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PLK-1 promotes the merger of the parental genome into a single nucleus by triggering lamina disassembly

Abstract : Life of sexually reproducing organisms starts with the fusion of the haploid egg and sperm gametes to form the genome of a new diploid organism. Using the newly fertilized Caenorhabditis elegans zygote, we show that the mitotic Polo-like kinase PLK-1 phosphorylates the lamin LMN-1 to promote timely lamina disassembly and subsequent merging of the parental genomes into a single nucleus after mitosis. Expression of non-phosphorylatable versions of LMN-1, which affect lamina depolymerization during mitosis, is sufficient to prevent the mixing of the parental chromosomes into a single nucleus in daughter cells. Finally, we recapitulate lamina depolymerization by PLK-1 in vitro demonstrating that LMN-1 is a direct PLK-1 target. Our findings indicate that the timely removal of lamin is essential for the merging of parental chromosomes at the beginning of life in C. elegans and possibly also in humans, where a defect in this process might be fatal for embryo development.
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https://hal.archives-ouvertes.fr/hal-03011265
Contributor : Nicolas Joly <>
Submitted on : Wednesday, November 18, 2020 - 9:17:49 AM
Last modification on : Tuesday, November 24, 2020 - 3:28:59 AM

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Griselda Velez-Aguilera, Sylvia Nkombo Nkoula, Batool Ossareh-Nazari, Jana Link, Dimitra Paouneskou, et al.. PLK-1 promotes the merger of the parental genome into a single nucleus by triggering lamina disassembly. eLife, eLife Sciences Publication, 2020, 9, ⟨10.7554/elife.59510⟩. ⟨hal-03011265⟩

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