Fbxl10T mice may be useful in studying the role of DNA methylation during embryonic development.
Timothy H. Bestor, Columbia University
Genetic Background | Generation |
---|---|
|
Allele Type | Gene Symbol | Gene Name |
---|---|---|
Gene trapped (Reporter, Null/Knockout) | Kdm2b | lysine (K)-specific demethylase 2B |
Fbxl10T mice have a gene trap cassette, consisting of a β-geo sequence (a β-galactosidase reporter (lacZ) fused to a neomycin resistance cassette), inserted downstream the exon encoding the CXXC motif of the lysine (K)-specific demethylase 2B (Kdm2b) gene (also termed Fbxl10). The trap cassette is inserted into exon 13 of Fbxl10-1 (corresponding to exon 2 of Fbxl10-2). The long form of FBXL10 (FBXL10-1) encodes a histone demethylase that demethylates Lys-4 and Lys-36 of histone H3. The short form, FBXL10-2 lacks the histone demethylase domain but has the same C-terminus of FBXL10-1 composed of CXXC, PHD, leucine rich and F-box domains. Both FBXL10 isoforms binds to all unmethylated CpG-dense promoters through their common CXXC motif. FBXL10 acts by binding to the transcribed region of ribosomal RNA and repressing the transcription of ribosomal RNA genes which inhibits cell growth and proliferation. FBXL10 has also been reported to be an oncogene and a tumor suppressor in leukemia. Complete inactivation of the Fbxl10 gene leads to methylation only of promoters that are co-occupied by both FBXL10 and Polycomb repressive complexes (PRCs). The targeted mutation in this strain results in the truncation of both Fbxl10-1 and Fbxl10-2 isoforms. The PHD, F-box and leucine-rich repeat domains that are crucial for the incorporation of FBXL10 into polycomb repressive complex (PRC1) are not detectable in homozygotes. Small amounts of RNA encoded by the two exons of Fbxl10-2 upstream of the insertion site are present and translated into an exclusively cytoplasmic peptide. FBXL10-1 and FBXL10-2 proteins are undetectable in the homozygous Fbxl10T/T mutants.
Homozygotes are embryonic lethal before E10.5 due to open and malformed anterior neural tube, a kinked and tortuous posterior neural tube, abnormal somitogenesis, heart defects and reduced size. Heterozygous mice are viable and fertile and born at Mendelian ratios. Hypermethylation of DNA is targeted to the promoters of the large families of Hox, Tbx, and other genes whose products are involved in the regulation of early embryonic development. These mice exhibit extreme sexual dimorphism, with more severe gene dysregulation in mutant female embryos due to dysregulation of X-linked genes.
BayGenomics gene trap ES cell line, RRT043, generated in 129P2/OlaHsd-derived embryonic stem cells, was used to insert a β-geo sequence (a β-galactosidase reporter (lacZ) fused to a neomycin resistance cassette) downstream of the CXXC domain downstream of exon 2 of the lysine (K)-specific demethylase 2B (Kdm2b) gene. This gene trap results in truncation of both Fbxl10-1 and Fbxl10-2 isoforms. Correctly targeted ES cells were injected into recipient blastocysts and chimeric Fbxl10T mice were backcrossed to FVB/NJ mice for at least 16 generations. Upon arrival at The Jackson Laboratory, sperm was cryopreserved. To establish our live colony, an aliquot of frozen sperm was used to fertilize FVB/NJ oocytes (Stock No. 001800).
Allele Name | gene trap RRT043, BayGenomics |
---|---|
Allele Type | Gene trapped (Reporter, Null/Knockout) |
Allele Synonym(s) | Fbxl10T; RTT043 |
Gene Symbol and Name | Kdm2b, lysine (K)-specific demethylase 2B |
Gene Synonym(s) | |
Strain of Origin | 129P2/OlaHsd |
Chromosome | 5 |
Molecular Note | Trapped gene association determined by genome coordinate overlap and strand. |
When maintaining a live colony, heterozygous mice may be bred to wildtype mice from the colony or FVB/NJ inbred mice (Stock No. 001800). Homozygous mice are embryonic lethal before E10.5 due to open and malformed anterior neural tube, a kinked and tortuous posterior neural tube, abnormal somitogenesis, heart defects and reduced size.
When using the Fbxl10T mouse strain in a publication, please cite the originating article(s) and include JAX stock #029344 in your Materials and Methods section.
Facility Barrier Level Descriptions
Service/Product | Description | Price |
---|---|---|
Please inquire |
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 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. We do not guarantee breeding performance and therefore suggest that investigators order more than one breeding pair to avoid delays in their research.
What information were you hoping to find through your search?
How easy was it to find what you were looking for?
We may wish to follow up with you. Enter your email if you are happy for us to connect and reachout to you with more questions.
Please Enter a Valid Email Address
Thank you for sharing your feedback! We are working on improving the JAX Mice search. Come back soon for exciting changes.