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Identification and characterization of SKAT-2, a novel Th2-specific zinc finger gene

✍ Scribed by Andy D. Blanchard; Kevin R. Page; Harriet Watkin; Penny Hayward; Tony Wong; Michelle Bartholomew; Diana J. Quint; Maria Daly; Jorge Garcia-Lopez; Brian R. Champion

Publisher
John Wiley and Sons
Year
2000
Tongue
English
Weight
333 KB
Volume
30
Category
Article
ISSN
0014-2980

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✦ Synopsis

We have identified a novel Kruppel-type zinc finger (ZF) gene, SKAT-2, which is selectively expressed by murine Th2 cells. The protein encoded by this gene has 14 C2H2-type ZF tandemly arrayed at its C terminus and N-terminal SCAN box and KRAB domains. SKAT-2 is tissue restricted in expression at the RNA level, detectable only in brain and at low levels in kidney and spleen and few hematopoietic cell lines. By in situ hybridization, SKAT-2 expression was found to peak in antigen-stimulated CD4 + T cells after 2-3 days of culture under Th2 but not Th1 biasing conditions. This pattern of expression closely mirrored that of GATA-3 in the same cells. In transient transfection experiments in phorbol 12-myristate 13-acetate/ ionomycin-stimulated EL4 cells, SKAT-2 was found to up-regulate the activity of the IL-4 but not the IL-5 promoter, contrasting with the ability of GATA-3 to activate both promoters. This result was confirmed using clones of EL4 cells stably expressing an inducible form of SKAT-2, thus SKAT-2 is a novel Th2-specific gene that may play a role in selective regulation of cytokine genes in T cells.

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