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Phenotypes associated with this allele
Allele Symbol
Allele Name
Allele ID
L1camtm1(tTA)Msch
targeted mutation 1, Melitta Schachner
MGI:3624137
Summary 2 genotypes
Jump to Allelic Composition Genetic Background Genotype ID
ht1
L1camtm1(tTA)Msch/L1cam+ 129.Cg-L1camtm1(tTA)Msch MGI:5763180
ot2
L1camtm1(tTA)Msch/Y involves: 129 * C57BL/6J MGI:3624745


Genotype
MGI:5763180
ht1
Allelic
Composition
L1camtm1(tTA)Msch/L1cam+
Genetic
Background
129.Cg-L1camtm1(tTA)Msch
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
L1camtm1(tTA)Msch mutation (0 available); any L1cam mutation (12 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
behavior/neurological
N
• heterozygous mice show no differences from wild-type in the open field, elevated plus-maze, post-shock reactivity tests, on the balance beam and balance pole tests, in the screen hang and rod hang tests, in the spatial water maze test, or in nest building
• mice spend less time in the light side of the light/dark box test
• in the light gradient test, mice are quick to enter the dark gradient but slow to enter the light compared to wild-type mice which show the opposite pattern
• however, since no differences from controls are seen in the elevated plus-maze or in other aspects of the light gradient test, performance most likely reflects increased sensitivity to light than anxiety
• mice groom for a longer period of time than wild-type mice
• however, mice do not show differences in the digging test
• in the sociability test, mice explore the side with a male less than the empty side
• in the resident-intruder test, mice show no differences in interaction with female than with male intruders unlike wild-type mice which interact more with females than males, indicating less sensitivity to the sex of the intruder




Genotype
MGI:3624745
ot2
Allelic
Composition
L1camtm1(tTA)Msch/Y
Genetic
Background
involves: 129 * C57BL/6J
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
L1camtm1(tTA)Msch mutation (0 available); any L1cam mutation (12 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
growth/size/body
• L1cam-deficient mice are smaller than wild-type littermates

nervous system
• severe hydrocephaly was present in one mutant
• mutant mice show a spectrum of ventricle morphology, from apparently normal-sized to severely dilated ventricles
• Background Sensitivity: when backcrossed onto a C57BL/6J background, mutants eventually develop enlarged ventricles
• all mutant mice with enlarged ventricles examined have patent cerebral aqueducts: in severely hydrocephalic mutants the cerebral aqueduct is closed and elongated in a dorso-ventral direction
• in mutants with severely enlarged ventricles, the hippocampus is displaced from a medio-lateral to a ventro-dorsal orientation
• the mutant with severe hydrocephaly has a significantly thinned cerebral cortex
• severely hydrocephalic mutants display cerebellar atrophy

craniofacial
• one mutant had significant enlargement of the skull, resulting from hydrocephalus

skeleton
• one mutant had significant enlargement of the skull, resulting from hydrocephalus





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last database update
05/07/2024
MGI 6.23
The Jackson Laboratory