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Transcriptomics analysis of gene expression in wide type, ybx1 MO, pabpc1a MO zebrafish embryo sample.

ABSTRACT: Transcriptomics analysis of gene expression in wide type, ybx1 MO, pabpc1a MO zebrafish embryo sample.

PROVIDER: PRJNA493827 | ENA |

REPOSITORIES: ENA

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Transcriptomics analysis of gene expression in wide type, ybx1 MO, pabpc1a MO zebrafish embryo sample.

Project description:The maternal-to-zygotic transition (MZT) is a conserved and fundamental process during which the embryo undergoes dramatic reprogramming to convert maternal environment to embryonic-driven programing. However, how the maternally supplied transcripts are dynamically regulated during MZT remains largely unknown. Herein, through genome-wide profiling of RNA 5-methylcytosine (m5C) in zebrafish early embryos, we show that m5C methylated maternal mRNAs display higher stability during MZT. We identify that the Y box-binding protein 1 (Ybx1) prefers to recognizing m5C-modified mRNAs through p-p interaction with a key residue Trp45 in its cold shock domain (CSD), which plays essential roles in maternal mRNA stability and early embryogenesis of zebrafish. Cooperated with an mRNA stabilizer Pabpc1a, Ybx1 promotes the stability of its target mRNAs in an m5C-dependent manner. Our study demonstrates a novel mechanism of RNA m5C methylation-regulated maternal mRNA stability during zebrafish MZT, highlighting the critical role of m5C mRNA methylation in early development.

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Project description:Y box-binding protein 1 (Ybx1) is critical for embryogenesis and organogenesis. In zebrafish, we identify Ybx1 is predominantly expressed in the enterocytes of intestine in day5 larvae, whereas its immediately degradation driven by ubiquitination on day6. Here we show the maternal lethality with cardiac edema in ybx1-/- larvae, and postnatal larval lethality exhibited in ybx1-/- larvae within the death window from 10dpf to 20dpf. To study the underlying mechanisms for the ybx1-/- larvae partial lethality, we performed RNA-seq and experimental results showed the increased ROS might be the underlying cause for the postnatal lethality. By ascorbic acid treatment, we found ascorbic acid exposure prevented ybx1-/- larvae from postnatal lethality, while hydrogen peroxide aggravated ybx1-/- larvae postnatal lethality during the death window. By RNA-seq analysis, we also found significantly increased expressions of mmp9 and mmp13a in ybx1-/- larvae, and by inhibition of either MMP9 or MMP13a expression partially rescue the ybx1-/- postnatal lethality during the death window. Later, we further identify the intestinal impairs on 30 dpf and further deteriorated severe intestinal disorder in Ybx1 deficiency zebrafish. By exposure of ybx1-/- zebrafish for 14 days, we discover ascorbic acid partially mend the impaired intestine in ybx1-/-. In this study, we demonstrate that ybx1-/- larvae were ROS-susceptible, and the increased inflammation in ybx1-/- larvae intestine identified enables the ybx1-/- zebrafish as good model for studying of intestinal disease.

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Zebrafish embryos: Control MO vs. Lin28A MO vs. Lin28B MO injected

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RNA-seq of control and foxo3b MO zebrafish cells.

Project description:Gata1+ cells isolated from control and foxo3b MO zebrafish at 24 and 48hpf were subjected to RNA-seq and related analyses. Gata1-GFP zebrafish stran was utilized, embryos were injected with foxo3b MO and standard MO at one-cell stage. Gata1+ cells were selected by FACS at 24 and 48hpf and submitted to RNA-seq and related analyses.

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