Non-random spatial organization of telomeres varies during the cell cycle and requires LAP2 and BAF.

作者信息

Keller Debora, Stinus Sonia, Umlauf David, Gourbeyre Edith, Biot Eric, Olivier Nicolas, Mahou Pierre, Beaurepaire Emmanuel, Andrey Philippe, Crabbe Laure

机构信息

Molecular, Cellular and Developmental Biology Department (MCD), Centre de Biologie Intégrative (CBI), University of Toulouse, CNRS, UPS, 31062 Toulouse, France.

Laboratory for Optics and Biosciences, École polytechnique, CNRS, INSERM, IP Paris, 91128 Palaiseau, France.

出版信息

iScience. 2024 Feb 28;27(4):109343. doi: 10.1016/j.isci.2024.109343. eCollection 2024 Apr 19.

Abstract

Spatial genome organization within the nucleus influences major biological processes and is impacted by the configuration of linear chromosomes. Here, we applied 3D spatial statistics and modeling on high-resolution telomere and centromere 3D-structured illumination microscopy images in cancer cells. We found a multi-scale organization of telomeres that dynamically evolved from a mixed clustered-and-regular distribution in early G1 to a purely regular distribution as cells progressed through the cell cycle. In parallel, our analysis revealed two pools of peripheral and internal telomeres, the proportions of which were inverted during the cell cycle. We then conducted a targeted screen using MadID to identify the molecular pathways driving or maintaining telomere anchoring to the nuclear envelope observed in early G1. Lamina-associated polypeptide (LAP) proteins were found transiently localized to telomeres in anaphase, a stage where LAP2α initiates the reformation of the nuclear envelope, and impacted telomere redistribution in the next interphase together with their partner barrier-to-autointegration factor (BAF).

摘要

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