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Piwi (or PIWI) genes were identified as regulatory proteins responsible for stem cell and germ cell differentiation. Piwi is an abbreviation of P-element Induced WImpy testis in Drosophila. Piwi proteins are highly conserved RNA-binding proteins and are present in both plants and animals. Piwi proteins belong to the Argonaute/Piwi family and have been classified as nuclear proteins. Studies on Drosophila have also indicated that Piwi proteins have no slicer activity conferred by the presence of the Piwi domain. In addition, Piwi associates with heterochromatin protein 1, an epigenetic modifier, and piRNA-complementary sequences. These are indications of the role Piwi plays in epigenetic regulation. Piwi proteins are also thought to control the biogenesis of piRNA as many Piwi-like proteins

AttributesValues
rdf:type
rdfs:label
  • Piwi (en)
  • PIWI-Proteine (de)
  • Piwi (es)
  • Piwi (pt)
  • Piwi (ru)
  • PIWI (zh)
rdfs:comment
  • Die Gruppe der piwi-Gene codiert für eine Klasse von Proteinen, die mit piRNAs interagieren und mit deren Hilfe an der Genregulation von Eukaryoten beteiligt sind. Der Name piwi (manchmal auch PIWI) steht für P-element induced wimpy testis. (de)
  • Piwi (PIWI, от англ. P-element induced wimpy testis) — семейство генов, кодирующих регуляторные белки, участвующие в обеспечении неполной дифференцировки стволовых клеток, а также в поддержании постоянных значений темпов деления клеток зародышевой линии (то есть белки Piwi могут экспрессироваться и в обычных соматических клетках). Белки Piwi высококонсервативны и имеются как у растений, так и у животных (от губок до человека). (ru)
  • Piwi是Argonaute蛋白質家族的一個結構域,同時也是部分Argonaute家族蛋白(特指與piRNA結合者)的通稱,最早在黑腹果蠅中發現,為「誘導的小睪丸」(P-element Induced WImpy testis)之簡稱。Argonaute/Piwi家族的蛋白N端有一可與小RNA3′端的單股突出鹼基結合,中間有MID結構域與小RNA5′端的磷酸基結合,C端則為具內切酶活性的Piwi結構域。 一般而言Argonaute家族的蛋白與miRNA或siRNA(長約20nt)結合,Piwi家族的蛋白則與piRNA(長約30nt)結合,主要在睪丸的精原細胞中表現,Piwi蛋白與piRNA結合後可進入細胞核中造成目標DNA的DNA甲基化和組蛋白甲基化等表觀遺傳修飾以抑制基因表現,也可在細胞質中抑制目標mRNA的轉譯。Piwi-piRNA的主要功能可能為抑制精原細胞基因組中自私的基因元件(如反轉錄轉座子)表現,Piwi蛋白的缺陷可能導致精子發生異常,但許多哺乳類的體細胞亦有表現Piwi蛋白與piRNA。 人類基因組中已知有4個Piwi蛋白(PIWI樣蛋白1-4,又稱HIWI蛋白1-4),小鼠的Piwi蛋白則稱為MIWI蛋白。 (zh)
  • Piwi (o PIWI) es una de las dos subfamilias de proteínas que componen la familia (la otra subfamilia se denomina Argonauta) que están presentes en animales.​ Se corresponden con genes codificantes de proteínas reguladoras responsables de los procesos de diferenciación en células germinales y células madre.​ Piwi proviene de una abreviación de P-element Induced WImpy testis en Drosophila.​ Las proteínas Piwi están altamente conservadas como proteínas de unión a RNA y están presentes tanto en eucariotas como arqueas.​​ Las proteínas Piwi pertenecen a la familia Argonaute/Piwi que han sido clasificadas como proteínas nucleares. Estudios en Drosophila han demostrado que las proteínas Piwi tienen actividad "slicer" o cortadora que es conferida por uno de los dominios que conforma la proteína, (es)
  • Piwi (or PIWI) genes were identified as regulatory proteins responsible for stem cell and germ cell differentiation. Piwi is an abbreviation of P-element Induced WImpy testis in Drosophila. Piwi proteins are highly conserved RNA-binding proteins and are present in both plants and animals. Piwi proteins belong to the Argonaute/Piwi family and have been classified as nuclear proteins. Studies on Drosophila have also indicated that Piwi proteins have no slicer activity conferred by the presence of the Piwi domain. In addition, Piwi associates with heterochromatin protein 1, an epigenetic modifier, and piRNA-complementary sequences. These are indications of the role Piwi plays in epigenetic regulation. Piwi proteins are also thought to control the biogenesis of piRNA as many Piwi-like proteins (en)
  • Os genes piwi (ou PIWI) foram identificados como reguladores proteínas responsáveis por células estaminais e células germinativas diferenciação. Piwi é uma abreviatura de P-element Induced WImpy testículo em Drosophila. As proteínas Piwi são proteínas de ligação a RNA altamente conservadas e estão presentes em plantas e animais. As proteínas Piwi pertencem à família Argonaute / Piwi e foram classificadas como proteínas nucleares. Estudos sobre Drosophila também indicaram que as proteínas Piwi têm uma atividade mais fina conferida pela presença do domínio Piwi. Além disso, Piwi se associa à proteína 1 da heterocromatina, um modificador epigenético e sequências complementares de piRNA. Essas são indicações do papel que Piwi desempenha na regulação epigenética. Pensa-se também que as proteína (pt)
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  • Piwi domain (en)
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  • http://commons.wikimedia.org/wiki/Special:FilePath/1ytu_argonaute_dsrna.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/PDB_1z26_EBI.jpg
  • http://commons.wikimedia.org/wiki/Special:FilePath/Piwi-piRNA_pathway1.png
  • http://commons.wikimedia.org/wiki/Special:FilePath/Piwi.png
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