Optogenetic induction of TAD boundary pairing promotes gene activity

Light-driven OptoTet pairing of TAD boundaries at the ERRFI1 locus increases gene bursting, linking boundary looping dynamics to transcriptional activity in a gene-specific way.

• Why it matters: It remains unclear whether the structural integrity and short-lived pairing of TAD boundaries functionally regulates genes inside TADs, beyond their architectural role.
• What they did: Using OptoTet, the authors rapidly manipulated chromatin contacts by light in TADs containing ERRFI1 or MYC, then measured boundary looping and transcriptional bursting.
• The result: Boundary pairing promoted ERRFI1 transcriptional activity via increased gene bursting, while MYC bursting was insensitive; enhanced pairing partially rescued cohesin depletion effects for ERRFI1 but not MYC.

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