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The human transcription factor CP2 (TFCP2), a component of the human gamma-globin stage selector protein, maps to chromosome region 12q13 and is within 250 kb of the NF-E2 gene.

The transcription factor CP2{sup 2} has been shown to bind to several cellular and viral promoters as a homodimer. More recently, we have demonstrated that CP2 can form a heterodimer with a 45-kDa partner protein to form the stage selector protein complex (SSP). This complex binds to a proximal {gamma}-globin promoter regulatory element, the stage selector element (SSE), which appears to be involved in the competitive silencing of the {beta}-gene in the fetal stage of erythropoiesis. Similar SSP-like binding sites have been identified in the {beta}-globin promoter and regulatory elements of the {beta}-globin locus control region (LCR). The importance of the SSP complex is further emphasized by the fact that the chicken stage selector protein, NF-E4, which has been implicated in the competitive silencing of the chicken {epsilon}-globin gene, is the avian homologue of CP2. The purpose of this study is to map human CP2 genomically and define its relationship to previously identified loci. 9 refs., 1 fig.