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General Transcription Factors

General Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

Cell Specific Gene Expression

Cell Specific Gene Expression

Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...

Master Transcription Regulators

Master Transcription Regulators

Master transcription regulators are regulatory proteins that are predominantly responsible for regulating the expression of multiple genes. Often these genes work in concert to drive a complex process. Activation of a master transcription regulator can lead to a cascade of transcriptional activation necessary for that outcome. These regulators can directly bind to the regulatory sequences of the various genes involved, or they can indirectly regulate transcription by binding to regulatory...

RNA Polymerase II Accessory Proteins

RNA Polymerase II Accessory Proteins

Proteins that regulate transcription can do so either via direct contact with RNA Polymerase or through indirect interactions facilitated by adaptors, mediators, histone-modifying proteins, and nucleosome remodelers. Direct interactions to activate transcription is seen in bacteria as well as in some eukaryotic genes. In these cases, upstream activation sequences are adjacent to the promoters, and the activator proteins interact directly with the transcriptional machinery. For example, in...

Transcription Factors

Transcription Factors

Tissue-specific transcription factors contribute to diverse cellular functions in mammals. For example, the gene for beta globin, a major component of hemoglobin, is present in all cells of the body. However, it is only expressed in red blood cells because the transcription factors that can bind to the promoter sequences of the beta globin gene are only expressed in these cells. Tissue-specific transcription factors also ensure that mutations in these factors may impair only the function of...

Combinatorial Gene Control

Combinatorial Gene Control

Combinatorial gene control is the synergistic action of several transcriptional factors to regulate the expression of a single gene. The absence of one or more of these factors may lead to a significant difference in the level of gene expression or repression.
The expression of more than 30,000 genes is controlled by approximately 2000-3000 transcription factors. This is possible because a single transcription factor can recognize more than one regulatory sequence. The specificity in gene...

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Related Experiment Video

Updated: May 18, 2026

Identifying Transcription Factor Olig2 Genomic Binding Sites in Acutely Purified PDGFRα+ Cells by Low-cell Chromatin Immunoprecipitation Sequencing Analysis

Identifying Transcription Factor Olig2 Genomic Binding Sites in Acutely Purified PDGFRα+ Cells by Low-cell Chromatin Immunoprecipitation Sequencing Analysis

Published on: April 16, 2018

A highly integrated and complex PPARGC1A transcription factor binding network in HepG2 cells.

Alexandra E Charos¹, Brian D Reed, Debasish Raha

¹Department of Molecular, Cellular, and Developmental Biology, Yale University, New Haven, Connecticut 06520, USA.

Genome Research

|September 8, 2012

Summary

This study reveals the core transcriptional network of PPARGC1A, a key regulator of energy metabolism. It uncovers how combinations of transcription factors (TFs) control gene expression, offering insights into metabolic diseases like type II diabetes.

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Area of Science:

Molecular Biology
Genomics
Systems Biology

Background:

PPARGC1A is a crucial coactivator for energy metabolism gene regulation.
Its role in human diseases, especially type II diabetes, is significant.
Understanding the combinatorial action of PPARGC1A with its partners is limited.

Purpose of the Study:

To map the genome-wide PPARGC1A regulatory network in HepG2 cells.
To investigate the combinatorial binding and network connectivity of PPARGC1A with its transcription factor (TF) partners.
To elucidate the regulatory code governing metabolic gene expression.

Main Methods:

Chromatin immunoprecipitation followed by high-throughput sequencing (ChIP-seq) to map genome-wide binding sites.
Identification of overrepresented DNA sequence motifs for PPARGC1A network partners.
ChIP-seq profiling of six site-specific TF partners and analysis of their combinatorial binding with PPARGC1A.

Main Results:

A core PPARGC1A transcriptional regulatory network was identified.
Extensive target overlap was observed, including a novel link between PPARGC1A and Heat Shock Factor 1 (HSF1).
Distinct TF combinations bound to specific functional gene sets, revealing a combinatorial regulatory code for metabolic processes.

Conclusions:

The study provides a framework for understanding systems-level control of metabolic gene expression.
Combinatorial TF binding dictates distinct functional gene regulation.
The identified network and novel PPARGC1A-HSF1 link offer new insights into metabolic regulation and disease.