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The fidelity of synaptonemal complex assembly is regulated by a signaling mechanism that controls early meiotic progression

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Lightfoot,  James W.
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Max Planck Research Group Self-Recognition and Cannibalism, Center of Advanced European Studies and Research (caesar), Max Planck Society;

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Citation

Silva, N., Ferrandiz, N., Barroso, C., Tognetti, S., Lightfoot, J. W., Telecan, O., et al. (2014). The fidelity of synaptonemal complex assembly is regulated by a signaling mechanism that controls early meiotic progression. Developmental Cell, 31(4), 503-511. doi:10.1016/j.devcel.2014.10.001.


Cite as: https://hdl.handle.net/21.11116/0000-0007-DD9F-E
Abstract
Proper chromosome segregation during meiosis requires the assembly of the synaptonemal complex (SC) between homologous chromosomes. However, the SC structure itself is indifferent to homology, and poorly understood mechanisms that depend on conserved HORMA-domain proteins prevent ectopic SC assembly. Although HORMA-domain proteins are thought to regulate SC assembly as intrinsic components of meiotic chromosomes, here we uncover a key role for nuclear soluble HORMA-domain protein HTP-1 in the quality control of SC assembly. We show that a mutant form of HTP-1 impaired in chromosome loading provides functionality of an HTP-1-dependent checkpoint that delays exit from homology search-competent stages until all homolog pairs are linked by the SC. Bypassing of this regulatory mechanism results in premature meiotic progression and licensing of homology-independent SC assembly. These findings identify nuclear soluble HTP-1 as a regulator of early meiotic progression, suggesting parallels with the mode of action of Mad2 in the spindle assembly checkpoint.