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Repressing Gene Transcription by Redirecting Cellular Machinery with Chemical Epigenetic Modifiers
Published on: September 20, 2018
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Ago1 controls myogenic differentiation by regulating eRNA-mediated CBP-guided epigenome reprogramming.
Bodor Fallatah1, Muhammad Shuaib1, Sabir Adroub1
1King Abdullah University of Science and Technology, KAUST Environmental Epigenetics Research Program, Biological and Environmental Sciences and Engineering Division, Thuwal 23955, Saudi Arabia.
Cell Reports
|December 1, 2021
Summary
Nuclear Argonaute 1 (Ago1) is crucial for skeletal muscle development. It regulates gene activation by controlling chromatin modification and enhancer activity, essential for activating the myogenic program.
Area of Science:
- Molecular Biology
- Epigenetics
- Developmental Biology
Background:
- The function of nuclear RNA interference (RNAi) in mammalian development is not fully understood.
- Investigating chromatin-associated RNAi components is key to understanding gene regulation.
Purpose of the Study:
- To elucidate the role of nuclear Argonaute 1 (Ago1) in gene expression during skeletal muscle differentiation.
- To determine Ago1's mechanism in regulating chromatin modification and developmental programs.
Main Methods:
- Investigated Ago1 function in skeletal muscle differentiation.
- Analyzed chromatin modifications, specifically H3K27 acetylation (H3K27ac).
- Examined enhancer RNA (eRNA)-protein interactions, focusing on CREB-binding protein (CBP).
Main Results:
- Ago1 is essential for activating the myogenic program and skeletal muscle differentiation.
- Ago1 directly regulates H3K27ac by controlling eRNA-CBP acetyltransferase interaction.
- Depletion of Ago1 blocks myogenic gene activation, including MyoD, by preventing CBP activation.
Conclusions:
- Mammalian nuclear Ago1 functions as an enhancer-associated RNAi component involved in epigenome regulation.
- Ago1 plays a critical role in activating developmental programs, specifically skeletal muscle differentiation.
- This study establishes Ago1's function in controlling key epigenetic modifications for developmental gene activation.
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