Examining NF-κB genomic interactions by ChIP-seq and CUT&Tag

Area of Science:

• Molecular Biology
• Genomics
• Epigenetics

Background:

• Understanding transcription factor (TF) coordination of gene regulation necessitates genome-wide mapping of TF-DNA interactions.
• Chromatin immunoprecipitation-sequencing (ChIP-seq) and CUT&Tag identify thousands of TF interactions but lack functional context.
• Optimizing ChIP-seq is often limited to specific sites due to cost and time.

Purpose of the Study:

• To investigate the impact of chemical crosslinking reagent titration on genome-wide ChIP-seq results for NF-κB family members RelA and c-Rel.
• To compare the outcomes of ChIP-seq and CUT&Tag experiments for these transcription factors.
• To assess how experimental conditions influence the detection and characteristics of TF genomic interactions.

Main Methods:

• Genome-wide ChIP-seq experiments were performed with varying concentrations of two chemical crosslinking reagents.
• The NF-κB family transcription factors RelA and c-Rel were studied.
• ChIP-seq results were compared with those obtained from CUT&Tag experiments.

Main Results:

• ChIP-seq experimental conditions profoundly affected the number of detected interactions and DNA motif enrichment.
• The proximity of detected interactions to potential target genes varied based on experimental parameters.
• While ChIP-seq and CUT&Tag showed consistency, a significant portion of interactions were unique to each method.
• Titration of crosslinking reagents demonstrated a substantial impact on RelA and c-Rel binding site identification.

Conclusions:

• Experimental conditions critically influence genome-wide transcription factor binding analyses.
• Differences in detected interactions between ChIP-seq and CUT&Tag highlight the need for careful method selection and optimization.
• Further investigation is required to understand the functional significance of condition-dependent variations in TF binding data.