ZC3H4 restricts non-coding transcription in human cells

Area of Science:

• Molecular Biology
• Genetics
• Cell Biology

Background:

• Thousands of non-coding RNAs are transcribed from the human genome.
• Mechanisms restricting early termination and rapid degradation of these RNAs are poorly understood.

Purpose of the Study:

• To identify factors involved in transcriptional termination of protein-coding genes.
• To investigate the function of ZC3H4 in regulating non-coding RNA transcription.

Main Methods:

• Screening for protein-coding gene transcriptional termination factors.
• Assessing the impact of ZC3H4 depletion on RNA stability and transcription.
• Investigating ZC3H4 occupancy at specific genomic loci.
• Utilizing engineered tethering assays to study RNA degradation by the exosome.

Main Results:

• ZC3H4 was identified as a transcriptional termination factor.
• ZC3H4 depletion led to upregulation and extension of hundreds of unstable transcripts, including antisense RNAs and enhancer RNAs.
• ZC3H4 occupies loci transcribing these unstable RNAs, indicating a direct role.
• Tethering ZC3H4 to reporter RNA promoted its exosome-mediated degradation.
• ZC3H4 loss significantly reduced cell proliferation.

Conclusions:

• ZC3H4 plays a critical role in restricting non-coding RNA transcription, particularly in multicellular organisms.
• The findings highlight ZC3H4's importance in regulating enhancer RNAs and overall cell proliferation.