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Updated: Jan 25, 2026
Describing a Transcription Factor Dependent Regulation of the MicroRNA Transcriptome
Published on: June 15, 2016
Regulation of Krüppel-Like Factor 4 (KLF4) expression through the transcription factor Yin-Yang 1 (YY1) in
Mario Morales-Martinez1,2, Alberto Valencia-Hipolito1, Gabriel G Vega1,2
1Molecular Signal Pathway in Cancer Laboratory, UIMEO, Oncology Hospital, Siglo XXI National Medical Center, IMSS, México City, México.
Abstract:
Krüppel-Like Factor 4 (KLF4) is a member of the KLF transcription factor family, and evidence suggests that KLF4 is either an oncogene or a tumor suppressor. The regulatory mechanism underlying KLF4 expression in cancer, and specifically in lymphoma, is still not understood. Bioinformatics analysis revealed two YY1 putative binding sites in the KLF4 promoter region (-950 bp and -105 bp). Here, the potential regulation of KLF4 by YY1 in NHL was analyzed. Mutation of the putative YY1 binding sites in a previously reported system containing the KLF4 promoter region and CHIP analysis confirmed that these binding sites are important for KLF4 regulation. B-NHL cell lines showed that both KLF4 and YY1 are co-expressed, and transfection with siRNA-YY1 resulted in significant inhibition of KLF4. The clinical implications of YY1 in the transcriptional regulation of KLF4 were investigated by IHC in a TMA with 43 samples of subtypes DLBCL and FL, and all tumor tissues expressing YY1 demonstrated a correlation with KLF4 expression, which was consistent with bioinformatics analyses in several databases. Our findings demonstrated that KLF4 can be transcriptionally regulated by YY1 in B-NHL, and a correlation between YY1 expression and KLF4 was found in clinical samples. Hence, both YY1 and KLF4 may be possible therapeutic biomarkers of NHL.
Insights
Krüppel-Like Factor 4 (KLF4) is regulated by YY1 in B-cell lymphoma. This discovery suggests YY1 and KLF4 could be potential therapeutic biomarkers for Non-Hodgkin Lymphoma (NHL).
Area of Science:
- Molecular Biology
- Oncology
- Gene Regulation
Background:
- Krüppel-Like Factor 4 (KLF4) has a dual role as an oncogene or tumor suppressor, but its regulation in cancer, particularly lymphoma, is unclear.
- Understanding KLF4 regulation is crucial for developing targeted therapies for B-cell malignancies.
Purpose of the Study:
- To investigate the potential transcriptional regulation of KLF4 by YY1 in Non-Hodgkin Lymphoma (NHL).
- To explore the clinical relevance of the YY1-KLF4 interaction in B-NHL subtypes.
Main Methods:
- Bioinformatics analysis to identify YY1 binding sites in the KLF4 promoter.
- Reporter assays and Chromatin Immunoprecipitation (ChIP) to confirm binding site functionality.
- siRNA-mediated knockdown of YY1 in B-NHL cell lines.
- Immunohistochemistry (IHC) on a tissue microarray (TMA) of DLBCL and FL samples.
Main Results:
- Bioinformatics identified two functional YY1 binding sites in the KLF4 promoter.
- YY1 knockdown significantly inhibited KLF4 expression in B-NHL cell lines.
- A positive correlation between YY1 and KLF4 expression was observed in clinical DLBCL and FL samples.
Conclusions:
- KLF4 is transcriptionally regulated by YY1 in B-cell NHL.
- The co-expression of YY1 and KLF4 in clinical samples suggests their potential as therapeutic biomarkers for NHL.
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