Overview

Also Known As:Il1rap KO/APOE4/Trem2*R47H, exon 2 KO

This triple mutant strain carries a humanized ApoE knock-in mutation (sequence coding for isoform E4), a CRISPR/cas9-generated 387bp deletion in the first coding exon knock-out mutation of the Il1rap gene and a CRISPR/cas9-generated R47H point mutation of the Trem2 gene. These mice may be suitable for use in studies related to Alzheimer's disease, lipoproteins, arteriosclerosis, and coronary heart disease.

Donating Investigator

Mike Sasner, The Jackson Laboratory

Genetic overview

Genetic Background	Generation

Trem2^em1Adiuj

Allele Type	Gene Symbol	Gene Name
Endonuclease-mediated (Humanized sequence)	Trem2	triggering receptor expressed on myeloid cells 2

Il1rap^em1Adiuj

Allele Type	Gene Symbol	Gene Name
Endonuclease-mediated (Null/Knockout)	Il1rap	interleukin 1 receptor accessory protein

Apoe^{tm1.1(APOE4)Adiuj}*

Allele Type	Gene Symbol	Gene Name
Targeted (Inserted expressed sequence, Humanized sequence)	Apoe	apolipoprotein E

View Genetics

Research Applications

Neurobiology Research
Research Tools
Metabolism Research
Cardiovascular Research

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Base Price

Starting at:

$2,854.50 Domestic price Cryo Recovery

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Details

Detailed Description

This triple mutant strain carries a humanized ApoE knock-in allele, in which exons 2, 3 and most of exon 4 of the mouse Apoe gene were replaced by human APOE4 gene sequence including exons 2, 3 and 4 (and some 3' UTR sequence); a mutant knock-out allele, 387bp deletion in the first coding exon, of the Il1rap gene; and a knock-in of a point mutation into mouse Trem2, triggering receptor expressed on myeloid cells 2, gene containing a R47H point mutation, with two silent mutations. The targeted Apoe gene encodes apolipoprotein E, which is important in lipoprotein metabolism and cardiovascular disease as well as Alzheimer’s disease, immunoregulation and cognition. The targeted Il1rap gene encodes interleukin 1 receptor accessory protein which is a component of the interleukin 1 receptor complex, and is involved in interleukin 1 signalling. The targeted Trem2 gene encodes a protein that is part of a receptor signaling complex with TYRO protein tyrosine kinase binding protein, and that activates macrophages and dendritic cells during immune responses. The TREM2 R47H mutation is a missense mutation in exon 2 that is one of the strongest genetic risk factors for late-onset Alzheimer's disease. Mice that are homozygous for the Apoe^{tm1.1(APOE*4)Adiuj} and Trem2^em1Adiuj alleles, and heterozygous for the Il1rap^em1Adiuj allele are viable and fertile. Homozygous viability/fertility has not been tested for the Il1rap^em1Adiuj allele (June 2018). As the mice are characterized, we will modify the strain description and add phenotype data.

Of note, in brains of mice homozygous for the Trem2^em1Adiuj allele (and not carrying any other mutant alleles), expression of both transcripts of Trem2 is decreased by about 50%. Mice expressing the Trem2 R47H mutation also express a novel splice variant with a deletion of 119bp at the 5’ end of exon 2, due to a cryptic splice acceptor site in exon 2 (see Stock No. 027918).

Development

This triple mutant line was generated by utilizing CRISPR/cas9 endonuclease mediated genome editing of the Il1rap gene in B6(SJL)-Apoe^{tm1.1(APOE*4)Adiuj} Trem2^em1Adiuj/J (available as Stock No. 028709) mice.

The double mutant B6(SJL)-Apoe^{tm1.1(APOE*4)Adiuj} Trem2^em1Adiuj/J (Stock No. 028709) was generated by crossing 2 single mutant lines.

For the Apoe^{tm1.1(APOE*4)Adiuj} allele (available as Stock No. 027894):
A targeting vector containing a 3' FRT flanked neo cassette was used to replace exons 2, 3 and most of exon 4 with 1.5 kb of human APOE gene sequence including exons 2, 3 and 4 (and some 3' UTR sequence). The human ApoE sequence also contains a 2 nucleotide A to T substitution in intron 3 for identification of the targeted allele by Southern analysis. The construct was electroporated into C57BL/6J derived embryonic stem (ES) cells. Correctly targeted ES cells were injected into blastocysts. The resulting chimeric animals were tested for germline transmission by crossing to C57BL/6J. Heterozygous animals were crossed subsequently to FLP recombinase expressing mice (see Stock No. 005703) to remove the FRT site flanked PGK-neo cassette. Mice that no longer contained the FRT flanked PGK-neo cassette were then backcrossed to C57BL/6J at least once to remove the FLP recombinase transgene.

For the Trem2^em1Adiuj allele (available as Stock No. 027918):
Plasmids encoding a single guide RNA designed to introduce a R47H point mutation, with two silent mutations, into the Trem2 gene and the cas9 nuclease were introduced into the cytoplasm of C57BL/6J-derived fertilized eggs with well recognized pronuclei. Correctly targeted embryos were transferred to pseudopregnant females. Correctly targeted pups were identified by sequencing and PCR and further bred to C57BL/6J (Stock No. 000664) to develop the colony.

For the Il1rap^em1Adiuj allele: plasmids encoding a single guide RNA designed to introduce a knock-out mutation, 387bp deletion in the first coding exon, into the Il1rap gene and the cas9 nuclease were introduced into the cytoplasm of B6(SJL)-Apoe^{tm1.1(APOE*4)Adiuj} Trem2^em1Adiuj/J (Stock No. 028709)-derived fertilized eggs with well recognized pronuclei. Correctly targeted embryos were transferred to pseudopregnant females. Correctly targeted pups were identified by sequencing and PCR and further bred to B6(SJL)-Apoe^{tm1.1(APOE*4)Adiuj} Trem2^em1Adiuj/J (Stock No. 028709) to develop the colony.

Expression Data

Expressed Gene	APOE, apolipoprotein E, human
Site of Expression

Control Suggestions

B6(SJL)-Apoe^{tm1.1(APOE*4)Adiuj} Trem2^em1Adiuj/J mice (Stock No. 028709) may be an appropriate control.

Additional Information

Considerations for Choosing Controls

Genetics

Trem2^em1Adiuj

Allele Symbol: Trem2^em1Adiuj

Allele Name	endonuclease-mediated mutation 1, MODEL-AD Center
Allele Type	Endonuclease-mediated (Humanized sequence)
Allele Synonym(s)	Trem2^em1Adiuj; endonuclease-mediated mutation 1, MODEL-AD Center
Gene Symbol and Name	Trem2, triggering receptor expressed on myeloid cells 2
Gene Synonym(s)	TREM-2; Trem2b; Trem2c; Trem2a; Trem2b; Trem2c; triggering receptor expressed on myeloid cells 2c; Trem2a; triggering receptor expressed on myeloid cells 2a; triggering receptor expressed on myeloid cells 2b; PLOSL2
Strain of Origin	C57BL/6J
Chromosome	17
Molecular Note	The allele was generated by injecting cas9 nuclease and a single guide RNA designed to introduce a R47H point mutation with two silent mutations (lysine AAG>AAA and alanine GCC>GCA) into the gene.

Il1rap^em1Adiuj

Allele Symbol: Il1rap^em1Adiuj

Allele Name	endonuclease-mediated mutation 1, MODEL-AD Center
Allele Type	Endonuclease-mediated (Null/Knockout)
Allele Synonym(s)	endonuclease-mediated mutation 1, MODEL-AD Center; Il1rap^em1Adiuj
Gene Symbol and Name	Il1rap, interleukin 1 receptor accessory protein
Gene Synonym(s)	expressed sequence AI255955; C3orf13; RIKEN cDNA 6430709H04 gene; IL-1RAcP; 6430709H04Rik; expressed sequence AV239853; AI255955; IL-1R AcP; IL1R3; Il1racpb; 6430709H04Rik; AV239853; IL-1RAcp
Strain of Origin	B6(SJL)-Apoe^{tm1.1(APOE*4)Adiuj} Trem2^em1Adiuj/J
Chromosome	16
Molecular Note	CRISPR/cas9 endonuclease-mediated genome editing is used to introduce a 387bp deletion in the first coding exon. The mutation is believed to generate a null allele.

Apoe^{tm1.1(APOE4)Adiuj}*

Allele Symbol: Apoe^{tm1.1(APOE4)Adiuj}*

Allele Name	targeted mutation 1.1, MODEL-AD Center
Allele Type	Targeted (Inserted expressed sequence, Humanized sequence)
Allele Synonym(s)	Apoe^{tm1.1(APOE*4)Adiuj}; targeted mutation 1.1, MODEL-AD Center
Gene Symbol and Name	Apoe, apolipoprotein E
Gene Synonym(s)	expressed sequence AI255918; APO-E; AD2; LPG; AI255918; LDLCQ5; APOEA; ApoE4
Expressed Gene	APOE, apolipoprotein E, human
Strain of Origin	C57BL/6J
Chromosome	7
Molecular Note	The targeting vector contains a 3' FRT flanked neo cassette and 1.5 kb of human APOE gene sequence including exons 2, 3, 4 and a portion of the 3'UTR sequence (the APOE4 isoform) which is used to replace exons 2, 3 and most of exon 4 of the endogenous sequence. The human ApoE sequence carries a 2 nucleotide A to T substitution in intron 3. Flp-mediated recombination removed the FRT-flanked neo cassette.

Disease/Phenotype

Disease Terms

Research Areas By Phenotype

This mouse can be used to support research in many areas including:

Neurobiology Research
- Alzheimer's Disease
  - APOE mutants
Research Tools
- Neurobiology Research
- Cardiovascular Research
Metabolism Research
- Lipid Metabolism
Cardiovascular Research

Mammalian Phenotype Terms by Genotype

References

Additional - Apoe^{tm1.1(APOE4)Adiuj}* related

Additional - Il1rap^em1Adiuj related

Additional - Trem2^em1Adiuj related

Technical Support

CONTACT TECHNICAL SUPPORT

Genotyping Protocols
- End Point Analysis:Trem2
- Standard PCR:Apoe
- Probe:Il1rap KO (387 bp del) - Probe
- Genotyping resources and troubleshooting
Breeding Considerations

When maintaining a live colony, mice homozygous for the Apoe^{tm1.1(APOE*4)Adiuj} and Trem2^em1Adiuj alleles, and heterozygous for the Il1rap^em1Adiuj allele may be bred.
Homozygous viability/fertility has not been tested for the Il1rap^em1Adiuj allele (June 2018).
As the mice are characterized, we will modify the strain description if necessary and add data related to viability and fertility.
- Additional Breeding and Husbandry Support
Mating System
- Homozygote x Homozygote
Citation
When using the Il1rap KO/APOE4/Trem2*R47H, exon 2 KO
mouse strain in a publication, please cite the originating article(s) and include JAX stock #030304 in your Materials and Methods section.

Animal Health Reports

Facility Barrier Level Descriptions

Production of mice from cryopreserved embryos or sperm occurs in a maximum barrier room, G200

Pricing & Availability

Cryo Recovery

Domestic
International

Live Mouse

Age

Genotype

Price

weeks

Cryorecovery - Pricing

Service/Product	Description	Price
	Homozygous for Apoe<tm1.1(APOE*4)Adiuj> and Trem2<em1Adiuj>, heterozygous or wildtype for Il1rap<em1Adiuj>

Payment Terms and Conditions

Terms are granted by individual review and stated on the customer invoice(s) and account statement. These transactions are payable in U.S. currency within the granted terms. Payment for services, products, shipping containers, and shipping costs that are rendered are expected within the payment terms indicated on the invoice or stated by contract. Invoices and account balances in arrears of stated terms may result in The Jackson Laboratory pursuing collection activities including but not limited to outside agencies and court filings.

The Jackson Laboratory's Genotype Promise

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.

Terms Of Use

General Terms and Conditions

Questions about Terms of Use

Additional Use Restrictions Apply

The use of this mouse model is subject to the terms and conditions of the Limited License from The Broad Institute.

The use of this mouse model is subject to the terms and conditions of the Limited Use Label License from Caribou Biosciences, Inc.

Licensing Information

Phone: 207-288-6470

Email: TechTran@jax.org

JAX® Mice, Products & Services Conditions of Use

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Also Known As:Il1rap KO/APOE4/Trem2*R47H, exon 2 KO

Donating Investigator

Genetic overview

Research Applications

Base Price

Detailed Description

Development

Expression Data

Control Suggestions

Additional Information

Trem2em1Adiuj

Allele Symbol: Trem2em1Adiuj

Il1rapem1Adiuj

Allele Symbol: Il1rapem1Adiuj

Apoetm1.1(APOE*4)Adiuj

Allele Symbol: Apoetm1.1(APOE*4)Adiuj

Disease Terms

Research Areas By Phenotype

This mouse can be used to support research in many areas including:

Mammalian Phenotype Terms by Genotype

References

Additional - Apoetm1.1(APOE*4)Adiuj related

Additional - Il1rapem1Adiuj related

Additional - Trem2em1Adiuj related

Genotyping Protocols

Breeding Considerations

Mating System

Citation

Animal Health Reports

Production of mice from cryopreserved embryos or sperm occurs in a maximum barrier room, G200

Live Mouse

Cryorecovery - Pricing

Payment Terms and Conditions

The Jackson Laboratory's Genotype Promise

Terms Of Use

Additional Use Restrictions Apply

Licensing Information

JAX® Mice, Products & Services Conditions of Use

No Warranty

Credit for PRODUCTS or SERVICES

Animal Care and Use for SERVICES

No Liability

Trem2^em1Adiuj

Allele Symbol: Trem2^em1Adiuj

Il1rap^em1Adiuj

Allele Symbol: Il1rap^em1Adiuj

Apoe^{tm1.1(APOE4)Adiuj}*

Allele Symbol: Apoe^{tm1.1(APOE4)Adiuj}*

Additional - Apoe^{tm1.1(APOE4)Adiuj}* related

Additional - Il1rap^em1Adiuj related

Additional - Trem2^em1Adiuj related