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NOP2 nucleolar protein OKDB#: 5681
 Symbols: NOP2 Species: human
 Synonyms: NOL1, p120, NSUN1, NOP120  Locus: 12p13.31 in Homo sapiens


For retrieval of Nucleotide and Amino Acid sequences please go to: OMIM Entrez Gene
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General Comment
General function
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Cellular localization
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Ovarian function Early embryo development
Comment The nucleolar protein NOP2 is required for nucleolar maturation and ribosome biogenesis during preimplantation development in mammals. Wang H et al. (2020) The maternal nucleolus plays an indispensable role in zygotic genome activation (ZGA) and early embryonic development in mice. During oocyte-to-embryo transition, the nucleolus is subject to substantial transformation. Despite the primary role of the nucleolus is ribosome biogenesis, accumulating evidence has uncovered its functions in various other cell processes. However, the regulation of nucleolar maturation and ribosome biogenesis and the molecules involved remain unclear during early embryonic development. In this study, we observed that nucleolar protein 2 (NOP2) is restrictedly localized within the nucleolus, first detected in the late two-cell embryos, and increases to a peak level at the eight-cell stage in mice. RNAi-mediated NOP2 depletion leads to a developmental arrest during the morula-to-blastocyst transition. RNA-seq analyses reveal that 208 genes are differentially expressed, including multiple lineage-specific genes and several genes encoding ribosome proteins. Indeed, we observe a failure of the first lineage specification with reduced TEA domain transcription factor 4(TEAD4) (trophectoderm-specific), tir na nog (NANOG), and kruppel-like factor 4 (KLF4) (inner cell mass-specific). Importantly, by Transmission Electron Microscopy (TEM), we noted a decrease in the ratio of the nucleolus size and an increase in the ratio of the size of the nucleolus precursor body, suggesting the nucleolar maturation is disrupted. Moreover, both qPCR and Fluorescence In Situ Hybridization (FISH) data showcase a significant decrease in the abundance of ribosome RNAs. Similarly, NOP2 depletion causes reduced developmental potential and decreased rRNA level in bovine early embryos, suggesting a functional conservation of NOP2 in mammals. Taken together, these results suggest that NOP2 is required for mammalian preimplantation development, presumably by regulating nucleolar maturation and ribosome biogenesis.//////////////////
Expression regulated by
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Ovarian localization Oocyte
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Follicle stages
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Phenotypes
Mutations 0 mutations
Genomic Region show genomic region
Phenotypes and GWAS show phenotypes and GWAS
Links
OMIM (Online Mendelian Inheritance in Man: an excellent source of general gene description and genetic information.)
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created: Jan. 8, 2020, 1:20 p.m. by: system   email:
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last update: Jan. 8, 2020, 1:20 p.m. by: hsueh    email:



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