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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Alx4+
wild type
MGI:1857474
Summary 12 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
Alx4M1Yzcm/Alx4+ C57BL/6-Alx4M1Yzcm MGI:5502882
ht2
Alx4Lst-2J/Alx4+ C57BL/6J-Alx4Lst-2J/J MGI:5695544
ht3
Alx4tm1Rwi/Alx4+ involves: 129S6/SvEvTac MGI:3050639
ht4
Alx4tm1Rwi/Alx4+ involves: 129S6/SvEvTac * C57BL/6J MGI:3050643
ht5
Alx4lst-Alb/Alx4+ involves: C3H/HeJ * C57BL/6 MGI:5140813
cx6
Alx4tm1Rwi/Alx4+
Bmp4tm1Blh/Bmp4+
involves: 129S2/SvPas * 129S6/SvEvTac * C57BL/6 MGI:2166749
cx7
Alx1tm1Crm/Alx1tm1Crm
Alx4tm1Rwi/Alx4+
involves: 129S6/SvEvTac * 129S7/SvEvBrd MGI:3050585
cx8
Alx1tm1Crm/Alx1+
Alx4tm1Rwi/Alx4+
involves: 129S6/SvEvTac * 129S7/SvEvBrd MGI:3050576
cx9
Alx4lst/Alx4+
Fmn1ld-TgHD/Fmn1+
involves: BALB/c * C57BL/6 * CD-1 * FVB/N MGI:4355955
cx10
Alx1em1Jian/Alx1em1Jian
Alx4Lst-2J/Alx4+
involves: C57BL/6J * C57BL/6N * CD-1 MGI:7336700
cx11
Alx4lst/Alx4+
Grem1ld-J/Grem1+
involves: CBA/Ca * NHO MGI:4355958
cx12
Alx4lst/Alx4+
Grem1ld/Grem1+
Not Specified MGI:4355956


Genotype
MGI:5502882
ht1
Allelic
Composition
Alx4M1Yzcm/Alx4+
Genetic
Background
C57BL/6-Alx4M1Yzcm
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4M1Yzcm mutation (0 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• in one hindlimb, rarely in both




Genotype
MGI:5695544
ht2
Allelic
Composition
Alx4Lst-2J/Alx4+
Genetic
Background
C57BL/6J-Alx4Lst-2J/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4Lst-2J mutation (1 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• preaxial polydactyly on one hind limb is often found

craniofacial

growth/size/body




Genotype
MGI:3050639
ht3
Allelic
Composition
Alx4tm1Rwi/Alx4+
Genetic
Background
involves: 129S6/SvEvTac
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4tm1Rwi mutation (0 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
normal phenotype
• heterozygotes are apparently normal and do NOT display polydactyly




Genotype
MGI:3050643
ht4
Allelic
Composition
Alx4tm1Rwi/Alx4+
Genetic
Background
involves: 129S6/SvEvTac * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4tm1Rwi mutation (0 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• notably, heterozygous F1 progeny of a 129/Sv x C57BL/6J mating display hindlimb polydactyly




Genotype
MGI:5140813
ht5
Allelic
Composition
Alx4lst-Alb/Alx4+
Genetic
Background
involves: C3H/HeJ * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4lst-Alb mutation (0 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• Background Sensitivity: penetrance is sensitive to genetic background
• Background Sensitivity: found on the hindlimbs of this genotypic background but not on a 129/Sv background
• C57BL/6 is a permissive background




Genotype
MGI:2166749
cx6
Allelic
Composition
Alx4tm1Rwi/Alx4+
Bmp4tm1Blh/Bmp4+
Genetic
Background
involves: 129S2/SvPas * 129S6/SvEvTac * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4tm1Rwi mutation (0 available); any Alx4 mutation (21 available)
Bmp4tm1Blh mutation (2 available); any Bmp4 mutation (23 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• all double heterozygotes exhibit ectopic anterior digits only on the hindlimbs
• extra digit extends from a duplicated metatarsal
• extra digits are triphalangeal
• post axial "nubbins" also seen on the forelimbs of 80% of heterozygotes




Genotype
MGI:3050585
cx7
Allelic
Composition
Alx1tm1Crm/Alx1tm1Crm
Alx4tm1Rwi/Alx4+
Genetic
Background
involves: 129S6/SvEvTac * 129S7/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx1tm1Crm mutation (0 available); any Alx1 mutation (22 available)
Alx4tm1Rwi mutation (0 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
• mandibular reduction is mainly restricted to the region anterior to the alveolar process that surrounds the molars
• mutants that carry three mutant alleles in any combination show cleft face associated with failure to fuse the cartilages of the nasal septum
• mutant mice show a midline fusion defect that results in cleft face

respiratory system
• mutants that carry three mutant alleles in any combination show cleft face associated with failure to fuse the cartilages of the nasal septum

skeleton
• mandibular reduction is mainly restricted to the region anterior to the alveolar process that surrounds the molars
• mutants that carry three mutant alleles in any combination show cleft face associated with failure to fuse the cartilages of the nasal septum

nervous system
• all double homozygous null mice display exencephaly

growth/size/body
• mandibular reduction is mainly restricted to the region anterior to the alveolar process that surrounds the molars
• mutants that carry three mutant alleles in any combination show cleft face associated with failure to fuse the cartilages of the nasal septum
• mutant mice show a midline fusion defect that results in cleft face




Genotype
MGI:3050576
cx8
Allelic
Composition
Alx1tm1Crm/Alx1+
Alx4tm1Rwi/Alx4+
Genetic
Background
involves: 129S6/SvEvTac * 129S7/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx1tm1Crm mutation (0 available); any Alx1 mutation (22 available)
Alx4tm1Rwi mutation (0 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
normal phenotype
• double heterozygotes appear phenotypically normal




Genotype
MGI:4355955
cx9
Allelic
Composition
Alx4lst/Alx4+
Fmn1ld-TgHD/Fmn1+
Genetic
Background
involves: BALB/c * C57BL/6 * CD-1 * FVB/N
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4lst mutation (0 available); any Alx4 mutation (21 available)
Fmn1ld-TgHD mutation (0 available); any Fmn1 mutation (73 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
N
• have normal limbs




Genotype
MGI:7336700
cx10
Allelic
Composition
Alx1em1Jian/Alx1em1Jian
Alx4Lst-2J/Alx4+
Genetic
Background
involves: C57BL/6J * C57BL/6N * CD-1
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx1em1Jian mutation (0 available); any Alx1 mutation (22 available)
Alx4Lst-2J mutation (1 available); any Alx4 mutation (21 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
craniofacial
• at E18.5, the presphenoid bone in the cranial base is severely malformed
• at E18.5, the premaxilla is severely malformed
• at E10.5, a clear reduction of Pax7 expression is observed in the caudal region of the lateral nasal process (LNP); both Lhx6 and Lhx8 mRNAs show higher ectopic expression in the caudal region of the LNP than in Alx1em1Jian homozygotes
• at E18.5, severe notching of the upper lip is observed
• at E18.5, the philtrum is further shortened relative to Alx1em1Jian homozygotes
• at E18.5, the nasal bridge is severely widened
• at E18.5, the nasal bridge is severely depressed

growth/size/body
• at E18.5, the premaxilla is severely malformed
• at E18.5, severe notching of the upper lip is observed
• at E18.5, the philtrum is further shortened relative to Alx1em1Jian homozygotes
• at E18.5, the nasal bridge is severely widened
• at E18.5, the nasal bridge is severely depressed

skeleton
• at E18.5, the presphenoid bone in the cranial base is severely malformed
• at E18.5, the premaxilla is severely malformed

respiratory system
• at E18.5, the nasal bridge is severely widened
• at E18.5, the nasal bridge is severely depressed




Genotype
MGI:4355958
cx11
Allelic
Composition
Alx4lst/Alx4+
Grem1ld-J/Grem1+
Genetic
Background
involves: CBA/Ca * NHO
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4lst mutation (0 available); any Alx4 mutation (21 available)
Grem1ld-J mutation (1 available); any Grem1 mutation (19 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
N
• have normal limbs




Genotype
MGI:4355956
cx12
Allelic
Composition
Alx4lst/Alx4+
Grem1ld/Grem1+
Genetic
Background
Not Specified
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Alx4lst mutation (0 available); any Alx4 mutation (21 available)
Grem1ld mutation (0 available); any Grem1 mutation (19 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
N
• have normal limbs





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last database update
01/06/2026
MGI 6.24
The Jackson Laboratory