Abstract
N-acetyltransferase 10 (NAT10)-mediated N4-acetylcytidine (ac4C) modification is crucial for mRNA stability and translation efficiency, yet the underlying function in mammalian preimplantation embryos remains unclear. Here, we characterized the ac4C modification landscape in mouse early embryos and found that the majority of embryos deficient in ac4C writer-NAT10 failed to develop into normal blastocysts. Through single-cell sequencing, RNA-seq, acetylated RNA immunoprecipitation combined with PCR (acRIP-PCR), and embryonic phenotype monitoring, Nop2 was screened as a target gene of Nat10. Mechanistically, Nat10 knockdown decreases the ac4C modification on Nop2 mRNA and reduces RNA and protein abundance by affecting the mRNA stability of Nop2. Then, depletion of NOP2 may inhibit the translation of transcription factor TEAD4, resulting in defective expression of the downstream lineage-specific gene Cdx2, and ultimately preventing blastomeres from undergoing the trophectoderm (TE) fate. However, exogenous Nop2 mRNA partially reverses this abnormal development. In conclusion, our findings demonstrate that defective ac4C modification of Nop2 mRNA hinders the morula-to-blastocyst transition by influencing the first cell fate decision in mice.
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Data Availability
All data supporting this study are available within the article and the Supplementary Materials. The RNA-seq data of Nat10-depleted morulae in mice have been deposited in the Gene Expression Omnibus database (GEO) under the accession number GSE236943.
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This work was supported by grants from the National Natural Science Foundation of China (31771601, U20A20376, 61972116) and the Applied Technology Research and Development Project of Heilongjiang (GA20C018).
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Conceptualization, MYW and QW; Methodology, HJH and ZBH; Validation, ZBH; Formal Analysis, RC and YZ; Investigation, MYW, HJH and QW; Writing—Original Draft, MYW, RC and HJH; Writing—Review & Editing, MYW, HJH, YZ and QW; Visualization, MYW and RC; Funding Acquisition, YZ and QW. All authors discussed the results and approved the final manuscript.
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All operations on experimental animals were carried out in accordance with the Guide for the Care and Use of Laboratory Animals from the Harbin Institute of Technology (HIT) and approved by the Institutional Animal Care and Use Committee or Animal Experimental Ethics Committee of HIT (IACUC-2023001).
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Wang, M., Cheng, R., He, H. et al. N4-acetylcytidine of Nop2 mRNA is required for the transition of morula-to-blastocyst. Cell. Mol. Life Sci. 80, 307 (2023). https://doi.org/10.1007/s00018-023-04955-w
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DOI: https://doi.org/10.1007/s00018-023-04955-w