Strain Name:
MRL.Cg-Aicdatm1Diaz Faslpr/Mmnc
Stock Number:
Citation ID:
Other Names:

Gene Information

Gene Symbol: Aicda (Mus musculus (mouse))
Name: activation-induced cytidine deaminase
Synonyms: Aid
Chromosome: 6
Alteration at locus: Knockout
Monarch Initiative (Disease and Phenotype Associations): MGI:1342279
Allele Symbol: Faslpr (Mus musculus (mouse))
Name: Fas (TNF receptor superfamily member 6); lymphoproliferation
Synonyms: Tnfrf6, lpr, Tnfrsf6, Fas-def, Fas-, MRL/lpr, Tnfrsf6lpr
Chromosome: 19
Alteration at locus: Spontaneous Mutation
Monarch Initiative (Disease and Phenotype Associations): MGI:1856334
Genetic Alterations
knockout of AID (cytidine deaminase) involved in class switch recombination in B cells
Genotype Determination
  • Genotyping Protocol(s)
  • Center protocol and contact for technical support will be shipped with mice.
  • ES Cell Line
    TT2 derived from (C57BL/6 x CBA)F1

    Homozygous: B cells from these mice fail to class switch so mice do not develop IgG responses

    Hetero/Hemizygous: Immunization with NP-CGG (nitrophenol conjugated to chicken gamma globulin) yielded anNP-specific IgM antibody titer that was slightly higher in sera of AID-/- chimera than those of AID+/- chimera. However, no anti-NP IgG1 was produced by AID-/- chimera. MLN RNA (VH186.2-NP response) from AID+/- and AID-/- chimeras showed that AID+/- derived VH186.2 sequences of the mu and gamma1 chains carried comparable levels of mutation in the total and framework regions. However, CDR of the AID+/- gamma1 chain contained a 60% higher frequency of mutations than that of the AID+/- mu chain. R/S ratios were higher in CDR than framework region of both mu and gamma1 chains of AID+/- VH186.2 sequences. Furthermore, AID+/- VH186.2 sequences of the gamma1 chain contained, more frequently than those of the mu chain, the characteristic mutation at 33Trp (TGG) to 33Leu (TTG), which is known to be responsible for high-affinity binding to the NP hapten By contrast, AID-/- mu chains contained 10 times fewer mutations than AID+/- mu chain. There were no mutations in CDR 1 and CDR 2 of the AID-/- VH186.2 mu chain. The mutation frequency (1.5 x 10e-3) of AID-/- VH186.2 sequences was comparable to that due to PCR by Taq.

    Cre-excised Phenotype:

    Mammalian Phenotype Terms
    Allelic Composition: Faslpr/Faslpr (Genetic Background: AK.MRL-Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: B6.Cg-Apoetm1Unc Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: B6.MRL-Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: B6.MRL-Faslpr/J )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: C3.MRL-Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: C3.MRL-Faslpr/J )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: involves: 129P2/OlaHsd * MRL )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: involves: C3H * MRL/Mp )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: involves: C57BL/6 * MRL/Mp )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: involves: MRL/Mp )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: MRL-Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: MRL.Cg-Irf1tm1Mak Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: MRL.Cg-Tnfrsf9tm1Byk Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: MRL/Mp-Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: MRL/Mp-Faslpr atms )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: MRL/MpJ-Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: MRL/MpJ-Faslpr/J )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: NOD.MRL(B6)-Faslpr )

    Allelic Composition: Faslpr/Faslpr (Genetic Background: NOD.MRL-Faslpr )

    Allelic Composition: Faslpr/Fastm1.1Cgn (Genetic Background: involves: C57BL/6 * MRL )

    MeSH Terms
      Strain Development

      In this strain, activation-induced cytidine deaminase (Aicda Gene ID 116298) was disrupted. To that end TT2 embryonic stem cells (strain of origin: (C57BL/6NCrlj x CBA/JNCrlj)F1) were electroporated with a target vector (see Fig. 2A in PMID:11007474) designed to replace exon 2 and the 5’ half of exon 3 with the neomycin resistance (NeoR) gene. Homologous integration was confirmed by PCR screening and Southern blot hybridization. ES cells were injected into ICR 8-cell embryos and implanted into pseudopregnant females. The resulting founder chimeras were crossed into C57BL/6 background to generate C57BL/6-Aicda‑/-mice, which were further crossed to MRL/MpJ-Faslpr/J(“MRL/lpr” - JAX Stock #000485) for 12 generations, then intercrossed to generate final strain. To prevent MRL/lpr drift, the animals were backcrossed to JAX Stock #000485 every 2 years.

      Suggested Control Mice
      Wild-type littermates
      • Immunology and Inflammation
      • Models for Human Disease
      • Obesity
      • Research Tools
      Marilyn Diaz, Ph.D., U.S. Department of Health and Human Services.
      Barbara Vilen, Ph.D., University of North Carolina at Chapel Hill.

      Colony and Husbandry Information

      Colony Surveillance Program and Current Health Reports

      Mice recovered from a cryo-archive will have health surveillance performed on recipient females. Health reports will be provided prior to shipment. If you require additional health status information, please email .
      Coat Color
      females only breed for approximately 2 litters so need to change out breeders frequently
      MMRRC Breeding System
      Random intra-strain mating
      Breeding Scheme(s)
      to prevent MRL/lpr drift we backcross the mice to (MRL/MpJ-Tnfrs6lpr/J (MRL/lpr; JAX stock number 000485) every 2 years.
      Overall Breeding Performance
      Viability and Fertility: Female Male Comments
      Homozygotes are viable: Yes Yes
      Homozygotes are fertile: Yes Yes
      Heterozygotes are fertile: Yes Yes
      Age Reproductive Decline: Less than 4 months 4 to 6 months
      Average litter size
      Recommended wean age
      3 weeks

      Order Request Information

      Limited quantities of breeder mice (recovered litter) are available from a cryoarchive; recovered litter usually available to ship in 3 to 4 months.

      Distribution of this strain requires submission of the MMRRC Conditions of Use (COU). A link to the COU web form will be provided via email after an order has been placed; the form should be completed then or the email forwarded to your institutional official for completion.

      The donor or their institution limits the distribution to non-profit institutions only.

      Additional charges may apply for any special requests. Shipping costs are in addition to the basic distribution/resuscitation fees. Information on shipping costs and any additional charges will be provided by the supplying MMRRC facility.

      Click button to Request this one strain. (Use the MMRRC Catalog Search to request more than one strain.)
      MMRRC Item # Description Distribution Fee / Unit (US $) Units Notes
      043606-UNC-RESUS Litter recovered from cryo-archive $2,829.00 / Non-Profit Litter Recovered litter1; additional fees for any special requests.

      Some MMRRC strains were submitted by the donor as cryopreserved germplasm, and because these strains were not cryopreserved by the MMRRC, we have not assessed the quality of this material. We have extensive experience with recovery of mice from cryopreserved sperm and embryos of varying quality, including using techniques such as IVF and ICSI, and are confident that we will have success in most, if not all, cases. However, because of the unknown quality of these frozen samples, we will restrict recovery efforts to two attempts for each order. Subsequent attempts can be performed on a fee-for-service basis, in addition to the standard fees, upon request.

      1 The distribution fee covers the expense of resuscitating mice from the cryo-archive; you will receive the resulting litter. The litter will contain at minimum one mutant carrier; the actual number of animals and the gender and genotype ratios will vary. (Typically, multiple breeder pairs can be established from the recovered litter.) Prior to shipment, the MMRRC will provide information about the animals recovered. If you anticipate or find that you need to request specific genotypes, genders or quantities of mice in excess of what is likely from a resuscitated litter, you may discuss available options and pricing with the supplying MMRRC facility.

      2 An aliquot is one straw or vial with sufficient sperm to recover at least one litter of mice, as per provided protocols, when performed at the MMRRC facility. The MMRRC makes no guarantee concerning the success of these procedures when performed outside the MMRRC facilities.

      3 An aliquot contains a sufficient number of embryos (in one or more vials and based on the transfer success rate of the MMRRC facility) to transfer to at least two recipients. The MMRRC makes no guarantee concerning embryo transfer success experienced in the recipient investigator's laboratory. Neither gender nor genotype ratios are guaranteed.

      To request material from the MMRRC: Please fill out our on-line request form (accessible from the catalog search results page, or click the Request this Strain button in the fees section). If you have questions or need assistance completing this form, you may call Customer Service at (800) 910-2291 (in USA or Canada) or (530) 757-5710 (international calls). Before you call, please have with you: the MMRRC item number, quantity needed, Bill-to and Ship-to contact information.