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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Robo3tm1.1Ache
targeted mutation 1.1, Alain Chedotal
MGI:4441335
Summary 4 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
cn1
Dbx1tm2(cre)Apie/Dbx1+
Robo3tm1.1Ache/Robo3tm1.1Ache
involves: 129P2/OlaHsd * 129S2/SvPas * C57BL/6 MGI:4837353
cn2
Ptf1atm1.1(cre)Cvw/Ptf1a+
Robo3tm1.1Ache/Robo3tm1.1Ache
involves: 129S1/Sv * 129S2/SvPas * 129X1/SvJ MGI:4441338
cn3
Egr2tm2(cre)Pch/Egr2+
Robo3tm1.1Ache/Robo3tm1.1Ache
involves: 129S2/SvPas MGI:4441336
cn4
Egr2tm2(cre)Pch/Egr2+
Robo3tm1.1Ache/Robo3tm1.1Ache
Tg(Mnx1-EGFP)#Tmj/0
involves: 129S2/SvPas * C57BL/6 * DBA MGI:4441376


Genotype
MGI:4837353
cn1
Allelic
Composition
Dbx1tm2(cre)Apie/Dbx1+
Robo3tm1.1Ache/Robo3tm1.1Ache
Genetic
Background
involves: 129P2/OlaHsd * 129S2/SvPas * C57BL/6
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Dbx1tm2(cre)Apie mutation (1 available); any Dbx1 mutation (25 available)
Robo3tm1.1Ache mutation (0 available); any Robo3 mutation (71 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• mice do not survive after birth

nervous system
• mice exhibit reduced biocytin stained commissural interneurons in the pre-Botzinger complex compared with wild-type mice
• mice exhibit reduced biocytin stained commissural interneurons in the pre-Botzinger complex compared with wild-type mice
• mice exhibit de-synchronization of rhythmic activity in the left and right pre-Botzinger complex compared with wild-type mice




Genotype
MGI:4441338
cn2
Allelic
Composition
Ptf1atm1.1(cre)Cvw/Ptf1a+
Robo3tm1.1Ache/Robo3tm1.1Ache
Genetic
Background
involves: 129S1/Sv * 129S2/SvPas * 129X1/SvJ
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Ptf1atm1.1(cre)Cvw mutation (1 available); any Ptf1a mutation (30 available)
Robo3tm1.1Ache mutation (0 available); any Robo3 mutation (71 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Ataxic gait in Robo3tm1.1Ache/Robo3tm1.1Ache Ptf1atm1.1(cre)Cvw/Ptf1a+ mice

nervous system
• severe impairment of the interolivary commissure
• only about 1/3 of inferior olivary neurons project contralaterally compared to wild-type controls where all neurons project contralaterally

behavior/neurological
• in an Erasmus ladder test step time and overall walking pattern are severely abnormal
• impairment is more severe than that of Grid2Lc mice
• severe
• decrease in latency to fall of a rotarod
• impairment is more severe than that of Grid2Lc mice




Genotype
MGI:4441336
cn3
Allelic
Composition
Egr2tm2(cre)Pch/Egr2+
Robo3tm1.1Ache/Robo3tm1.1Ache
Genetic
Background
involves: 129S2/SvPas
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Egr2tm2(cre)Pch mutation (2 available); any Egr2 mutation (31 available)
Robo3tm1.1Ache mutation (0 available); any Robo3 mutation (71 available)
phenotype observed in females
phenotype observed in males
N normal phenotype

Reduced internuclear commissure in Robo3tm1.1Ache/Robo3tm1.1Ache Egr2tm2(cre)Pch/Egr2+ mice

nervous system
• at E11 - E12, a severe reduction of commissural projections in r3 and r5 is seen
• at E15 and in newborns, virtually no axons are found to cross the midline at the level of the abducens nuclei
• globular bushy cell projections from the anteroventral cochlear nucleus to the principal cells of the median nucleus of the trapezoid body are exclusively ipsilateral

behavior/neurological
• impairment in horizontal visual vestibuloocular reflex (VVOR) but not in vertical VVOR
• impairment in horizontal OKR but not in vertical OKR
• defects occur predominantly in the low frequency range
• impairment in horizontal VOR but not in vertical VOR
• defects in VOR are more predominant at high frequencies

hearing/vestibular/ear
• impairment in horizontal VOR but not in vertical VOR
• defects in VOR are more predominant at high frequencies
• 3 rather than 4 waves are present ipsilaterally and the third wave has a longer latency and is not followed by any identifiable wave
• the appearance of contralateral wave IVc is delayed compared to controls




Genotype
MGI:4441376
cn4
Allelic
Composition
Egr2tm2(cre)Pch/Egr2+
Robo3tm1.1Ache/Robo3tm1.1Ache
Tg(Mnx1-EGFP)#Tmj/0
Genetic
Background
involves: 129S2/SvPas * C57BL/6 * DBA
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Egr2tm2(cre)Pch mutation (2 available); any Egr2 mutation (31 available)
Robo3tm1.1Ache mutation (0 available); any Robo3 mutation (71 available)
Tg(Mnx1-EGFP)#Tmj mutation (0 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
nervous system
• at E14, the abducens motor nucleus is closer to the floor plate and abnormally shaped





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last database update
04/30/2024
MGI 6.23
The Jackson Laboratory