypoplasia and fusion of the more caudal pharyngeal arches as early as E9.5

embryo
• 95% have abnormal fourth pharyngeal arch artery formation at E10.5
• migration and early differentiation of the 4th pharyngeal arch artery endothelial cells occurs normally but subsequent vascular organization fails such that at the 35-37 somite stage, endothelial cells remain disorganized and fail to form primitive vascular tubes, long after this vessel is patent and pericyte recruitment is under way in controls
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• 12% show bilateral hypoplasia of the 4th pharyngeal arch arteries
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• exhibit an abnormally large third pharyngeal arch artery
• exhibit an increase in apoptosis of neural crest cells migrating from rhombomeres 6-8
• exhibit severe pharyngeal arch 1 hypoplasia and hypoplasia and fusion of the more caudal pharyngeal arches as early as E9.5

cellular
• exhibit an increase in apoptosis of neural crest cells migrating from rhombomeres 6-8




Genotype
MGI:2686873
cn8
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm2Mrc
Tfap2atm1(cre)Moon/Tfap2a+
Genetic
Background
involves: 129/Sv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Mrc mutation (0 available); any Fgf8 mutation (18 available)
Tfap2atm1(cre)Moon mutation (1 available); any Tfap2a mutation (39 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• those that survive to birth die postnatally due to lethal vascular defects in 30% and severe craniofacial defects in 100% of mutants
• 25% die prior to birth

cardiovascular system
• 30% show lethal vascular defects
• 95% have abnormal fourth pharyngeal arch artery formation at E10.5
• migration and early differentiation of the 4th pharyngeal arch artery endothelial cells occurs normally but subsequent vascular organization fails such that at the 35-37 somite stage, endothelial cells remain disorganized and fail to form primitive vascular tubes, long after this vessel is patent and pericyte recruitment is under way in controls
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• 12% show bilateral hypoplasia of the 4th pharyngeal arch arteries
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• exhibit an abnormally large third pharyngeal arch artery
• 30% of E18.5 mutants have interrupted aortic arch type B (IAAB)
• 13% exhibit circumflex right aortic arch (RAA) or RAA with right ductus arteriosus
• 46% exhibit coronary artery anomalies, in isolation or associated with other vascular defects
• subclavian artery anomalies
• 80% exhibit retroesophageal right subclavian artery or abnormal subclavian branching associated with other defects

craniofacial
• 100% show severe craniofacial malformations
• 95% have abnormal fourth pharyngeal arch artery formation at E10.5
• migration and early differentiation of the 4th pharyngeal arch artery endothelial cells occurs normally but subsequent vascular organization fails such that at the 35-37 somite stage, endothelial cells remain disorganized and fail to form primitive vascular tubes, long after this vessel is patent and pericyte recruitment is under way in controls
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• 12% show bilateral hypoplasia of the 4th pharyngeal arch arteries
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• exhibit an abnormally large third pharyngeal arch artery
• exhibit severe pharyngeal arch 1 hypoplasia and hypoplasia and fusion of the more caudal pharyngeal arches as early as E9.5

embryo
• 95% have abnormal fourth pharyngeal arch artery formation at E10.5
• migration and early differentiation of the 4th pharyngeal arch artery endothelial cells occurs normally but subsequent vascular organization fails such that at the 35-37 somite stage, endothelial cells remain disorganized and fail to form primitive vascular tubes, long after this vessel is patent and pericyte recruitment is under way in controls
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• 12% show bilateral hypoplasia of the 4th pharyngeal arch arteries
• 33% display bilateral aplasia of the fourth and sixth pharyngeal arch arteries at E10.5
• exhibit an abnormally large third pharyngeal arch artery
• exhibit an increase in apoptosis of neural crest cells migrating from rhombomeres 6-8
• exhibit severe pharyngeal arch 1 hypoplasia and hypoplasia and fusion of the more caudal pharyngeal arches as early as E9.5

cellular
• exhibit an increase in apoptosis of neural crest cells migrating from rhombomeres 6-8




Genotype
MGI:2686877
cn9
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm1Moon
Hoxa3tm1(cre)Moon/Hoxa3+
Genetic
Background
involves: 129/Sv * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Moon mutation (1 available); any Fgf8 mutation (18 available)
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Hoxa3tm1(cre)Moon mutation (1 available); any Hoxa3 mutation (24 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• 30% die during the neonatal period because of lethal cardiovascular malformations

cardiovascular system
• exhibit pharyngeal arch artery defects
• defect in vascular tube formation in the fourth pharyngeal arch
• exhibit an abnormally large third pharyngeal arch artery
• only 1 of 33 have severe perturbation of outflow tract septation and alignment (Tetralogy of Fallot and BAV)
• coronary vascular defects
• 23% exhibit bicuspid aortic valves

hematopoietic system
• exhibit thymic hypoplasia, however do not see bilateral thymic aplasia

endocrine/exocrine glands
• parathyroid ectopy, hypoplasia, and aplasia
• exhibit thymic hypoplasia, however do not see bilateral thymic aplasia

immune system
• exhibit thymic hypoplasia, however do not see bilateral thymic aplasia

craniofacial
• exhibit pharyngeal arch artery defects
• defect in vascular tube formation in the fourth pharyngeal arch
• exhibit an abnormally large third pharyngeal arch artery

embryo
• exhibit pharyngeal arch artery defects
• defect in vascular tube formation in the fourth pharyngeal arch
• exhibit an abnormally large third pharyngeal arch artery
• exhibit an increase in apoptosis of neural crest cells migrating from rhomobomeres 6-8

cellular
• exhibit an increase in apoptosis of neural crest cells migrating from rhomobomeres 6-8




Genotype
MGI:3639730
cn10
Allelic
Composition
Fgf8tm2Moon/Fgf8tm1Mrc
Mesp1tm2(cre)Ysa/Mesp1+
Genetic
Background
involves: C57BL/6 * CBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Moon mutation (0 available); any Fgf8 mutation (18 available)
Mesp1tm2(cre)Ysa mutation (1 available); any Mesp1 mutation (17 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• severely affected Fgf8-deficient embryos (65%) die by E10

homeostasis/metabolism
• embryos die by E10 with pericardial effusion in 65% of embryos
• embryos die by E10 with generalized edema in 65% of embryos

cardiovascular system
• OFTs are short or absent in 65% of embryos
• heart tube is hypoplastic in 65% of embryos
• 30% of the embryos born show transposition of the great arteries
• there is a single dilated atrium in 65% of embryos
• there is a single dilated ventricle in 65% of embryos
• 40% of newborns also have a bicuspid aortic valve
• 40% of newborns also have a bicuspid pulmonary valve
• 35% of embryos survive but have small right ventricles at midgestation
• embryos die by E10 with pericardial effusion in 65% of embryos

cellular
• excess apoptotic cells are detected at the 7-9 somite stage in ventral endoderm and adjacent smooth muscle
• at the 4 somite stage, mutants have 46% fewer proliferating cells in crescent mesoderm; this persisted to the 9 somite stage
• proliferating cells are decreased in the proximal outflow tract and pharyngeal epithelium at the 9 somite stage




Genotype
MGI:3639738
cn11
Allelic
Composition
Fgf8tm2Moon/Fgf8tm1Mrc
Tg(Mef2c-cre)2Blk/0
Genetic
Background
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Moon mutation (0 available); any Fgf8 mutation (18 available)
Tg(Mef2c-cre)2Blk mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
cardiovascular system
• 25% of mutants have TGA and double outlet right ventricle
• 25% of mutants have TGA and double outlet right ventricle




Genotype
MGI:3829041
cn12
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm2Moon
Foxa2tm2.1(cre/Esr1*)Moon/Foxa2+
Genetic
Background
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Moon mutation (0 available); any Fgf8 mutation (18 available)
Foxa2tm2.1(cre/Esr1*)Moon mutation (1 available); any Foxa2 mutation (26 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
cardiovascular system
N
• no defects in outflow tract development are seen




Genotype
MGI:2176855
cn13
Allelic
Composition
Fgf8tm1Mrc/Fgf8tm2Mrc
Tg(Rarb-cre)1Mrc/0
Genetic
Background
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf8tm2Mrc mutation (0 available); any Fgf8 mutation (18 available)
Tg(Rarb-cre)1Mrc mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype



Genotype
MGI:3831408
cx14
Allelic
Composition
Fgf8tm1Mrc/Fgf8+
Fgfr3tm1.1Aomw/Fgfr3+
Genetic
Background
involves: 129 * BALB/c * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgfr3tm1.1Aomw mutation (4 available); any Fgfr3 mutation (52 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hearing/vestibular/ear
• increased ABR threshold at all test frequencies




Genotype
MGI:3831411
cx15
Allelic
Composition
Fgf8tm1Mrc/Fgf8+
Fgf9tm1Dor/Fgf9+
Fgfr3tm1.1Aomw/Fgfr3+
Genetic
Background
involves: 129 * BALB/c * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Fgf8tm1Mrc mutation (0 available); any Fgf8 mutation (18 available)
Fgf9tm1Dor mutation (0 available); any Fgf9 mutation (15 available)
Fgfr3tm1.1Aomw mutation (4 available); any Fgfr3 mutation (52 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
hearing/vestibular/ear
• increased ABR threshold at all test frequencies





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)
Citing These Resources
Funding Information
Warranty Disclaimer, Privacy Notice, Licensing, & Copyright
Send questions and comments to User Support.
last database update
04/30/2024
MGI 6.23
The Jackson Laboratory