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Updated: Aug 24, 2026

Investigation of the Transcriptional Role of a RUNX1 Intronic Silencer by CRISPR/Cas9 Ribonucleoprotein in Acute Myeloid Leukemia Cells
Published on: September 1, 2019
Mechanism of transcriptional repression by TEL/RUNX1 fusion protein
Young Ju Lee1, Jae Hyun Kim, Seonghwan Bae
1Department of Biology, School of Life Sciences, Research Center for Bioresource and Health, Chungbuk National University, Cheongju 361-763, Korea.
Abstract:
Human chromosomal translocation t(12;21)(p12;q22) is one of the most frequent rearrangement in human leukemia, and produces the TEL/RUNX1 fusion protein. The TEL/RUNX1 fusion protein creates a transcriptional repressor that interferes in dominant fashion with RUNX1-dependent transactivation. Here, we demonstrate that the repressor activity of TEL/ RUNX1 differs from that of TEL, even though both TEL and TEL/RUNX1 interact with the nuclear hormone co-repressor (N-CoR) and histone deacetylase (mSin3A) in vivo. Co-immunoprecipitation experiments demonstrated that TEL/RUNX1 forms homodimers in vivo, and heterodimerizes with the TEL when the two proteins are expressed together. These interactions require the HLH (helix-loop-helix) region of TEL. Immunoprecipitation and immunofluorescence analysis showed that p300 interacts with TEL/RUNX1 and is sequestered in the cytoplasm by it. These results suggest that the p300-TEL/RUNX1 complex and heterodimerization of TEL/RUNX1 with TEL may be responsible for the ability of TEL/RUNX1 to inhibit RUNX1-mediated transactivation. It appears that loss of TEL function activates a pathway that cooperates with TEL/RUNX1 and sequesters coactivator(s) into nonfunctional complex in the cytoplasm thus inhibiting transcription of target genes.
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