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関連する概念動画

Position-effect Variegation02:32

Position-effect Variegation

In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
Inheritance of Chromatin Structures03:17

Inheritance of Chromatin Structures

Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying DNA...
DNA-only Transposons02:57

DNA-only Transposons

DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
The donor site from where the transposon is excised is either degraded or...
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Heterochromatin02:38

Heterochromatin

The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
X-Inactivation01:58

X-Inactivation

The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.

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関連する実験動画

Updated: Jul 8, 2026

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
07:50

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

Published on: November 25, 2015

DNAのライトスイッチの振る舞いにインターケレーションは必要ありません.

Daniel A Lutterman1, Abdellatif Chouai, Yao Liu

  • 1Department of Chemistry, The Ohio State University, Columbus, Ohio 43210, USA.

Journal of the American Chemical Society
|January 9, 2008
PubMed
まとめ
この要約は機械生成です。

この研究では,バイメタリックルテニウム複合体がDNAの光スイッチとして作用し,DNAに間接しないことを明らかにしました. この発見は,光スイッチの行動がDNAのインターカレーションを独占的に確認するという仮定に異議を唱える.

さらに関連する動画

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

関連する実験動画

Last Updated: Jul 8, 2026

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks
07:50

Plasmid-derived DNA Strand Displacement Gates for Implementing Chemical Reaction Networks

Published on: November 25, 2015

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation
09:26

DNA-Tethered RNA Polymerase for Programmable In vitro Transcription and Molecular Computation

Published on: December 29, 2021

科学分野:

  • 協調化化学について
  • バイオ・オーガニック化学 バイオ・オーガニック化学
  • フォトケミストリー フォトケミストリー

背景:

  • DNA結合時に発光する移行金属複合体は,しばしばインターカラートであると仮定されます.
  • DNAの光スイッチ複合体[Ru(bpy) 2(tpphz) ]2+ (1) は,DNAに結合すると放射性である.

研究 の 目的:

  • 非インターカリングバイメタリック複合体のDNA結合および発光特性[bpy) 2Ru (tpphz) Ru (bpy) ]4+ (2) を調査する.
  • ライトスイッチの行動がDNAインターキャラなしで起こるかどうかを判断する.

主な方法:

  • 複合体2の光譜分析 (放出光譜) は,小牛のチムスのDNA (ct-DNA) とヘリングの精子のDNAの存在で行われます.
  • DNAのインターキャレーションを評価するための粘度測定.
  • 電子特性を理解するための密度関数理論 (DFT) 計算.

主要な成果:

  • 複合体2は,ct-DNAと結合すると赤色シフトとともに,発光強度が40倍増加する.
  • 粘度測定とスレッド実験は,複合体2がDNAに挿入されないことを確認しています.
  • DFTの計算は,観測された光特性をサポートし,電子構造と相関させます.

結論:

  • バイメタリック複合体2は,非間接メカニズムを通じてDNAのライトスイッチとして機能する.
  • この作品は,光スイッチの振る舞いを実証する非インターケレーション金属複合体の最初の例を示しています.
  • ライトスイッチの振る舞いは,DNAのインターケレーションを限定的に示すものではない.