Related Experiment Video
Updated: Jul 14, 2026

In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing
Published on: May 5, 2023
Functional sequestration of transcription factor activity by repetitive DNA
Xiaowei Liu1, Bo Wu, Jaroslaw Szary
1Diabetes Center and Department of Medicine, University of California, San Francisco, California 94143, USA.
Repetitive DNA can bind transcription factors like CCAAT/enhancer-binding protein alpha (C/EBPalpha), sequestering it in heterochromatin. This binding reduces available C/EBPalpha for gene regulation, impacting transcription output.
Area of Science:
- * Molecular Biology
- * Genomics
- * Epigenetics
Background:
- * Eukaryotic genomes contain extensive repetitive DNA sequences.
- * Repetitive DNA is often localized in transcriptionally silent heterochromatin.
- * The regulatory role of repetitive DNA in transcription is not fully understood.
Purpose of the Study:
- * To investigate the interaction between transcription factor C/EBPalpha and mouse major alpha-satellite repetitive DNA.
- * To determine if binding to repetitive DNA affects C/EBPalpha's transcriptional activity.
- * To explore the mechanism of C/EBPalpha sequestration in heterochromatin.
Main Methods:
- * Assessing C/EBPalpha binding to alpha-satellite DNA in mouse cells.
- * Manipulating C/EBPalpha binding via Pit-1 co-expression and site-specific mutations.
- * Quantifying C/EBPalpha localization within the nucleus (heterochromatic vs. non-heterochromatic compartments).
- * Measuring C/EBPalpha binding to gene promoters and subsequent transcriptional output.
Main Results:
- * C/EBPalpha binds to mouse major alpha-satellite repetitive DNA, leading to its sequestration in pericentromeric heterochromatin.
- * Reducing C/EBPalpha binding to alpha-satellite DNA increases its availability for promoter binding and gene transcription.
- * Co-expression of Pit-1 or introducing an altered-specificity C/EBPalpha mutant releases C/EBPalpha from heterochromatin, enhancing gene transcription.
Conclusions:
- * Binding of C/EBPalpha to repetitive DNA acts as a sequestration mechanism, limiting its availability for transcriptional regulation.
- * Functional sequestration of transcription factors by repetitive DNA is a potential, underappreciated mechanism controlling gene expression.
- * Repetitive DNA elements can indirectly influence gene transcription by modulating transcription factor availability.
More Related Videos
10:28Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
Published on: September 20, 2018
13:47Lentiviral Vector Platform for the Efficient Delivery of Epigenome-editing Tools into Human Induced Pluripotent Stem Cell-derived Disease Models
Published on: March 29, 2019
Related Concept Videos
RNA Polymerase II Accessory Proteins
Co-activators and Co-repressors
Cooperative Binding of Transcription Regulators
Cooperative Binding of Transcription Regulators
Eukaryotic Transcription Inhibitors
Eukaryotic transcription inhibitors usually contain two distinct domains, a DNA...
DNA Packaging