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Ikaros DNA-binding proteins direct formation of chromatin remodeling complexes in lymphocytes.

Kim J., Sif S., Jones B., Jackson A., Koipally J., Heller E., Winandy S., Viel A., Sawyer A., Ikeda T., Kingston R., Georgopoulos K.

The Ikaros gene family encodes zinc finger DNA-binding proteins essential for lineage determination and control of proliferation in the lymphoid system. Here, we report that, in the nucleus of a T cell, a major fraction of Ikaros and Aiolos proteins associate with the DNA-dependent ATPase Mi-2 and histone deacetylases, in a 2 MD complex. This Ikaros-NURD complex is active in chromatin remodeling and histone deacetylation. Upon T cell activation, Ikaros recruits Mi-2/HDAC to regions of heterochromatin. These studies reveal that Ikaros proteins are capable of targeting chromatin remodeling and deacetylation complexes in vivo. We propose that the restructuring of chromatin is a key aspect of Ikaros function in lymphocyte differentiation.

Immunity 10:345-355(1999) [PubMed] [Europe PMC]

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