The abstract is read at the publisher; the summary is JClub's.
Removing all cortical ER–plasma membrane tethers in yeast (Δ-s-tether) triggers nuclear envelope membrane blisters and ruptures, linked to impaired genomic repair and spontaneous mutation.
- Why it matters: Nuclear ER continuity at the cell cortex may buffer nuclear envelope shearing and coordinate nuclear ER behavior, but the collective role of cER–PM contact sites in maintaining nuclear integrity was unclear.
- What they did: In Δ-s-tether cells lacking seven cER–PM tethers, the authors assessed nuclear envelope integrity, ESCRT-III–dependent repair, genomic repair outcomes, and mitotic nuclear segregation alongside actin and nucleopodia defects.
- The result: ESCRT-III–mediated membrane repair preserves viability despite extensive envelope lesions, while loss of cER–PM MCSs disrupts nucleopodia-driven mitotic segregation and induces a SPOC delay; restoring phospholipid metabolism or re-establishing nonspecific cER–PM contact rescues nuclear defects.
The findingWhy it mattersWhat they didThe result
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