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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Sp8tm1Smb
targeted mutation 1, Sheila M Bell
MGI:2684070
Summary 11 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Sp8tm1Smb/Sp8tm1Smb involves: 129S1/Sv * 129X1/SvJ MGI:2684122
cn2
Sp8tm1Smb/Sp8tm2Smb
Foxg1tm1(cre)Skm/Foxg1+
involves: 129P2/OlaHsd * 129S1/Sv * 129X1/SvJ MGI:7437676
cn3
Gt(ROSA)26Sortm2Sho/Gt(ROSA)26Sor+
Sp8tm1Smb/Sp8tm1Smb
H2az2Tg(Wnt1-cre)11Rth/H2az2+
involves: 129S1/Sv * 129S4/SvJaeSor * 129X1/SvJ * C57BL/6J * CBA/J MGI:7355998
cn4
Sp8tm1Smb/Sp8tm2Smb
Pax3tm1(cre)Joe/Pax3+
involves: 129S1/Sv * 129X1/SvJ MGI:7437668
cn5
Sp8tm1Smb/Sp8tm1Smb
Shhtm1(EGFP/cre)Cjt/Shh+
involves: 129S1/Sv * 129X1/SvJ MGI:7437679
cn6
Gt(ROSA)26Sortm2(Sp8)Lma/Gt(ROSA)26Sor+
Sp8tm1Smb/Sp8tm1Smb
Tg(Msx2-cre)5Rem/0
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * CBA MGI:5694217
cn7
Ctnnb1tm1Mmt/Ctnnb1tm1Mmt
Sp8tm1Smb/Sp8tm1Smb
Tg(Msx2-cre)5Rem/0
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * CBA MGI:5694218
cn8
Sp8tm1Smb/Sp8tm1Smb
Tg(Msx2-cre)5Rem/0
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * CBA MGI:5694216
cn9
Sp8tm1Smb/Sp8tm2Smb
H2az2Tg(Wnt1-cre)11Rth/H2az2+
involves: 129S1/Sv * 129X1/SvJ * C57BL/6J * CBA/J MGI:7437666
cn10
Sp8tm1Smb/Sp8tm2Smb
Mesp1tm2(cre)Ysa/Mesp1+
involves: 129S1/Sv * 129X1/SvJ * C57BL/6NCrlj * CBA/JNCrlj MGI:7437667
cx11
lgl/lgl+
Sp8tm1Smb/Sp8+
involves: 129S1/Sv * 129X1/SvJ * C3H * C57BL/6 MGI:2684127


Genotype
MGI:2684122
hm1
Allelic
Composition
Sp8tm1Smb/Sp8tm1Smb
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
embryo
• impaired posterior neuropore closure
• impaired anterior neuropore closure (J:86196)
• at E9.5, embryos show failure of anterior neuropore closure (J:200761)
• observed in all fetuses

nervous system
• impaired posterior neuropore closure
• impaired anterior neuropore closure (J:86196)
• at E9.5, embryos show failure of anterior neuropore closure (J:200761)
• observed in all fetuses
• observed in nearly all fetuses (J:86196)
• enecephalocoeles were not observed (J:86196)
• at E18.5, a large hole is noted between the residual frontal and parietal bones, where exencephalic brain is exposed (J:200761)
• after embryonic exposure to 150 mg/kg cyclopamine (an SHH signaling inhibitor), approximately one third of cyclopamine-treated embryos show a partial rescue of the exencephaly phenotype (J:200761)

limbs/digits/tail
• the radius and distal bones were absent
• truncated ulna
• normal formation of the humerus
• distally truncated
• lacked structures distal to femur
• complete absence of the tail

skeleton
• at E18.5, the frontal bone is absent or reduced in size and misshapen
• at E18.5
• at E18.5, the interparietal bone is absent or reduced in size and misshapen
• at E18.5, the supraoccipital bone is reduced in size and misshapen
• at E18.5, the parietal bone is absent or reduced in size and misshapen
• at E18.5, the maxilla is reduced in size and misshapen
• at E18.5, the premaxilla is reduced in size and misshapen
• distally truncated
• abnormal and disorganized lumbar vertebrae

craniofacial
• at E18.5, the frontal bone is absent or reduced in size and misshapen
• at E18.5
• at E18.5, the interparietal bone is absent or reduced in size and misshapen
• at E18.5, the supraoccipital bone is reduced in size and misshapen
• at E18.5, the parietal bone is absent or reduced in size and misshapen
• at E18.5, the maxilla is reduced in size and misshapen
• at E18.5, the premaxilla is reduced in size and misshapen
• at E14.5, embryos display severe midline defects and absence of many normal facial structures
• at E10.5, E11.5 and E12.5, all facial prominences are formed but the medial nasal prominences (MNP) and lateral nasal prominences (LNP) are severely reduced in size and underdeveloped
• at E18.5, all neural crest (NC)-derived bones are absent or reduced in size and misshapen, while paraxial mesoderm-derived parietal and interparietal bones are absent
• at E10.5, E11.5 and E12.5, the LNP are severely reduced in size and underdeveloped
• at E14.5, the LNP are of normal size but fail to undergo normal development
• at E14.5, maxillary prominences (MXP) are of normal size but fail to undergo normal development
• at E10.5, E11.5 and E12.5, the MNP are severely reduced in size and underdeveloped
• at E14.5, the MNP remain severely underdeveloped and are not merged with other facial elements
• palatal shelves fail to fuse along the midline even at E16.5
• palatal shelves are reduced in size
• at E14.5, the MNP are severely underdeveloped whereas the LNP and MXP are of normal size but fail to undergo normal development, resulting in an almost faceless phenotype, typical of much younger embryos
• after embryonic exposure to 150 mg/kg cyclopamine (an SHH signaling inhibitor), approximately one third of cyclopamine-treated embryos show a more normal looking face, with improved midfacial development, although the MNPs remain distinct
• at E14.5, palatal shelves are prematurely elevated above the tongue
• at E14.5, severe failure of midline fusion and loss of many facial structures are observed
• after embryonic exposure to 150 mg/kg cyclopamine (an SHH signaling inhibitor), approximately one third of cyclopamine-treated embryos show a partial rescue of the midline defects

growth/size/body
• palatal shelves fail to fuse along the midline even at E16.5
• palatal shelves are reduced in size
• at E14.5, the MNP are severely underdeveloped whereas the LNP and MXP are of normal size but fail to undergo normal development, resulting in an almost faceless phenotype, typical of much younger embryos
• after embryonic exposure to 150 mg/kg cyclopamine (an SHH signaling inhibitor), approximately one third of cyclopamine-treated embryos show a more normal looking face, with improved midfacial development, although the MNPs remain distinct
• at E14.5, palatal shelves are prematurely elevated above the tongue
• at E14.5, severe failure of midline fusion and loss of many facial structures are observed
• after embryonic exposure to 150 mg/kg cyclopamine (an SHH signaling inhibitor), approximately one third of cyclopamine-treated embryos show a partial rescue of the midline defects

reproductive system
• absent in 14 of 36 mice between E12.5 and E15.5
• remaining mice exhibit a range of defects including deformation, hypoplasia and proximal hypospadias

renal/urinary system
• in some mice

vision/eye
• embryos display hypertelorism at E14.5
• after embryonic exposure to 150 mg/kg cyclopamine (an SHH signaling inhibitor), approximately one third of cyclopamine-treated embryos show a partial rescue of the hypertelorism phenotype

digestive/alimentary system
• palatal shelves fail to fuse along the midline even at E16.5
• palatal shelves are reduced in size
• at E14.5, palatal shelves are prematurely elevated above the tongue




Genotype
MGI:7437676
cn2
Allelic
Composition
Sp8tm1Smb/Sp8tm2Smb
Foxg1tm1(cre)Skm/Foxg1+
Genetic
Background
involves: 129P2/OlaHsd * 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Foxg1tm1(cre)Skm mutation (2 available); any Foxg1 mutation (29 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
Sp8tm2Smb mutation (1 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
• all (13 of 13) mice exhibited truncation of anterior facial structures
• 5 of 13 mice exhibited cleft lip and/or palate
• 5 of 13 mice exhibited cleft lip and/or palate
• all (13 of 13) mice showed incomplete medial nasal prominence approximation along the facial midline, resulting in a facial midline cleft

nervous system
• mice exhibited malformations of the telencephalon
• only 1 of 13 mice exhibited exencephaly

growth/size/body
• all (13 of 13) mice exhibited truncation of anterior facial structures
• 5 of 13 mice exhibited cleft lip and/or palate
• 5 of 13 mice exhibited cleft lip and/or palate
• all (13 of 13) mice showed incomplete medial nasal prominence approximation along the facial midline, resulting in a facial midline cleft

digestive/alimentary system
• 5 of 13 mice exhibited cleft lip and/or palate

vision/eye
N
• none of the 13 mice analyzed showed ocular hypertelorism




Genotype
MGI:7355998
cn3
Allelic
Composition
Gt(ROSA)26Sortm2Sho/Gt(ROSA)26Sor+
Sp8tm1Smb/Sp8tm1Smb
H2az2Tg(Wnt1-cre)11Rth/H2az2+
Genetic
Background
involves: 129S1/Sv * 129S4/SvJaeSor * 129X1/SvJ * C57BL/6J * CBA/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Gt(ROSA)26Sortm2Sho mutation (2 available); any Gt(ROSA)26Sor mutation (993 available)
H2az2Tg(Wnt1-cre)11Rth mutation (2 available); any H2az2 mutation (26 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
embryo
• at E9.5, a 4-fold increase in apoptosis is detected in the neural crest cells (NCCs) of the facial mesenchyme
• at E10.5, apoptosis is significantly increased in both the medial nasal prominences (MNP) and lateral nasal prominences (LNP) and the olfactory pit
• at E9.5, a 4-fold increase in apoptosis is detected in the neural crest cells (NCCs) of the facial mesenchyme
• at E10.5, apoptosis is significantly increased in both the medial nasal prominences (MNP) and lateral nasal prominences (LNP) and the olfactory pit
• at E9.5, but not at E8.5, NCC proliferation is significantly reduced in the facial mesenchyme
• at E10.5, cell proliferation is significantly reduced in the olfactory pit and the lateral nasal prominences (LNP), but not in the medial nasal prominences (MNP)

nervous system
• at E8.5, a 3-fold increase in apoptosis is detected in the anterior neuroepithelium of the cranial neural folds, including the anterior neural ridge (ANR); however, no elevated apoptosis is observed in the neural crest cells (NCCs) at this age

cellular
• at E9.5, a 4-fold increase in apoptosis is detected in the neural crest cells (NCCs) of the facial mesenchyme
• at E10.5, apoptosis is significantly increased in both the medial nasal prominences (MNP) and lateral nasal prominences (LNP) and the olfactory pit
• at E9.5, a 4-fold increase in apoptosis is detected in the neural crest cells (NCCs) of the facial mesenchyme
• at E10.5, apoptosis is significantly increased in both the medial nasal prominences (MNP) and lateral nasal prominences (LNP) and the olfactory pit
• at E8.5, a 3-fold increase in apoptosis is detected in the anterior neuroepithelium of the cranial neural folds, including the anterior neural ridge (ANR); however, no elevated apoptosis is observed in the neural crest cells (NCCs) at this age
• at E9.5, but not at E8.5, NCC proliferation is significantly reduced in the facial mesenchyme
• at E10.5, cell proliferation is significantly reduced in the olfactory pit and the lateral nasal prominences (LNP), but not in the medial nasal prominences (MNP)

craniofacial
• at E10.5, apoptosis is significantly increased whereas cell proliferation is significantly reduced in the olfactory pit

growth/size/body
• at E9.5, a 4-fold increase in apoptosis is detected in the neural crest cells (NCCs) of the facial mesenchyme
• at E10.5, apoptosis is significantly increased in both the medial nasal prominences (MNP) and lateral nasal prominences (LNP) and the olfactory pit

respiratory system
• at E10.5, apoptosis is significantly increased whereas cell proliferation is significantly reduced in the olfactory pit




Genotype
MGI:7437668
cn4
Allelic
Composition
Sp8tm1Smb/Sp8tm2Smb
Pax3tm1(cre)Joe/Pax3+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Pax3tm1(cre)Joe mutation (1 available); any Pax3 mutation (50 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
Sp8tm2Smb mutation (1 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
N
• 5 of 17 mice exhibited no detectable craniofacial defects
• 5 of 17 mice exhibited absence of the frontal bone
• 5 of 17 mice exhibited absence of the parietal bones
• 11 of 17 mice exhibited truncation of anterior facial (snout) structures
• 7 of 17 mice exhibited cleft lip and/or palate
• 7 of 17 mice exhibited cleft lip and/or palate
• 5 of 17 mice exhibited a severe midline cleft
• 7 of 17 mice exhibited moderate midline defects

growth/size/body
• 11 of 17 mice exhibited truncation of anterior facial (snout) structures
• 7 of 17 mice exhibited cleft lip and/or palate
• 7 of 17 mice exhibited cleft lip and/or palate
• 5 of 17 mice exhibited a severe midline cleft
• 7 of 17 mice exhibited moderate midline defects

nervous system
• 5 of 17 mice exhibited exencephaly

vision/eye
• 5 of 17 mice exhibited hypertelorism

digestive/alimentary system
• 7 of 17 mice exhibited cleft lip and/or palate

skeleton
• 5 of 17 mice exhibited absence of the frontal bone
• 5 of 17 mice exhibited absence of the parietal bones




Genotype
MGI:7437679
cn5
Allelic
Composition
Sp8tm1Smb/Sp8tm1Smb
Shhtm1(EGFP/cre)Cjt/Shh+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Shhtm1(EGFP/cre)Cjt mutation (1 available); any Shh mutation (48 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
N
• mice show partial craniofacial rescue of anterior structures; the medial facial prominences partially merge with the lateral and maxillary prominences to form an identifiable snout by E18.5
• despite partial rescue of anterior structures, the more dorsal structures of the skull and forehead are not rescued

vision/eye
• mice display an inner canthal distance of 5.33 mm +/- 0.26 mm relative to 4.4 mm +/- 0.09 mm for wild-type controls and 6.1 mm +/- 0.45 mm for Sp8tm1Smb homozygotes with two wild-type Shh alleles, indicating partial rescue of the hypertelorism phenotype




Genotype
MGI:5694217
cn6
Allelic
Composition
Gt(ROSA)26Sortm2(Sp8)Lma/Gt(ROSA)26Sor+
Sp8tm1Smb/Sp8tm1Smb
Tg(Msx2-cre)5Rem/0
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * CBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Gt(ROSA)26Sortm2(Sp8)Lma mutation (0 available); any Gt(ROSA)26Sor mutation (993 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
Tg(Msx2-cre)5Rem mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail




Genotype
MGI:5694218
cn7
Allelic
Composition
Ctnnb1tm1Mmt/Ctnnb1tm1Mmt
Sp8tm1Smb/Sp8tm1Smb
Tg(Msx2-cre)5Rem/0
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * CBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ctnnb1tm1Mmt mutation (0 available); any Ctnnb1 mutation (49 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
Tg(Msx2-cre)5Rem mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
N
• polysyndactyly and ectopic limb phenotypes are rescued




Genotype
MGI:5694216
cn8
Allelic
Composition
Sp8tm1Smb/Sp8tm1Smb
Tg(Msx2-cre)5Rem/0
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6 * CBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
Tg(Msx2-cre)5Rem mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• loss of distal structures
• however, stylopod and zeugopod develop normally in the forelimbs
• only one abnormal digit forms
• missing or severely truncated
• missing or severely truncated
• missing or severely truncated
• missing or severely truncated

skeleton
• missing or severely truncated
• missing or severely truncated
• missing or severely truncated
• missing or severely truncated




Genotype
MGI:7437666
cn9
Allelic
Composition
Sp8tm1Smb/Sp8tm2Smb
H2az2Tg(Wnt1-cre)11Rth/H2az2+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6J * CBA/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
H2az2Tg(Wnt1-cre)11Rth mutation (2 available); any H2az2 mutation (26 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
Sp8tm2Smb mutation (1 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
N
• mice exhibit no detectable craniofacial defects




Genotype
MGI:7437667
cn10
Allelic
Composition
Sp8tm1Smb/Sp8tm2Smb
Mesp1tm2(cre)Ysa/Mesp1+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C57BL/6NCrlj * CBA/JNCrlj
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Mesp1tm2(cre)Ysa mutation (3 available); any Mesp1 mutation (18 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
Sp8tm2Smb mutation (1 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
N
• 9 of 10 mice exhibited no detectable craniofacial defects
• 1 of 10 mice showed truncation of anterior facial structures
• 1 of 10 mice showed incomplete medial nasal prominence approximation along the facial midline, resulting in a partial facial midline cleft

growth/size/body
• 1 of 10 mice showed truncation of anterior facial structures
• 1 of 10 mice showed incomplete medial nasal prominence approximation along the facial midline, resulting in a partial facial midline cleft




Genotype
MGI:2684127
cx11
Allelic
Composition
lgl/lgl+
Sp8tm1Smb/Sp8+
Genetic
Background
involves: 129S1/Sv * 129X1/SvJ * C3H * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
lgl mutation (0 available); any lgl mutation (0 available)
Sp8tm1Smb mutation (0 available); any Sp8 mutation (29 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• die within 24 hours of birth

craniofacial

limbs/digits/tail
• abnormal radius and ulna
• absence of distal bones
• normal formation of the humerus
• dysplastic radius
• distally truncated
• lacked structures distal to femur
• exhibited by 85%
• fusion of tail vertebrae

skeleton
• dysplastic radius
• distally truncated
• fusion of tail vertebrae

nervous system
• anterior neural tube closure defects exhibited by 85% of fetuses
• exhibited by 59%
• encephaloceles observed in 26%

embryo
• anterior neural tube closure defects exhibited by 85% of fetuses





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