Development. 2025 Jan 10:dev.202865. doi: 10.1242/dev.202865. Online ahead of print.
ABSTRACT
Emerging evidence suggests that the nuclear pore complex can have unique compositions and distinct nucleoporin functions in different cells. Here, we show that Nup107, a key component of the NPC scaffold, varies in expression over development: it is expressed at higher levels in the blastula compared to the gastrula suggesting a critical role prior to gastrulation. We find depletion of Nup107 affects the differentiation of the early germ layers leading to an expansion of the ectoderm at the expense of endoderm and mesoderm. By analyzing an RNAseq time course, we observed that depletion of Nup107 affects the maternal-zygotic transition by delaying the degradation of maternal transcripts that occurs as zygotic transcription begins. The transcripts are enriched in miR427 recognition sites, a conserved microRNA that destabilizes maternal transcripts including REST, which encodes a Kruppel-type zinc finger transcription factor that we demonstrate is critical for ectodermal cell fates. Mechanistically, we show that Nup107 is required to prevent the premature export of pri-miR427 transcript before processing. Nup107 depletion leads to the reduced production of mature miR427 and maternal transcript stabilization. We conclude that high levels of Nup107 in the early embryo are critical for the nuclear retention and subsequent processing of pri-miR427 transcripts that is required for timely maternal RNA clearance to enable gastrulation.
PMID:39791357 | DOI:10.1242/dev.202865
