This targeted mutation of the integrin alpha 4 (Itga4) gene exhibits impaired lymphocyte transmigration and homing to the gut. This mutant mouse strain may be useful in studies of leukocyte migration and homing.
Motomu Shimaoka, Immune Disease Institute (formerly CBRI)
Mice homozygous for the targeted mutation are viable, fertile, normal in size and do not display any gross physical or behavioral abnormalities. Lymphocytes exhibit increased basal adhesiveness to VCAM1 and MAdCAM1 under physiological conditions as well as reduced transmigration across VCAM1 and MAdCAM1 substrates and endothelial monolayers under shear stress. Homing of mutant lymphocytes to the gut is reduced by approximately 50%. In addition, fewer lymphocytes are found in the gut and Peyer's Patches are smaller in size than wild-type. This mutant mouse strain may be useful in studies of leukocyte migration and homing.
A targeting vector was designed to contain exons 26 and 27, an engineered Xba1 site, an ACN cassette, and exon 28, respectively. Exon 28 contains nucleotide mutations to generate an amino acid substitution of alanine for arginine. The loxP-flanked ACN cassette contains the neomycin resistance gene and Cre recombinase gene under the control of the sperm-specific angiotensin-converting enzyme promoter. Cre-mediated recombination during spermatogenesis of chimeric males removes the cassette leaving a single loxP- site between exons 27 and 28. The construct was electroporated into C57BL/6-derived Bruce-4 embryonic stem (ES) cells. Correctly targeted ES cells were injected into BALB/c blastocysts, and the resulting chimeric males were crossed to C57BL/6 females. Homozygotes were generated and then maintained by intercross prior to arrival at The Jackson Laboratory.
|Allele Name||targeted mutation 1, Motomu Shimaoka|
|Allele Type||Targeted (Not Applicable)|
|Gene Symbol and Name||Itga4, integrin alpha 4|
|Promoter||Itga4, integrin alpha 4, mouse, laboratory|
|Strain of Origin||B6.Cg-Thy1a|
|Molecular Note||Exon 28 was replaced with one in which nucleotide substitutions resulted in amino acid substitution of GFFKA for GFFKR. This sequence is involved in the formation of a membrane-proximal salt bridge necessary for inactivation. A self-excising neo cassette was inserted upstream of exon 28 and subsequently deleted in chimeras.|
|Mutations Made By|| |
Motomu Shimaoka, Immune Disease Institute (formerly CBRI)
When maintaining a live colony, these mice are bred as homozygotes.
When using the C57BL/6-Itga4tm1Mshi/J mouse strain in a publication, please cite the originating article(s) and include JAX stock #010501 in your Materials and Methods section.
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