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MAJIN Links Telomeric DNA to the Nuclear Membrane by Exchanging Telomere Cap

Journal article
Authors Hiroki Shibuya
Abrahan Hernández-Hernández
Akihiro Morimoto
Lumi Negishi
Christer Höög
Yoshinori Watanabe
Published in Cell
Volume 163
Pages 1252-1266
ISSN 00928674
Publication year 2015
Published at
Pages 1252-1266
Language en
Subject categories Cell Biology


© 2015 Elsevier Inc.Summary In meiosis, telomeres attach to the inner nuclear membrane (INM) and drive the chromosome movement required for homolog pairing and recombination. Here, we address the question of how telomeres are structurally adapted for the meiotic task. We identify a multi-subunit meiotic telomere-complex, TERB1/2-MAJIN, which takes over telomeric DNA from the shelterin complex in mouse germ cells. TERB1/2-MAJIN initially assembles on the INM sequestered by its putative transmembrane subunit MAJIN. In early meiosis, telomere attachment is achieved by the formation of a chimeric complex of TERB1/2-MAJIN and shelterin. The chimeric complex matures during prophase into DNA-bound TERB1/2-MAJIN by releasing shelterin, forming a direct link between telomeric DNA and the INM. These hierarchical processes, termed "telomere cap exchange," are regulated by CDK-dependent phosphorylation and the DNA-binding activity of MAJIN. Further, we uncover a positive feedback between telomere attachment and chromosome movement, revealing a comprehensive regulatory network underlying meiosis-specific telomere function in mammals.

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