A ZBTB26-Integrator Axis Mediates Targeted Transcriptional Activation
Dingdang Yu1,2,3, Guoyu Chen4, Folan Lin5
1Guangdong Cardiovascular Institute, Guangdong Provincial People's Hospital, Guangdong Academy of Medical Sciences, Southern Medical University, Guangzhou, Guangdong, China.
Summary
The Integrator complex
Area of Science:
- Molecular Biology
- Gene Regulation
- Chromatin Biology
Background:
- The Integrator complex regulates transcription by terminating RNA polymerase II (RNAPII) activity.
- Mechanisms of Integrator recruitment and its role in gene-specific transcription are not well understood.
- The auxiliary module of Integrator (INTS10/13/14/15) has poorly characterized regulatory functions.
Purpose of the Study:
- To investigate the role of ZBTB26 in Integrator complex recruitment and function.
- To elucidate the mechanism by which ZBTB26 targets Integrator to specific genomic loci.
- To understand how the ZBTB26-Integrator interaction influences gene transcription.
Main Methods:
- Co-immunoprecipitation to identify ZBTB26 as an Integrator interactor.
- DNA-binding assays to determine ZBTB26's DNA motif specificity.
- ChIP-sequencing to map ZBTB26, Integrator, and active histone marks genome-wide.
- Gene expression analysis to assess the impact of ZBTB26 depletion on target genes.
Main Results:
- ZBTB26 interacts with the Integrator auxiliary module (INTS10/13).
- ZBTB26 directly binds a specific DNA motif and co-localizes with Integrator at promoters and enhancers.
- ZBTB26 is essential for Integrator recruitment to target genes involved in stimulus response, development, and differentiation.
- The ZBTB26-Integrator complex maintains active promoter and enhancer states, driving specific transcriptional programs.
Conclusions:
- ZBTB26 acts as a DNA-binding protein that recruits the Integrator complex to specific genomic sites.
- The ZBTB26-Integrator axis provides targeted gene regulation, extending Integrator's known functions beyond catalysis.
- This interaction sustains enhancer and promoter activity, directing crucial gene expression programs.
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