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Maternal miR-202-5p is required for zebrafish primordial germ cell migration by protecting small GTPase Cdc42.

J Mol Cell Biol. 2020 Jul 01;12(7):530-542
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摘要


In many lower animals, germ cell formation, migration, and maintenance depend on maternally provided determinants in germ plasm. In zebrafish, these processes have been extensively studied in terms of RNA-binding proteins and other coding genes. The role of small non-coding RNAs in the regulation of primordial germ cell (PGC) development remains largely unknown and poorly investigated, even though growing interests for the importance of miRNAs involved in a wide variety of biological processes. Here, we reported the role and mechanism of the germ plasm-specific miRNA miR-202-5p in PGC migration: (i) both maternal loss and knockdown of miR-202-5p impaired PGC migration indicated by the mislocalization and reduced number of PGCs; (ii) cdc42se1 was a direct target gene of miR-202-5p, and overexpression of Cdc42se1 in PGCs caused PGC migration defects similar to those observed in loss of miR-202-5p mutants; (iii) Cdc42se1 not only interacted with Cdc42 but also inhibited cdc42 transcription, and overexpression of Cdc42 could rescue PGC migration defects in Cdc42se1 overexpressed embryos. Thus, miR-202-5p regulates PGC migration by directly targeting and repressing Cdc42se1 to protect the expression of Cdc42, which interacts with actin to direct PGC migration. © The Author(s) (2019). Published by Oxford University Press on behalf of Journal of Molecular IBCB, SIBS, CAS.

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