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Overexpressing Long Noncoding RNAs Using Gene-activating CRISPR
Published on: March 1, 2019
A distal conserved sequence element controls Ifng gene expression by T cells and NK cells
Robin D Hatton1, Laurie E Harrington, Rita J Luther
1Department of Pathology, University of Alabama at Birmingham, Birmingham, AL 35294, USA.
Immunity
|October 31, 2006
Summary
A newly identified DNA region, CNS-22, is crucial for regulating interferon gamma (Ifng) gene expression. This element is essential for Ifng production in both adaptive and innate immune cells.
Area of Science:
- Immunology
- Molecular Biology
- Genetics
Background:
- Interferon gamma (Ifng) is a critical cytokine for immune responses.
- The precise epigenetic mechanisms controlling Ifng gene expression remain incompletely understood.
- Identifying regulatory elements is key to understanding immune cell function.
Purpose of the Study:
- To identify and characterize novel regulatory elements controlling Ifng gene expression.
- To investigate the role of conserved noncoding sequences (CNSs) in Ifng regulation.
- To determine the cell-type specificity and functional significance of identified CNSs.
Main Methods:
- Cross-species comparative sequence analysis to identify conserved noncoding sequences (CNSs).
- Chromatin immunoprecipitation (ChIP) assays to assess histone modifications and transcription factor binding.
- Reporter transgene assays to evaluate enhancer activity.
- Gene deletion studies in reporter constructs to assess functional necessity.
Main Results:
- Identified a distal conserved noncoding sequence, CNS-22, located 22 kb upstream of the Ifng gene.
- CNS-22 exhibits histone modifications indicative of accessible chromatin in T helper 1 (Th1) and Th2 cells.
- CNS-22 shows T-bet-dependent binding and enhancer activity specifically in Th1 cells.
- Deletion of CNS-22 abolished Ifng expression in Th1 effector cells, cytotoxic T lymphocytes, and natural killer cells.
Conclusions:
- A single distal regulatory element, CNS-22, is essential for Ifng gene expression.
- CNS-22 plays a critical role in Ifng production across both adaptive (Th1, CTL) and innate (NK) immune effector cells.
- This finding provides new insights into the coordinated regulation of immune responses by distal enhancers.
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