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piRNA - Piwi-interacting RNAs02:57

piRNA - Piwi-interacting RNAs

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PIWI-interacting RNAs, or piRNAs, are the most abundant short non-coding RNAs. More than 20,000 genes have been found in humans that code for piRNAs while only 2000 genes have been found for miRNAs. piRNAs can act at the transcriptional and post-transcriptional levels and have a vital role in silencing transposable elements present in germ cells. They are also involved in epigenetic silencing and activation. Previously, they were thought to function only in germ cells but new evidence suggests...
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siRNA - Small Interfering RNAs02:30

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Small interfering RNAs, or siRNAs, are short regulatory RNA molecules that can silence genes post-transcriptionally, as well as the transcriptional level in some cases. siRNAs are important for protecting cells against viral infections and silencing transposable genetic elements.
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lncRNA - Long Non-coding RNAs02:39

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In humans, more than 80% of the genome gets transcribed. However, only around 2% of the genome codes for proteins. The remaining part produces non-coding RNAs which includes ribosomal RNAs, transfer RNAs, telomerase RNAs, and regulatory RNAs, among other types. A large number of regulatory non-coding RNAs have been classified into two groups depending upon their length – small non-coding RNAs, such as microRNA, which are less than 200 nucleotides in length, and long non-coding RNA...
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Most plants use the C3 pathway for carbon fixation. However, some plants, such as sugar cane, corn, and cacti that grow in hot conditions, use alternative pathways to fix carbon and conserve energy loss due to photorespiration. Photorespiration is the process that occurs when the oxygen concentration is high. Under such conditions, the rubisco enzyme in the Calvin cycle binds O2 instead of CO2, which halts photosynthesis and consumes energy.
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古代の経路は,小さなRNAによってプログラムされています.

Phillip D Zamore1

  • 1Department of Biochemistry and Molecular Pharmacology, University of Massachusetts Medical School, Lazare Research Building, Room 825, 364 Plantation Street, Worcester, MA 01605, USA. phillip.zamore@umassmed.edu

Science (New York, N.Y.)
|May 23, 2002
PubMed
まとめ
この要約は機械生成です。

RNA干渉 (RNAi) は,遺伝子発現を抑制するために二重鎖RNAを使用し,機能的な遺伝子解析を可能にします. 細胞はこのメカニズムを使って,欠陥のあるメッセンジャーRNAを排除し,ウイルスやトランポゾンから防御する可能性がある.

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科学分野:

  • 分子生物学は分子生物学である.
  • 遺伝学 遺伝学とは
  • バイオケミストリー バイオケミストリー

背景:

  • 二重鎖RNA (dsRNA) は,RNA干渉 (RNAi) と呼ばれるエウカリオットの遺伝子発現抑制のためのツールです.
  • dsRNA媒介の遺伝子サイレンシングの正確なメカニズムと細胞の目的は,現在も調査中です.
  • RNAサイレンシング現象は,細胞の防御システムの一部であると仮定されています.

研究 の 目的:

  • 二重鎖RNAが遺伝子発現を抑制する細胞メカニズムを探求する.
  • RNA干渉に関与する細胞機械の生物学的重要性を理解する.
  • 細胞防御と品質管理におけるRNAサイレンシングの役割を調査する.

主な方法:

  • RNA干渉経路に関する現在の証拠と提案されたモデルのレビュー.
  • dsRNAの認識と処理に関与する分子相互作用の分析.
  • 異なるエウカリオット系におけるRNAサイレンシングの比較分析.

主要な成果:

  • RNA干渉は,dsRNAを使用して特定のメッセンジャーRNAを標的にし,劣化させ,それによって遺伝子発現を静止させます.
  • RNAサイレンシングのための細胞機械は,古代の防衛システムであるようです.
  • 証拠は,異常RNAを排除し,移動性遺伝子要素と闘う役割を示唆しています.

結論:

  • RNA干渉は保存された生物学的プロセスであり,遺伝子機能の研究に重要な意味を持つ.
  • 細胞RNAサイレンシングメカニズムは,ゲノムの完全性を維持し,病原体から防御するために不可欠です.
  • dsRNA媒介遺伝子調節の複雑さを完全に解明するには,さらなる研究が必要である.