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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Rr29+
wild type
MGI:5613144
Summary 10 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
Rr29Hx/Rr29+ B10.D2-H2d/nSnJ-Rr29Hx MGI:3711142
ht2
Rr29Hx/Rr29+ B10.D2/nSn-Rr29Hx/J MGI:3051422
ht3
Rr29Hx/Rr29+ C3Fe.Cg-Rr29Hx MGI:3711058
ht4
Rr29Dz/Rr29+ C57BL/6J-Rr29Dz MGI:3851925
ht5
Rr29Dz/Rr29+ (C57BL/6J-Rr29Dz x CAST/Ei)F1 MGI:3851926
ht6
Rr29Hxl3/Rr29+ C57BL/6J-Rr29Hxl3 MGI:3051418
ht7
Rr29rgsc1116/Rr29+ D2;B6-Rr29rgsc1116/Rbrc MGI:3714743
ht8
Rr29Hx/Rr29+ involves: C57BL/10SnJ * DBA/2J MGI:5634906
cx9
Hm/Hm+
Rr29Hx/Rr29+
C3Fe.Cg-Hm +/+ Rr29Hx MGI:3711061
cx10
Rr29tm1.1Bobh/Rr29+
Shhtm1Chg/Shh+
involves: 129P2/OlaHsd * 129S1/Sv * 129X1/SvJ MGI:5613161


Genotype
MGI:3711142
ht1
Allelic
Composition
Rr29Hx/Rr29+
Genetic
Background
B10.D2-H2d/nSnJ-Rr29Hx
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29Hx mutation (1 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• both forefeet have preaxial polydactyly
• the polydactyly in the hind feet arises as a duplication of the terminal phalanx of either the first or fifth toe
• in the forelimbs, one or both or neither radius are foreshortened
• tibias are either absent or greatly reduced in size

skeleton
• in the forelimbs, one or both or neither radius are foreshortened
• tibias are either absent or greatly reduced in size




Genotype
MGI:3051422
ht2
Allelic
Composition
Rr29Hx/Rr29+
Genetic
Background
B10.D2/nSn-Rr29Hx/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29Hx mutation (1 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• zone of polarizing activity is duplicated at anterior margin of fore- and hindlimb buds
• preaxial polydactyly (J:87798)
• supernumerary metacarpals, metatarsals, and digits (J:87798)
• hindlimbs usually more affected than forelimbs (J:87798)
• a III-II-II-III-IV-V digit pattern (J:27442)
• mirror-image duplication of the second and third tarsal bones
• short talus
• hemimelia caused by shortening of the radius, tibia, and talus

skeleton
• mirror-image duplication of the second and third tarsal bones
• short talus

homeostasis/metabolism
• bleeding time is increased 2.6- to 3-fold compared to controls
• platelet numbers and function appear normal

embryo
• zone of polarizing activity is duplicated at anterior margin of fore- and hindlimb buds




Genotype
MGI:3711058
ht3
Allelic
Composition
Rr29Hx/Rr29+
Genetic
Background
C3Fe.Cg-Rr29Hx
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29Hx mutation (1 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Macroscopic pictures of ventral hind limbs and skeletal hind limbs of Rr29Hx/Shh+ , Rr29Hx/Rr29Hx, Hm/+, Hm/Hm, and Hm/+ Rr29Hx/Shh+ mice

limbs/digits/tail
• preaxial polydactyly and normal tibia




Genotype
MGI:3851925
ht4
Allelic
Composition
Rr29Dz/Rr29+
Genetic
Background
C57BL/6J-Rr29Dz
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29Dz mutation (0 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• preaxial polydactyly is seen on the hindlimbs
• Background Sensitivity: limb phenotype is seen in mice on a C57BL/6J background but not in mice crossed to CAST/Ei, no indication of the direction of the cross was provided




Genotype
MGI:3851926
ht5
Allelic
Composition
Rr29Dz/Rr29+
Genetic
Background
(C57BL/6J-Rr29Dz x CAST/Ei)F1
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29Dz mutation (0 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
N
• Background Sensitivity: unlike mice on a C57BL/6J background no limb phenotype is seen in mice crossed to CAST/Ei, no indication of the direction of the cross was provided




Genotype
MGI:3051418
ht6
Allelic
Composition
Rr29Hxl3/Rr29+
Genetic
Background
C57BL/6J-Rr29Hxl3
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29Hxl3 mutation (1 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Skeletal phenotypes of Rr29Hx/Rr29Hx and Rr29Hxl3/Shh+ mice

limbs/digits/tail
• preaxial polydactyly
• supernumerary metacarpals, metatarsals, and digits
• hemimelia caused by shortening of the radius, tibia, and talus
• hindlimbs usually more affected than forelimbs




Genotype
MGI:3714743
ht7
Allelic
Composition
Rr29rgsc1116/Rr29+
Genetic
Background
D2;B6-Rr29rgsc1116/Rbrc
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29rgsc1116 mutation (1 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• 80% preaxial polydactyly at G3




Genotype
MGI:5634906
ht8
Allelic
Composition
Rr29Hx/Rr29+
Genetic
Background
involves: C57BL/10SnJ * DBA/2J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29Hx mutation (1 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• noticeable by E11-E12
• Background Sensitivity: variable penetrance
• occurred in the forepaws
• occurred in the hindpaws only
• tibial and radial

skeleton

mortality/aging
• mice dying during the neonatal period had cleft palate

craniofacial
• cause of death of some newborns

digestive/alimentary system
• cause of death of some newborns

growth/size/body
• cause of death of some newborns




Genotype
MGI:3711061
cx9
Allelic
Composition
Hm/Hm+
Rr29Hx/Rr29+
Genetic
Background
C3Fe.Cg-Hm +/+ Rr29Hx
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Hm mutation (3 available); any Hm mutation (3 available)
Rr29Hx mutation (1 available); any Rr29 mutation (2 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Macroscopic pictures of ventral hind limbs and skeletal hind limbs of Rr29Hx/Shh+ , Rr29Hx/Rr29Hx, Hm/+, Hm/Hm, and Hm/+ Rr29Hx/Shh+ mice

limbs/digits/tail
• preaxial polydactyly with normal tibia
• syndactyly is more severe than seen in single heterozygous Hm mutants
• complete webbing of all hind feet digits that extend to the tip of the distal phalanges




Genotype
MGI:5613161
cx10
Allelic
Composition
Rr29tm1.1Bobh/Rr29+
Shhtm1Chg/Shh+
Genetic
Background
involves: 129P2/OlaHsd * 129S1/Sv * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Rr29tm1.1Bobh mutation (0 available); any Rr29 mutation (2 available)
Shhtm1Chg mutation (2 available); any Shh mutation (48 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
limbs/digits/tail
• range of limb phenotypes similar to mice homozygous for Rr29tm1.1Bobh
• 40% of mice have 4 digits, 30% have 4 phalanges and 3 metatarsels, 10% have 3 digits and 20% have 3 sets of phalanges and 2 metatarsels





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last database update
12/30/2025
MGI 6.24
The Jackson Laboratory