Abstract
Transgenic mice were produced containing a 33 kilobase (kb) DNA fragment encompassing the five exons and all the known regulatory regions of the class IIHLA-DRA gene. The transgene displayed regulated expression [constitutive and interferon-γ (IFN)-γ induced] of the human products in most mouse tissues. The tissue distribution of theDRA transgene products more closely resembled that of their mouse homologues, the endogenous H-2 Ea products, than the wider distribution ofDRA products in humans. This was evident in several tissues (endothelia of small vessels, especially those of glomerular capillaries, Kupffer cells, and epithelial cells lining the gastrointestinal tract), known to differentially express class II molecules in the two species. Thus, the wider human specific pattern of expression requires an exact cis/trans complementation which is incompletely reconstituted in transgenic mice, suggesting that human specific cis-acting elements may have arisen during evolution to direct the expression of class II genes to those anatomical regions which usually lack them in the mouse. The only example of aberrant expression of theDRA gene in the present series of transgenic mice was in the dendritic and/or epithelial cells of the thymic cortex, which displayed greately reducedDRA levels in spite of a normal expression of the endogenous Ea molecules.
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Giacominil, P., Ciucci, A., Nicotra, M.R. et al. Tissue-specific expression of theHLA-DRA gene in transgenic mice. Immunogenetics 34, 385–391 (1991). https://doi.org/10.1007/BF01787489
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DOI: https://doi.org/10.1007/BF01787489