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These double knockout mice exhibit reduced lean body mass, shortened body length, an abnormally large eyelid opening (macroblepharon), and darkened back fur. They may be useful for studying the involvement of H2A histones in the regulation of gene expression.
Macroh2a1 (H2afy) and Macroh2a2 (H2afy2) or macroH2A1/2 (H2A histone family, member Y and Y2, respectively), encode an alternative H2A histone that includes a unique C-terminal non-histone domain. The macroH2A histones function in a subset of nucleosomes where they are involved in the regulation of gene expression. Mice homozygous for both alleles are viable and fertile, but exhibit reduced lean body mass and are shorter in length than wild type controls. Mice remain small throughout adulthood. On the 129S6 background, double KO mice exhibit an abnormally large eyelid opening (macroblepharon), some eyelid inflammation, and darkened fur on the back (by 6 weeks of age). Double mutant mice on the C57BL/6 background breed poorly by either failing to reproduce or exhibiting high rates (29%) of perinatal lethality. This strain may be useful for studying the involvement of H2A histones in the regulation of gene expression.
Changolkar LN, Costanzi C, Leu NA, Chen D, McLaughlin KJ and Pehrson JR. Developmental changes in histone macroH2A1-mediated gene regulation. Mol Cell Biol. 2007 Apr;27(7):2758-64. Epub 2007 Jan 22. (Medline PMID:17242180)
Cryo-recovered strains distributed by the MMRRC at JAX are shipped to the customer from the Pathogen & Opportunistic-Free Animal Room G200 - see https://www.jax.org/jax-mice-and-services/customer-support/customer-service/animal-health/health-status-reports.
Limited quantities of breeder mice (recovered litter) are available from a cryoarchive; recovered litter usually available to ship in 3 to 4 months.
Cryopreserved material may be available upon request, please inquire to csmmrrc@jax.org for more information.
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.
1 The distribution fee covers the expense of rederiving mice from a live mouse; 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 contains a sufficient number of embryos (in one or more vials or straws and based on the transfer success rate of the MMRRC facility) to transfer into one to three recipients. The MMRRC makes no guarantee concerning embryo transfer success experienced in the recipient investigator's laboratory. Neither gender nor genotype ratios are guaranteed.
3 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.
4 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.