Article ; Online: Mad1's ability to interact with Mad2 is essential to regulate and monitor meiotic synapsis in C. elegans.
2021 Volume 17, Issue 11, Page(s) e1009598
Abstract: Meiotic homolog synapsis is essential to ensure accurate segregation of chromosomes during meiosis. In C. elegans, proper regulation of synapsis and a checkpoint that monitors synapsis relies on the spindle checkpoint components, Mad1 and Mad2, and ... ...
Abstract | Meiotic homolog synapsis is essential to ensure accurate segregation of chromosomes during meiosis. In C. elegans, proper regulation of synapsis and a checkpoint that monitors synapsis relies on the spindle checkpoint components, Mad1 and Mad2, and Pairing Centers (PCs), cis-acting loci that interact with the nuclear envelope to mobilize chromosomes within the nucleus. Here, we test what specific functions of Mad1 and Mad2 are required to regulate and monitor synapsis. We find that a mutation that prevents Mad1's localization to the nuclear periphery abolishes the synapsis checkpoint but has no effect on Mad2's localization to the nuclear periphery or synapsis. By contrast, a mutation that prevents Mad1's interaction with Mad2 abolishes the synapsis checkpoint, delays synapsis and fails to localize Mad2 to the nuclear periphery. These data indicate that Mad1's primary role in regulating synapsis is through control of Mad2 and that Mad2 can bind other factors at the nuclear periphery. We also tested whether Mad2's ability to adopt a specific conformation associated with its activity during spindle checkpoint function is required for its role in meiosis. A mutation that prevents Mad2 from adopting its active conformer fails to localize to the nuclear periphery, abolishes the synapsis checkpoint and exhibits substantial defects in meiotic synapsis. Thus, Mad2, and its regulation by Mad1, is an important regulator of meiotic synapsis in C. elegans. |
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MeSH term(s) | Animals ; Caenorhabditis elegans/genetics ; Caenorhabditis elegans Proteins/metabolism ; Cell Cycle Proteins/metabolism ; Cell Nucleus/metabolism ; Chromosome Pairing ; Meiosis ; Mutation ; Protein Binding ; Spindle Apparatus/metabolism |
Chemical Substances | Caenorhabditis elegans Proteins ; Cell Cycle Proteins ; MDF-1 protein, C elegans ; MDF-2 protein, C elegans |
Language | English |
Publishing date | 2021-11-11 |
Publishing country | United States |
Document type | Journal Article ; Research Support, N.I.H., Extramural |
ZDB-ID | 2186725-2 |
ISSN | 1553-7404 ; 1553-7390 |
ISSN (online) | 1553-7404 |
ISSN | 1553-7390 |
DOI | 10.1371/journal.pgen.1009598 |
Database | MEDical Literature Analysis and Retrieval System OnLINE |
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