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Resolving systematic errors in widely used enhancer activity assays in human cells.

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Summary

Plasmid reporter assays for identifying human enhancers are unreliable due to bacterial origin of replication (ORI) and interferon responses. New methods overcome these issues, enabling accurate genome-wide enhancer discovery.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Epigenetics

Background:

  • Identifying transcriptional enhancers is crucial for understanding human gene regulation.
  • Plasmid-based reporter assays are standard for functional enhancer assessment but suffer from artifacts.
  • Artifacts include bacterial origin of replication (ORI) acting as a promoter and type I interferon (IFN-I) responses.

Purpose of the Study:

  • To identify reliable methods for functional enhancer characterization in human cells.
  • To overcome limitations of plasmid-based assays, specifically false positives and negatives.
  • To enable accurate genome-wide enhancer discovery using STARR-seq.

Main Methods:

  • Utilizing the bacterial origin of replication (ORI) as a core promoter in reporter constructs.
  • Inhibiting key interferon-I (IFN-I) inducing kinases to suppress cellular responses.
  • Performing genome-wide STARR-seq (Self-Amplifying RNA Regulatory Element sequencing) in human cells.

Main Results:

  • Developed a modified STARR-seq method overcoming ORI and IFN-I artifacts.
  • Successfully identified strong enhancers, IFN-I-inducible enhancers, and chromatin-silenced enhancers in HeLa-S3 cells.
  • Demonstrated the applicability of the improved method for all episomal enhancer activity assays.

Conclusions:

  • The study presents a robust methodology for accurate functional enhancer identification in human genomes.
  • Findings are critical for advancing the characterization of human transcriptional enhancers.
  • The developed approach resolves confounding factors in reporter assays, ensuring reliable enhancer discovery.