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Subset of genes targeted by transcription factor NF-κB in TNFα-stimulated human HeLa cells

Yujun Xing1, Fei Zhou, Jinke Wang

  • 1The State Key Laboratory of Bioelectronics, Southeast University, Nanjing, 210096, People's Republic of China.

Functional & Integrative Genomics
|December 19, 2012
PubMed

Insights

This study identified 584 direct target genes of Nuclear factor κB (NF-κB) in TNFα-stimulated HeLa cells. Most identified genes showed cell- or stimulus-specific regulation, highlighting the need for diverse experimental conditions.

Area of Science:

  • Molecular Biology
  • Genomics
  • Cellular Biology

Background:

  • Nuclear factor κB (NF-κB) is a crucial transcription factor regulating diverse cellular processes, including growth, differentiation, apoptosis, and cancer.
  • High-throughput techniques like ChIP have identified NF-κB target genes, but results vary significantly across cell lines and stimuli.
  • This variability necessitates investigating different cellular contexts to comprehensively map NF-κB's regulatory network.

Purpose of the Study:

  • To identify direct target genes (DTGs) of NF-κB in TNFα-stimulated HeLa cells.
  • To characterize the activation and repression patterns of these DTGs.
  • To analyze the presence of canonical and non-canonical κB motifs within the identified target gene regulatory regions.

Main Methods:

  • Chromatin immunoprecipitation sequencing (ChIP-Seq) to identify DNA regions bound by NF-κB.
  • RNA interference (RNAi) to validate the functional role of NF-κB in gene regulation.
  • Gene expression profiling to quantify changes in target gene expression.
  • Bioinformatic analysis for motif searching within ChIP-Seq peaks.

Main Results:

  • Identified 584 direct target genes (DTGs) of NF-κB in TNFα-stimulated HeLa cells.
  • Of the 584 DTGs, 266 were activated and 318 were repressed by NF-κB.
  • Analysis revealed that 50% of these genes contained canonical κB sites and 90% contained non-canonical κB sites within their ChIP peaks.
  • Comparison with other studies showed minimal overlap in target genes across different cell lines and stimuli, with only two genes (NFKB2 and STAT5A) commonly shared across three conditions.

Conclusions:

  • TNFα stimulation in HeLa cells leads to specific regulation of 584 direct NF-κB target genes.
  • The majority of NF-κB target genes exhibit cell- and stimulus-specific binding and regulation.
  • The presence of non-canonical κB motifs is prevalent in NF-κB-bound regions, suggesting a broader recognition mechanism than previously thought.
  • Comprehensive identification of NF-κB's regulatory network requires integrating data from diverse cell types and stimuli.

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