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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Hoxb5tm1Mrc
targeted mutation 1, Mario R Capecchi
MGI:2151484
Summary 4 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Hoxb5tm1Mrc/Hoxb5tm1Mrc involves: 129S7/SvEvBrd MGI:2673167
cx2
Hoxb5tm1Mrc/Hoxb5+
Hoxb6tm1Mrc/Hoxb6+
involves: 129S7/SvEvBrd MGI:3611769
cx3
Hoxa5tm1Rob/Hoxa5tm1Rob
Hoxb5tm1Mrc/Hoxb5tm1Mrc
Hoxc5tm1Mrc/Hoxc5tm1Mrc
involves: 129S/SvEv * 129S7/SvEvBrd MGI:4358348
cx4
Hoxa5tm1Rob/Hoxa5+
Hoxa6tm1Mrc/Hoxa6+
Hoxb5tm1Mrc/Hoxb5+
Hoxb6tm1Mrc/Hoxb6+
Hoxc5tm1Mrc/Hoxc5+
Hoxc6tm1Dds/Hoxc6+
involves: 129S/SvEv * 129S7/SvEvBrd MGI:4358354


Genotype
MGI:2673167
hm1
Allelic
Composition
Hoxb5tm1Mrc/Hoxb5tm1Mrc
Genetic
Background
involves: 129S7/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Hoxb5tm1Mrc mutation (0 available); any Hoxb5 mutation (12 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• forelimbs shifted anteriorly relative to the axial skeleton
• shift of limbs sometimes is unilateral
• rostral edge of the scapula aligns with C3 or C4 rather than C5
• altered lateral processes on T1
• T1 to C7 transformation the most prevalent vertebral abnormality
• C7 to C6 transformation
• tuberculum anterior of C6 either shifted to C7 (C6 to C5 transformation) or duplicated there

nervous system
• brachial plexus enters the forelimb at a more posterior position than in controls




Genotype
MGI:3611769
cx2
Allelic
Composition
Hoxb5tm1Mrc/Hoxb5+
Hoxb6tm1Mrc/Hoxb6+
Genetic
Background
involves: 129S7/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Hoxb5tm1Mrc mutation (0 available); any Hoxb5 mutation (12 available)
Hoxb6tm1Mrc mutation (0 available); any Hoxb6 mutation (14 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• T1 to C7 transformation frequent
• C6 to C5 and/or C7 to C6 transformation in 52% of double heterozygotes
• occurs in the absence of T1 to C7 transformations




Genotype
MGI:4358348
cx3
Allelic
Composition
Hoxa5tm1Rob/Hoxa5tm1Rob
Hoxb5tm1Mrc/Hoxb5tm1Mrc
Hoxc5tm1Mrc/Hoxc5tm1Mrc
Genetic
Background
involves: 129S/SvEv * 129S7/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Hoxa5tm1Rob mutation (1 available); any Hoxa5 mutation (27 available)
Hoxb5tm1Mrc mutation (0 available); any Hoxb5 mutation (12 available)
Hoxc5tm1Mrc mutation (0 available); any Hoxc5 mutation (12 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• the clavicles are attached to the rib cage by connective tissue and do not articulate directly with it unlike in wild-type mice
• a eighth rib is attached to the sternum unlike in wild-type mice
• T1 ribs exhibit incomplete projection and T2 ribs extend but often do not reach the sternum (in 64% of mice)
• however, rib attachment posterior to T1 is normal
• ribs initiate but do not extend on T1 unlike in wild-type mice
• mice are missing a complete first rib
• rib 2 and 3 are fused prior to attachment to the sternum
• dorsal cartilage is thickened and forms a distinct curvature at the top of the vertebra unlike in wild-type mice
• C3 through T2 exhibit anterior homeotic transformations
• C3 through T1 exhibit characteristics of C2
• however, posterior thoracic, lumbar, and sacral vertebrae are normal in appearance and position
• C3 through T1 exhibit characteristics of C2
• T2 lacks anterior projections and is similar to T3
• ibs do not extend on T1 unlike in wild-type mice
• C3 through T1 exhibit characteristics of C2
• vertebral foramina extend beyond C6 to C7 unlike in wild-type mice




Genotype
MGI:4358354
cx4
Allelic
Composition
Hoxa5tm1Rob/Hoxa5+
Hoxa6tm1Mrc/Hoxa6+
Hoxb5tm1Mrc/Hoxb5+
Hoxb6tm1Mrc/Hoxb6+
Hoxc5tm1Mrc/Hoxc5+
Hoxc6tm1Dds/Hoxc6+
Genetic
Background
involves: 129S/SvEv * 129S7/SvEvBrd
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Hoxa5tm1Rob mutation (1 available); any Hoxa5 mutation (27 available)
Hoxa6tm1Mrc mutation (0 available); any Hoxa6 mutation (9 available)
Hoxb5tm1Mrc mutation (0 available); any Hoxb5 mutation (12 available)
Hoxb6tm1Mrc mutation (0 available); any Hoxb6 mutation (14 available)
Hoxc5tm1Mrc mutation (0 available); any Hoxc5 mutation (12 available)
Hoxc6tm1Dds mutation (0 available); any Hoxc6 mutation (11 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
skeleton
• primaxial and abaxial skeleton defects are less severe than in either triple homozygote





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last database update
04/23/2024
MGI 6.23
The Jackson Laboratory