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Mmp20: Sequence encompassing a portion of intron 4 and all of exon 5 was replaced with a Hprt minigene inserted by homologous recombination. The deleted region encoded the conserved zinc-binding site of the catalytic domain. Northern blot analysis of total RNA obtained from homozygous mutant incisor homogenates indicated a lack of transcript containing exon 5. Enamelysin activity was undetected by zymography of proteins isolated from molars of postnatal homozygous mutant mice.
Klk4: The genomic sequence spanning the initiation codon in exon 2 through exon 6 was replaced with an NLS-lacZ and floxed neo cassette. The neo cassette was subsequently removed by germ line, cre mediated recombination. This allele lacks the entire coding region.
Mmp20 allele: HM-1 derived from 129P2/OlaHsd-Hprtb-m3
Klk4 allele: Bruce 4 derived from B6.Cg-Thy1a
Homozygous: Enamel defect; chalky white in color and easily fractured. Otherwise no apparent physical anomalies.
Heterozygous: No gross defects
Please note that double knockout strain has not been published but there are many publications reporting each of the single knockout model and their comparisons. Simmer JP, Hu Y, Lertlam R, Yamakoshi Y, Hu JC. Hypomaturation enamel defects in Klk4 knockout/LacZ knockin mice. J Biol Chem. 2009 Jul 10;284(28):19110-21. Epub 2009 May 6. (Medline PMID: 19578120).
Caterina JJ, Skobe Z, Shi J, Ding Y, Simmer JP, Birkedal-Hansen H, Bartlett JD. Enamelysin (matrix metalloproteinase 20)-deficient mice display an amelogenesis imperfecta phenotype. J Biol Chem. 2002 Dec 20;277(51):49598-604. Epub 2002 Oct 21. (Medline PMID: 12393861).
Effect of kallikrein 4 loss on enamel mineralization: comparison with mice lacking matrix metalloproteinase 20. Smith CE, Richardson AS, Hu Y, Bartlett JD, Hu JC, Simmer JP. J Biol Chem. 2011 May 20;286(20):18149-60. Epub 2011 Mar 23. (Medline PMID: 21454549).
Colony Surveillance Program and Current Health Reports
Sib-mating
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 mmrrc@ucdavis.edu 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.