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Ikaros family members are important regulatory factors in lymphocyte development. Here we show that Ikaros may play an important role in CD4 versus CD8 lineage commitment decisions by demonstrating: (1) that it binds to regulatory elements in the endogenous CD8α locus in vivo using thymocyte chromatin immunoprecipitations, (2) that Ikaros suppresses position effect variegation of transgenes driven...
CD4 and CD8 are crucial for the development and function of T cells. An intergenic deoxyribonuclease I hypersensitive site region (cluster CIII) directs expression in mature CD8 T cells only. Here, we show that two further independent regions from the CD8 gene locus in conjunction with cluster CIII restore transgene expression in appropriate immature thymocytes. Deletion of two of the intergenic cluster...
The coreceptors CD4 and CD8 play a crucial role during thymocyte development and T cell effector function, and their expression is developmentally regulated. To determine the underlying molecular mechanisms of CD8 gene regulation we cloned the murine CD8 gene locus from genomic libraries and analyzed this region for deoxyribonuclease (DNase I) hypersensitive sites (HSS). Here we report, using transgenic...
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