Local chromatin, 3D genome folding and transposon cargo shape Sleeping Beauty transposition

In mouse embryonic stem cells, Sleeping Beauty transposition from launch sites is shaped by chromatin accessibility, cargo size, and 3D contacts, with local reintegration matching launch-site contact frequencies.

• Why it matters: Understanding what controls SB reintegration beyond the donor “launch site” is needed to predict and improve genome engineering outcomes, especially for local versus interchromosomal insertion patterns.
• What they did: The authors performed local transposition experiments in mouse embryonic stem cells, varying launch-site chromatin state and transposon cargo, then compared post-excision reintegration patterns with 3D contact frequencies.
• The result: Active, accessible launch chromatin and larger or more transcriptionally active cargo reduced transposition efficiency; reintegration patterns after excision closely resembled 3D contacts, while destination chromatin composition showed no effect.

AI summary of the abstract · may contain errors · not medical advice · read the paper.