These conditional targeted mutation mice carry loxP sites on either side of the first unique coding exon of the neurexin beta promoter isoforms of Nrxn1 (neurexin I), Nrxn2 (neurexin II), and Nrxn3 (neurexin III). These exons correspond to exon 18 of Nrxn1 (neurexin I), exon 17 of Nrxn2 (neurexin II), and exon 17 of Nrxn3 (neurexin III). When crossed with a Cre recombinase-expressing strain, this strain is useful in eliminating tissue-specific expression of the beta isoforms of the gene(s). This strain may be useful in studies of neuronal synaptic vesicle exocytosis.
Note: The original curations for this strain indicated that exon 1 of the Nrxn1, Nrxn2, and Nrxn3 genes were modified. Subsequent published information (Anderson, 2015) clarified that it was the first exon of the beta promoter isoforms that were targeted. (September, 2019)
Dr. Thomas C. Sudhof, Stanford University School of Medicine
Genetic Background | Generation |
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|
Allele Type | Gene Symbol | Gene Name |
---|---|---|
Targeted (Conditional ready (e.g. floxed), No functional change) | Nrxn1 | neurexin I |
Allele Type | Gene Symbol | Gene Name |
---|---|---|
Targeted (Conditional ready (e.g. floxed), No functional change) | Nrxn2 | neurexin II |
Allele Type | Gene Symbol | Gene Name |
---|---|---|
Targeted (Conditional ready (e.g. floxed), No functional change) | Nrxn3 | neurexin III |
These conditional targeted mutation mice carry loxP sites on either side of the first unique coding exon of the neurexin beta promoter isoforms of Nrxn1 (neurexin I), Nrxn2 (neurexin II), and Nrxn3 (neurexin III). These exons correspond to exon 18 of Nrxn1 (neurexin I), exon 17 of Nrxn2 (neurexin II), and exon 17 of Nrxn3 (neurexin III). These exons have been further modified to include green fluorescent protein (GFP) (neurexins 1 and 3), or hemagglutinin (HA) protein (neurexin 2). The GFP and HA inserts don't affect the expression of the beta neurexin genes, but it is very difficult to detect signals in the tissue by immunohistochemistry or direct fluorescence. The single, double and triple homozygous floxed mutants are fully viable, fertile, normal in size, and do not display any gross physical or behavioral abnormalities. When crossed with a Cre recombinase-expressing strain, this strain is useful in eliminating tissue-specific expression of the beta isoforms of the gene(s). This strain may be useful in studies of neuronal synaptic vesicle exocytosis.
Homozygous deletion of the beta neurexin 3 floxed segment mediated through Cre excision generates pups with normal viability and fertility; triple knockout mice are viable, but are infertile and smaller in size (~70% of wild-type in body weight).
Note: The original curations for this strain indicated that exon 1 of the Nrxn1, Nrxn2, and Nrxn3 genes were modified. Subsequent published information (Anderson, 2015) clarified that it was the first exon of the beta promoter isoforms that were targeted. (September, 2019).
Each of the three targeted genes were modified by the insertion of a loxP site in the 5' UTR, and an Frt-flanked neomycin cassette with a 3' loxP site in the first unique coding exon of the neurexin beta promoter isoforms of Nrxn1 (neurexin I), Nrxn2 (neurexin II), and Nrxn3 (neurexin III). These exons correspond to exon 18 of Nrxn1 (neurexin I), exon 17 of Nrxn2 (neurexin II), and exon 17 of Nrxn3 (neurexin III). These exons have been further modified to include green fluorescent protein (GFP) (neurexins 1 and 3), or hemagglutinin (HA) protein (neurexin 2).
The GFP and HA inserts don't affect the expression of beta neurexin genes, but it is very difficult to detect GFP and HA signals in the tissue by immunohistochemistry or direct fluorescence. The genes were independently targeted in (129X1/SvJ x 129S1/Sv)F1- Kitl+-derived R1 embryonic stem (ES) cells. Resultant germline mutant mice were crossed with a transgenic flipase (FLP) strain on a mixed C57BL/6 and 129 background to remove the neomycin cassettes. The three mutations were intercrossed and backcrossed three or more times to C57BL/6.
Note: The original curations for this strain indicated that exon 1 of the Nrxn1, Nrxn2, and Nrxn3 genes were modified. Subsequent published information (Anderson, 2015) clarified that it was the first exon of the beta promoter isoforms that were targeted. (September, 2019).
Allele Name | targeted mutation 2, Thomas C Sudhof |
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Allele Type | Targeted (Conditional ready (e.g. floxed), No functional change) |
Allele Synonym(s) | Nrxn1beta cKO |
Gene Symbol and Name | Nrxn1, neurexin I |
Gene Synonym(s) | |
Strain of Origin | (129X1/SvJ x 129S1/Sv)F1-Kitl+ |
Chromosome | 17 |
Molecular Note | A loxP site was inserted into the 5' end of a modified exon 18, which contains an EGFP reporter gene followed by FRT-flanked neomycin resistance cassette and a loxP site. Flp-mediated recombination removed the selection cassette and left the modified exon 18 floxed. The GFP insert does not affect the expression of neurexin 1 gene, but it is very difficult to detect GFP signals in the tissue by immunohistochemistry or direct fluorescence. |
Allele Name | targeted mutation 2, Thomas C Sudhof |
---|---|
Allele Type | Targeted (Conditional ready (e.g. floxed), No functional change) |
Allele Synonym(s) | Nrxn2beta cKO |
Gene Symbol and Name | Nrxn2, neurexin II |
Gene Synonym(s) | |
Strain of Origin | (129X1/SvJ x 129S1/Sv)F1-Kitl+ |
Chromosome | 19 |
Molecular Note | A loxP site was inserted into the 5' end of a modified exon 17, which contains an hemagglutinin (HA) reporter tag followed by a FRT-flanked neomycin resistance cassette and a loxP site. Flp-mediated recombination removed the selection cassette and left the modified exon 17 floxed. The HA insert does not affect the expression of neurexin 2 gene, but it is very difficult to detect GFP signals in the tissue by immunohistochemistry. |
Allele Name | targeted mutation 2, Thomas C Sudhof |
---|---|
Allele Type | Targeted (Conditional ready (e.g. floxed), No functional change) |
Allele Synonym(s) | Nrxn3beta cKO |
Gene Symbol and Name | Nrxn3, neurexin III |
Gene Synonym(s) | |
Strain of Origin | (129X1/SvJ x 129S1/Sv)F1-Kitl+ |
Chromosome | 12 |
Molecular Note | A loxP site was inserted into the 5' end of a modified exon 17, which contains an EGFP reporter gene followed by a FRT-flanked neomycin resistance cassette and a loxP site. Flp-mediated recombination removed the selection cassette and left the modified exon 17 floxed. The GFP insert does not affect the expression of neurexin 3 gene, but it is very difficult to detect GFP signals in the tissue by immunohistochemistry or direct fluorescence. |
When maintained as a live colony, triple homozygous floxed mice may be intercrossed.
When using the NBR mouse strain in a publication, please cite the originating article(s) and include JAX stock #008416 in your Materials and Methods section.
Facility Barrier Level Descriptions
Service/Product | Description | Price |
---|---|---|
Inbred, 1 pair minimum will be suppliedHomozygous for Nrxn3<tm2Sud>,Homozygous for Nrxn1<tm2Sud>, Homozygous for Nrxn2<tm2Sud> |
Frozen Mouse Embryo | B6;129-Nrxn3<tm2Sud> Nrxn1<tm2Sud> Nrxn2<tm2S Frozen Embryos | $2595.00 |
Frozen Mouse Embryo | B6;129-Nrxn3<tm2Sud> Nrxn1<tm2Sud> Nrxn2<tm2S Frozen Embryos | $2595.00 |
Frozen Mouse Embryo | B6;129-Nrxn3<tm2Sud> Nrxn1<tm2Sud> Nrxn2<tm2S Frozen Embryos | $3373.50 |
Frozen Mouse Embryo | B6;129-Nrxn3<tm2Sud> Nrxn1<tm2Sud> Nrxn2<tm2S Frozen Embryos | $3373.50 |
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The Jackson Laboratory has rigorous genetic quality control and mutant gene genotyping programs to ensure the genetic background of JAX® Mice strains as well as the genotypes of strains with identified molecular mutations. JAX® Mice strains are only made available to researchers after meeting our standards. However, the phenotype of each strain may not be fully characterized and/or captured in the strain data sheets. Therefore, we cannot guarantee a strain's phenotype will meet all expectations. To ensure that JAX® Mice will meet the needs of individual research projects or when requesting a strain that is new to your research, we suggest ordering and performing tests on a small number of mice to determine suitability for your particular project. We do not guarantee breeding performance and therefore suggest that investigators order more than one breeding pair to avoid delays in their research.
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