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Phenotypes Associated with This Genotype
either: (involves: 129/Sv * C57BL/6J) or (involves: 129/Sv * 129S/SvEv)
Find Mice Using the International Mouse Strain Resource (IMSR)
Mouse lines carrying:
L1camtm1Mtei mutation (0 available); any L1cam mutation (11 available)
phenotype observed in females
phenotype observed in males
N normal phenotype
• mutant mice are smaller than wild-type

• mutants have trouble using their hindlimbs and often stumble (ie. when walking over a metal grid)
• mutants show no reaction to being touched lightly on the flank or to a needle poke
• hind legs of mutants appear weak and uncoordinated
• when placed on a metal grid which is then inverted, mutants often lose their grip (11/17) and fall with a average time to falling 17.7 seconds compared to wild-type (1 animal fell after 56 seconds)
• mutants placed on a warm plate display a delay in jumping off the plate compared to wild-type

nervous system
• Background Sensitivity: a high percentage of male mutants on the C57BL/6J background displayed enlarged brain ventricles; on a 129/SvEv background, no animals had enlarged ventricles
• in mutants, many non-myelinating Schwann cells (87%) form additional processes, protruding in the endoneurial space not associated with axons and covered by a basal lamina; no wild-type non-myelinating Schwann cells have such processes
• size is reduced in mutants
• when cultured on poly-L-lysine + L1 substrate, mutant cerebellar neurons show no outgrowth whereas wild-type neurons grow vigorously
• cerebellar explants from mutant mice show reduced fasciculation compared to wild-type

• eyes of mutants are set further back in their sockets

Mouse Models of Human Disease
DO ID OMIM ID(s) Ref(s)
MASA syndrome DOID:0060246 OMIM:303350

Contributing Projects:
Mouse Genome Database (MGD), Gene Expression Database (GXD), Mouse Models of Human Cancer database (MMHCdb) (formerly Mouse Tumor Biology (MTB), Gene Ontology (GO)
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last database update
MGI 6.21
The Jackson Laboratory