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Smn1tm3(SMN2/Smn1)Mrph
Targeted Allele Detail
Nomenclature
Symbol: Smn1tm3(SMN2/Smn1)Mrph
Name: survival motor neuron 1; targeted mutation 3, Andrew Murphy
MGI ID: MGI:3794199
Synonyms: hybrid rescue allele, Smn1 COIN (conditional inversion), SmnINV, SmnRes
Gene: Smn1  Location: Chr13:100124852-100137690 bp, + strand  Genetic Position: Chr13, 52.99 cM, cytoband D1/D2.1
Mutation
origin
Germline Transmission:  Earliest citation of germline transmission: J:135423
Parent Cell Line:  F1H4 (ES Cell)
Strain of Origin:  (129S6/SvEvTac x C57BL/6NTac)F1
Mutation
description
Allele Type:    Targeted (Conditional ready, Humanized sequence, No functional change)
Mutation:    Insertion
 
Mutation detailsExons 7 and 8 of the mouse Smn1 (survival motor neuron 1) gene and a several hundred base pairs of flanking sequence were replaced with a fragment containing, in order: 1) an inverted lox71 site; 2) exon 7 from the human SMN2 (survival of motor neuron 2, centromeric) gene flanked by several hundred base pairs of intron sequence; 3) an inverted copy of mouse Smn1 exon 7 flanked by several hundred base pairs of intron sequence; 4) a lox66 site; 5) an FRT site remnant from a deleted selection cassette; and 6) human SMN2 exon 8 including the 3'UTR and polyA signal with several hundred base pairs of flanking sequence. The engineered allele expresses a hybrid Smn1 gene containing mouse Smn1 exons 1 through 6 and human SMN2 exons 7 and 8. The human SMN2 exon 7 is skipped in the majority of mRNA derived from the hybrid gene due to a single base pair difference in human SMN2 exon 7, compared to human SMN1 exon 7. Following Cre-mediated irreversible inversion of the fragment bordered by the lox71 and lox66 sites, the allele is "rescued" into a format that contains mouse Smn1 exons 1 through 7 and human SMN2 exon 8. Because the mouse Smn1 exon 8 is efficiently spliced, the majority of the mRNA from the rescue allele after Cre-mediated inversion contains mouse Smn1 exon 7. (J:135423)
Phenotypes
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View phenotypes and curated references for all genotypes (concatenated display).
Find Mice (IMSR)
Mouse strains and cell lines available from the International Mouse Strain Resource (IMSR)
Carrying this Mutation:  Mouse Strains: 4 strains available      Cell Lines: 0 lines available
Carrying any Smn1 Mutation:  76 strains or lines available
References
Original:  J:135423 Murphy A (Regeneron Pharmaceuticals, Inc.), Smn1 hybrid rescue allele, COIN (conditional inversion). Personal Communication. 2008;
All:  16 reference(s)

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
04/13/2021
MGI 6.16
The Jackson Laboratory