STOCK Gt(ROSA)26Sor^{em2(CAG-LOC4337827*)Mbu} Prdm1^em2Mbu/J

Stock number: 040299
Product name: Prdm1^Aid Rosa26^Tir1-F74G
Research areas: Cell Biology Research, Hematological Research, Immunology, Inflammation and Autoimmunity Research, Research Tools

Description

Prdm1^AID Rosa26^Tir1-F74G mice constitutively express a modified Oryza sativa F-box transport inhibitor response 1 protein, harboring the F74G modification, as well as a C-terminal AID-tagged Prdm1 allele. This mouse line can be used in the second-generation auxin-inducible degron (AID2) system, resulting in rapid and reversible degradation of PRDM1-AID tagged protein in B- and T-cell lineages.

The donating laboratory has made other mouse lines available for use in the AID2 system: Rosa26^Tir1-F74G (Stock No. 039661), Pax5^AID Rosa26^Tir1-F74G (Stock No. 040293), Ebf1^AID Rosa26^Tir1-F74G (Stock No. 040294), Tcf3^AID Rosa26^Tir1-F74G (Stock No. 040295), Ikzf1^AID Ikzf3^AID Rosa26^Tir1-F74G (Stock No. 040296), Ikzf1^AID Rosa26^Tir1-F74G (Stock No. 040297), Ikzf3^AID Rosa26^Tir1-F74G (Stock No. 040298) and Tcf4^AID Rosa26^Tir1-F74G (Stock No. 040300).

Detailed description

This Prdm1^Aid Rosa26^Tir1-F74G mouse line was generated by crossing Rosa26^Tir1-F74G mice (Stock No. 039661) with mice that express an auxin-inducible degron (AID)-tagged Prdm1 knock-in allele (Prdm1^AID). The resulting Prdm1^AIDRosa26^Tir1-F74G mice constitutively express the Japanese rice Oryza sativa F-box transport inhibitor response 1 (TIR1, formal name LOC4337827) protein, harboring the F74G modification, for use in the second-generation auxin-inducible degron (AID2) system for rapid and reversible degradation of auxin inducible degron-tagged (AID) proteins. This strain also has a glycine linker, a minimal auxin-inducible degron (Aid) sequence, and the V5 epitope, inserted immediately upstream of the 3' UTR of the PR domain containing 1, with ZNF domain (Prdm1) gene coding for the transcription factor BLIMP1. TIR1 interacts with the mouse Cullin-RING ubiquitin ligase complex and the AID-targeted PRDM1 protein; the F74G mutation abolishes the spontaneous degradation activity of TIR1 and increases the affinity for the auxin derivative 5-phenyl-indole-3-acetic acid (5-Ph-IAA), which as injected intraperitoneally at 10mg/kg body weight. Following addition of 5-Ph-IAA, the C-terminal AID-tagged PRDM1 is degraded by the proteasome.

Mice that are homozygous for both alleles are viable and fertile with no overt phenotype. Prdm1, codes for a transcription factor, also known as BLIMP1, that is involved in the regulation of both B cell and T cell differentiation as well as immunosuppression. These Prdm1^Aid Rosa26^Tir1-F74G mice may be useful for studying the role of the PRDM1 protein in B-cell and T-cell development and differentiation.

The donating laboratory has made other mouse lines available for use in the AID2 system: Rosa26^Tir1-F74G (Stock No. 039661), Pax5^AID Rosa26^Tir1-F74G (Stock No. 040293), Ebf1^AID Rosa26^Tir1-F74G (Stock No. 040294), Tcf3^AID Rosa26^Tir1-F74G (Stock No. 040295), Ikzf1^AID Ikzf3^AID Rosa26^Tir1-F74G (Stock No. 040296), Ikzf1^AID Rosa26^Tir1-F74G (Stock No. 040297), Ikzf3^AID Rosa26^Tir1-F74G (Stock No. 040298) and Tcf4^AID Rosa26^Tir1-F74G (Stock No. 040300).

Development

This Prdm1^Aid Rosa26^Tir1-F74G mouse line was generated by crossing Rosa26^Tir1-F74G mice (Stock No. 039661) with mice that express an auxin-inducible degron (AID)-tagged Prdm1 knock-in allele (Prdm1^AID).

The Rosa26^Tir1-F74G knock-in (KI) allele was generated by introducing the F74G mutation into an existing Rosa26^Tir1 allele (Baker et al, Sci. Rep, 2016), using CRISPR/Cas9 endonuclease-mediated homology-directed repair (HDR) genome editing. See Stock No. 039661 for specific details about the development of this Rosa26^Tir1-F74G KI allele.

The Prdm1^Aid allele was generated using CRISPR/Cas9 endonuclease-mediated genome editing. A single guide RNA (5'-TGAAAATCTTAAGGATCCAT-3') was used to insert a glycine linker, a minimal auxin-inducible degron sequence and the V5 epitope in frame to the last amino acid sequence of the PR domain containing 1, with ZNF domain (Prdm1) gene on chromosome 10. Prdm1 transcript Prdm1-201 (ENSMUST00000039174.11) was used as reference for the exon number and the guide sequences. The sgRNAs, ssDNA, and the Cas9 nuclease were introduced into the cytoplasm of zygotes derived from (C57BL/6J x CBA/J)F1 mice with well recognized pronuclei. Correctly targeted pups were identified by PCR and sequencing. The resulting Prdm1^AID mice were backcrossed to C57BL/6J mice for at least 4 generations before crossing to Rosa26^Tir1-F74G mice (JAX Stock No. 039661) to generate the Prdm1^Aid Rosa26^Tir1-F74G mouse line (see SNP note below). Upon arrival at The Jackson Laboratory, sperm was cryopreserved. To establish a live colony, an aliquot of frozen sperm was used to fertilize C57BL/6J (Stock No. 000664) oocytes.

In 2025, a 48 SNP (single nucleotide polymorphism) panel analysis, with 43 markers covering all 19 chromosomes and the X chromosome, as well as 5 markers that distinguish between the C57BL/6J and C57BL/6N substrains, was performed on the the males sent to The Jackson Laboratory Repository and our rederived living colony. Overall, 2-4 of the 43 markers throughout the genome were segregating. These data suggest the mice sent to The Jackson Laboratory Repository were on a mixed genetic background.

Allele

Symbol: Prdm1^em2Mbu
Name: endonuclease-mediated mutation 2, Meinrad Busslinger
MGI accession ID: MGI:7869398
Generation method: Endonuclease-mediated
Attributes: Epitope tag; Inducible degradation
Synonyms: Prdm1^AID
Marker symbol: Prdm1
Marker name: PR domain containing 1, with ZNF domain
Marker synonyms: b2b1765Clo; BLIMP1; Blimp-1; PRDI-BF1
Chromosome: 10
Strain of origin: (C57BL/6J x CBA/J)F1
Molecular note: A single guide RNA (5'-TGAAAATCTTAAGGATCCAT-3') was used to insert a glycine linker, a minimal auxin-inducible degron sequence and the V5 epitope in frame to the last amino acid sequence of the PR domain containing 1, with ZNF domain (Prdm1) gene on chromosome 10.

Allele

Symbol: Gt(ROSA)26Sor^{em2(CAG-LOC4337827*)Mbu}
Name: endonuclease-mediated mutation 2, Meinrad Busslinger
MGI accession ID: MGI:7703958
Generation method: Endonuclease-mediated
Attributes: Inserted expressed sequence
Synonyms: Rosa26^Tir1-F74G
Marker symbol: Gt(ROSA)26Sor
Marker name: gene trap ROSA 26, Philippe Soriano
Marker synonyms: beta geo; Gtrgeo26; Gtrosa26; R26; ROSA26; SETD5-AS1; Thumpd3as1
Chromosome: 6
Strain of origin: 129P2/OlaHsd
Molecular note: The CAG promoter drives a codon-optimized Oryza sativa F-box transport inhibitor response 1 (TIR1) sequence, linked to an N-terminal nuclear localization signal (NLS), an internal ribosome entry site (IRES) sequence and a puromycin cassette, inserted into intron 1 of the Gt(ROSA)26Sor locus. The allele was generated by introducing the F74G mutation into an existing Rosa26(Tir1) allele CRISPR-Cas9 methodology introduced the F74G mutation into an existing F-box transport inhibitor response 1 (TIR1) protein carried by the Gt(ROSA)26Sor^{tm2(CAG-LOC4337827)Afst} allele.