RRC ID 51575
Author Miura K, Matoba S, Ogonuki N, Namiki T, Ito J, Kashiwazaki N, Ogura A.
Title Application of auxin-inducible degron technology to mouse oocyte activation with PLCζ.
Journal J Reprod Dev
Abstract In mammals, spermatozoa activate oocytes by triggering a series of intracellular Ca2+ oscillations with phospholipase C zeta (PLCζ), a sperm-borne oocyte-activating factor. Because the introduction of PLCζ alone can induce oocyte activation, it might be a promising reagent for assisted reproductive technologies. To test this possibility, we injected human PLCζ (hPLCζ) mRNA into mouse oocytes at different concentrations. We observed the oocyte activation and subsequent embryonic development. Efficient oocyte activation and embryonic development to the blastocyst stage was achieved only with a limited range of mRNA concentrations (0.1 ng/μl). Higher concentrations of mRNA caused developmental arrest of most embryos, suggesting that excessive PLCζ protein might be harmful at this stage. In a second series of experiments, we aimed to regulate the PLCζ protein concentration in oocytes by applying auxin-inducible degron (AID) technology that allows rapid degradation of the target protein tagged with AID induced by auxin. Injection of the hPLCζ protein tagged with AID and enhanced green fluorescent protein (hPLCζ-AID-EGFP) demonstrated that high EGFP expression levels at the late 1-cell stage were efficiently reduced by auxin treatment, suggesting efficient hPLCζ degradation by this system. Furthermore, the defective development observed with higher concentrations of hPLCζ-AID-EGFP mRNA was rescued following auxin treatment. Full-term offspring were obtained by round spermatid injection with optimized hPLCζ-AID activation. Our results indicate that this AID technology can be applied to regulate the protein levels in mouse oocytes and that our optimized PLCζ system could be used for assisted fertilization in mammals.
Volume 64(4)
Pages 319-326
Published 2018-8-20
DOI 10.1262/jrd.2018-053
PMID 29731504
PMC PMC6105737
MeSH Animals Embryonic Development / drug effects* Female Mice Oocytes / drug effects* Oocytes / metabolism Phosphoinositide Phospholipase C / metabolism* RNA, Messenger / pharmacology* Sperm-Ovum Interactions / drug effects*
IF 1.635
Times Cited 3
DNA material pMK106 (RDB08469) pcDNA-flag-humanPLCz-AID-EGFP-pA (RDB16761) pcDNA-Ostir1-pA (RDB16762)