Lamin B loss in nuclear blebs is rupture dependent while increased DNA damage is rupture independent.

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Tác giả: Jaylynn Abreu, Michael Seifu Bahiru, Alexis M Carson, Catherine G Chu, Lyssa M Cunha, Arav P Desai, Katherine Dorfman, Kate E Faucon, Sara N Folan, Nicholas Kam, Dasha Khvorova-Wolfson, Nick Lang, Hannah Lee, Gianna Manning, Emily Naughton, Leena Phan, Mai Pho, Kelsey Prince, Kiruba Shalin, Andrew D Stephens, Zachary L Wald, Erin Walsh, Mindy D Zheng

Ngôn ngữ: eng

Ký hiệu phân loại: 809.008 History and description with respect to kinds of persons

Thông tin xuất bản: United States : bioRxiv : the preprint server for biology , 2025

Mô tả vật lý:

Bộ sưu tập: NCBI

ID: 683465

The nucleus houses genetic information and functions separate from the rest of the cell. Loss of nuclear shape results in nuclear ruptures. Nuclear blebs are deformations identified by decreased DNA density, while lamin B levels vary drastically. To determine if decreased lamin B levels are due to nuclear rupture, we used immunofluorescence to measure levels of lamin B and emerin, a nuclear envelope protein that enriches to sites of nuclear rupture. We observed that cell types that exhibit decreased levels of lamin B also show an enrichment of emerin in nuclear blebs. Oppositely, in other cell types, nuclear blebs display maintained levels of lamin B1 and showed no emerin enrichment. To determine how nuclear rupture affects DNA damage, we time lapse imaged nuclear rupture dynamics then fixed the same cells to conduct immunofluorescence of γH2AX and emerin. We find that DNA damage levels are higher in blebbed nuclei independent of nuclear rupture. Thus, we confirm that lamin B1 loss in nuclear blebs is due to nuclear rupture and blebbed nuclei have increased DNA damage that is independent of rupture.
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