Single-allele nanoscale mapping of regulatory variants.

Single-allele chromatin mapping reveals a neo-CTCF motif that increases autoimmunity risk in CD4+ T cells, affecting 405 regulatory elements linked to immune disease.

• Why it matters: Understanding how noncoding variants influence gene regulation is crucial for deciphering disease mechanisms, especially since many variants are noncausal and lie within complex chromatin regions.
• What they did: The team developed MCCv, a platform analyzing single-allele chromatin structure, to identify variant effects on chromatin interactions and gene expression, focusing on 405 immune-related regulatory elements.
• The result: They discovered a gain-of-function mechanism creating a neo-CTCF motif that disrupts super-enhancer contacts with SESN3, implicating SESN3 in autoimmunity regulation and potential therapeutic targets.