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Lineageduring Commitment to the Lymphoid Cells Expression in Hematopoietic Progenitor E2F4 Modulates Differentiation and Gene

The E2F4 protein is involved in gene repression and cell cycle exit, and also has poorly understood effects in differentiation. We analyzed the impact of E2F4 deﬁciency on early steps in mouse hemopoietic development, and found defects in early hemopoietic progenitor cells that were propagated through common lymphoid precursors to the B and T lineages. In contrast, the defects in erythromyeloid precursor cells were self-correcting over time. This suggests that E2F4 is important in early stages of commitment to the lymphoid lineage. The E2F4-deﬁcient progenitor cells showed reduced expression of several key lymphoid-lineage genes, and overexpression of two erythromyeloid lineage genes. However, we did not detect effects on cell proliferation. These ﬁndings emphasize the signiﬁcance of E2F4 in controlling gene expression and cell fate. The Journal of Immunology, 2008, 180: 3699–3707.