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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
Lse
low set ears
MGI:1861623
Summary 3 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
hm1
Lse/Lse B6C3Fe a/a-Lse/J MGI:3783755
ht2
Lse/Lse+ B6C3Fe a/a-Lse/J MGI:3783751
cx3
Lse/Lse+
Twist1tm1Bhr/Twist1+
involves: 129S7/SvEvBrd * C3H/HeJ * C57BL/6J MGI:7705898


Genotype
MGI:3783755
hm1
Allelic
Composition
Lse/Lse
Genetic
Background
B6C3Fe a/a-Lse/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Lse mutation (1 available); any Lse mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
• homozygotes either die in utero or have the same phenotype as heterozygotes

craniofacial
N
• no obvious suture defects
• at E17.5 and E18.5
• visible at E13.5 and E17.5
• reduced outer ear development at E17.5

hearing/vestibular/ear
• visible at E13.5 and E17.5
• reduced outer ear development at E17.5
• extremely hypomorphic and anteriorly shifted at E18.5

vision/eye

limbs/digits/tail
• forelimb and hindlimb polydactyly

digestive/alimentary system
• at E17.5 and E18.5

growth/size/body
• at E17.5 and E18.5
• visible at E13.5 and E17.5
• reduced outer ear development at E17.5




Genotype
MGI:3783751
ht2
Allelic
Composition
Lse/Lse+
Genetic
Background
B6C3Fe a/a-Lse/J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Lse mutation (1 available); any Lse mutation (1 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging
N
• normal lifespan on a mixed C57BL/6J;C3H/FeJ F1 background
• 50% of heterozygotes do not survive to weaning
• the number of heterozygotes born is less than the expected ratio

craniofacial
• hypoplastic paraoccipital process in 9 of 11 mice
• slightly hypoplastic at E18.5
• abnormal low-set position of primitive pinna is first observed at E13
• rather than fusing, the lower end of the pinna is separate from the caudal rim of fossa angularis
• ears appear lower and further forward on the head (J:8618)
• ventrally shifted (J:338204)
• at E13.5 the pinnae are ventrally shifted from the developing tragus and a furrow appears near the fossa angularis (J:338204)
• lowered ear position is visible at E13.5 and E17.5 (J:338204)
• pinna is more rectangular than oval
• pinna is shapeless and thin and does not project upward over skull
• auricle is exposed
• anthelix is a slight elevation near the margin of the pinna rather than a distinct and sharp fold
• tragus and antitragus are farther apart then wildtype
• external auditory meatus remains open at birth

immune system

skeleton
• hypoplastic paraoccipital process in 9 of 11 mice
• slightly hypoplastic at E18.5

hearing/vestibular/ear
N
• hearing thresholds at 8 weeks of age are indistinguishable from wild-type controls
• similar to wild-type controls hearing thresholds are moderately impaired at 6 months of age
• ears appear lower and further forward on the head (J:8618)
• ventrally shifted (J:338204)
• at E13.5 the pinnae are ventrally shifted from the developing tragus and a furrow appears near the fossa angularis (J:338204)
• lowered ear position is visible at E13.5 and E17.5 (J:338204)
• pinna is more rectangular than oval
• pinna is shapeless and thin and does not project upward over skull
• auricle is exposed
• anthelix is a slight elevation near the margin of the pinna rather than a distinct and sharp fold
• tragus and antitragus are farther apart then wildtype
• external auditory meatus remains open at birth
• abnormal shape consistent with abnormal orientation of the tympanic ring
• abnormal orientation
• ventrally shifted and slightly smaller at E18.5

embryo
• the shape of the bottom of the fossa angularis forms a shallow trough rather than a narrow furrow at E13
• in at least one E13 embryo, the distance between the edge of the pinna and the tragus is increased in comparison to wild-type
• abnormal low-set position of primitive pinna is first observed at E13
• rather than fusing, the lower end of the pinna is separate from the caudal rim of fossa angularis

vision/eye
• disorganized stellate morphology at E14.5
• decrease in the space between the cornea and the lens at E14.5
• slight bulging

growth/size/body
• slightly hypoplastic at E18.5
• ears appear lower and further forward on the head (J:8618)
• ventrally shifted (J:338204)
• at E13.5 the pinnae are ventrally shifted from the developing tragus and a furrow appears near the fossa angularis (J:338204)
• lowered ear position is visible at E13.5 and E17.5 (J:338204)
• pinna is more rectangular than oval
• pinna is shapeless and thin and does not project upward over skull
• auricle is exposed
• anthelix is a slight elevation near the margin of the pinna rather than a distinct and sharp fold
• tragus and antitragus are farther apart then wildtype
• external auditory meatus remains open at birth
• heterozygotes are smaller than wild-type at birth
• occasional

digestive/alimentary system
• slightly hypoplastic at E18.5

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
chromosomal duplication syndrome DOID:0060429 J:338204




Genotype
MGI:7705898
cx3
Allelic
Composition
Lse/Lse+
Twist1tm1Bhr/Twist1+
Genetic
Background
involves: 129S7/SvEvBrd * C3H/HeJ * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
Lse mutation (1 available); any Lse mutation (1 available)
Twist1tm1Bhr mutation (4 available); any Twist1 mutation (18 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
mortality/aging

craniofacial
• apparent posterior cleft at E18.5 in microCT scans
• epiglottal soft-tissue cleft in the posterior soft palate

behavior/neurological

limbs/digits/tail
• hindlimb polydactyly

growth/size/body
• apparent posterior cleft at E18.5 in microCT scans
• epiglottal soft-tissue cleft in the posterior soft palate
• air-filled swollen abdomens at P0

hearing/vestibular/ear

digestive/alimentary system
• apparent posterior cleft at E18.5 in microCT scans
• epiglottal soft-tissue cleft in the posterior soft palate





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