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Gene Conversion02:08

Gene Conversion

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...
The Delta-to-Delta Circuit01:17

The Delta-to-Delta Circuit

In a delta-delta configuration, the source and the load are connected in a delta manner, forming a closed loop that divides the network into three distinct phases. This configuration makes the phase voltages identical to line voltages. Assuming the sources are in positive sequence, the phase voltages can be expressed directly without having a neutral wire.
Series R—L Circuit Transients01:22

Series R—L Circuit Transients

In a series resistor-inductor (R-L) circuit, closing the switch at the start of the time period simulates a three-phase short circuit, a fault condition where all three phases of an unloaded synchronous machine are short-circuited. When there is no fault impedance and no initial current, the initial voltage is determined by the phase angle of the source voltage.
Using Kirchhoff's Voltage Law (KVL) to analyze this circuit helps determine the total asymmetrical fault current, which consists of...
Differential Relays01:20

Differential Relays

Differential relays are used to protect generators, buses, and transformers by comparing electrical quantities at different points. When a fault occurs, the difference in current between the two points triggers the relay to operate, opening the circuit breaker. Under normal conditions, the current entering (i1) and leaving (i2) a generator are equal. When a fault occurs, however, these currents become unequal, and the difference current flows in the relay operating coil, causing the relay to...
Pilot and Numeric Relaying01:21

Pilot and Numeric Relaying

Pilot relaying is a type of differential protection used in power systems. It compares electrical quantities at the terminals of equipment via a communication channel instead of direct relay interconnection. This method is essential for transmission lines where the terminals are far apart, typically up to 80 km for lines with 69 to 115 kV ratings. Four types of communication channels are used for pilot relaying:
Lossy Lines and Overvoltages01:22

Lossy Lines and Overvoltages

Transmission-line series resistance and shunt conductance cause three primary effects: attenuation, distortion, and power losses.
Attenuation
When constant series resistance and shunt conductance are present, voltage and current equations are modified. The propagation constant indicates that voltage and current waves consist of both forward and backward traveling components. These waves attenuate as they propagate, with the attenuation factor related to the resistance and conductance. In a...

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ラグの変異は,強固な代替末端結合を明らかにする.

Barbara Corneo1, Rebecca L Wendland, Ludovic Deriano

  • 1The Kimmel Center for Biology and Medicine of the Skirball Institute and Department of Pathology, New York University School of Medicine, New York, New York 10016, USA.

Nature
|September 28, 2007
PubMed
まとめ
この要約は機械生成です。

哺乳類の細胞は,非同類末端結合 (NHEJ) を含むDNA二重鎖断裂 (DSB) 修復経路を使用しています. この研究は,Ragタンパク質が改変されたときに強力な代替 NHEJ 活動を明らかにし,共同修復モデルを示唆しています.

さらに関連する動画

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
09:26

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

Published on: June 26, 2015

Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
07:46

Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block

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Last Updated: Jun 19, 2026

High Throughput Microfluidic Rapid and Low Cost Prototyping Packaging Methods
07:51

High Throughput Microfluidic Rapid and Low Cost Prototyping Packaging Methods

Published on: December 23, 2013

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices
09:26

In Situ Time-dependent Dielectric Breakdown in the Transmission Electron Microscope: A Possibility to Understand the Failure Mechanism in Microelectronic Devices

Published on: June 26, 2015

Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block
07:46

Temperature Response of Soil Organic Matter Decomposition Rates: Construction and Applications of a Temperature Gradient Block

Published on: January 30, 2026

科学分野:

  • 分子生物学は分子生物学である.
  • 免疫学 免疫学とは
  • 遺伝学 遺伝学とは

背景:

  • 哺乳類の細胞は,同種の再結合または非同種の末端結合 (NHEJ) を通じてDNAの二重鎖断裂 (DSB) を修復する.
  • 免疫多様性にとって不可欠なV(D) J再結合は,Rag1-Rag2タンパク質によって誘発されたDSBを修復するためにNHEJを使用します.
  • 免疫不全は,NHEJの重要な因子が欠けている動物で発生し",代替のNHEJ経路"の証拠があります.

研究 の 目的:

  • DNA修復における代替的なNHEJの役割と活動を調査する.
  • V(D) J再結合におけるRagタンパク質とNHEJ因子の相互作用を探求する.
  • 代替的なNHEJは軽微で非効率的な経路であるという概念に異議を唱えるために.

主な方法:

  • ネズミのラグタンパク質の遺伝子操作.
  • NHEJ欠乏細胞および野生型の細胞におけるV(D) J接点の分析.
  • 代替的なNHEJ活動と染色体転位の評価.

主要な成果:

  • 改造されたラグタンパク質は,NHEJ欠乏細胞における強力な代替NHEJ活性を示した.
  • 代替結合活動は,野生型の細胞でも観察されました.
  • この発見は,代替的なNHEJが,これまで考えられていたよりも有意であることを示唆しています.

結論:

  • Ragタンパク質とNHEJ因子がV(D) J再結合中にゲノム整合性を維持するために協力する2層モデルが提案されています.
  • 代替的なNHEJは,以前認識されていたよりも,DNA修復においてより重要な役割を果たしています.
  • この協力により,免疫系におけるDSBの効率的かつ正確な修復が保証されます.