Extensive binding of poorly characterized human transcription factors to genomic dark matter.

Nearly half of 166 poorly characterized human transcription factors bind extensively to genomic dark matter, revealing new insights into genome regulation.

• Why it matters: Understanding dark matter DNA is crucial because its functions remain largely unknown, and transcription factors play key roles in gene regulation, impacting health and disease.
• What they did: The study mapped binding sites of 166 transcription factors in living cells, finding that about half associate with known regulatory regions and the other half predominantly bind to dark matter sequences, often within closed chromatin.
• The result: This work uncovers that many dark matter-binding transcription factors, including KZNFs, may repress or pioneer chromatin states, enabling new understanding of genome regulation and potential functional roles of dark matter DNA.