ポリコンブとトリソラックス群のタンパク質は,クロマチンの断熱器の機能を媒介する
1Department of Biology, The Johns Hopkins University, Baltimore, Maryland 21218, USA.
Cell
|March 10, 1998
まとめ
ジプシーのようなクロマチン隔離剤は,Su (Hw) とMod (mdg4) タンパク質によって調節され,ポリコンブ (PcG) とトリソラックス群 (TrxG) タンパク質と相互作用する. これらの相互作用は,より高次元の染色体領域を組織することによって,強化剤-促進剤のコミュニケーションに影響を与えます.
科学分野:
- * 分子生物学 * 分子生物学
- * 遺伝学について
- * エピジェネティクス
背景:
- *ジプシー・アイソレーターなどのクロマチン・アイソレーターは,増強剤とプロモーターの相互作用を調節することによって,遺伝子発現を調節する上で重要な役割を果たします.
- *ジプシー断熱器複合体は,無毛の抑制剤 (Su(Hw)) と下流遺伝子4の調節剤 (Mod(mdg4) のタンパク質を含む.
- * Su (Hw) と Mod (mdg4) の2つのタンパク質は,核マトリックス内で点状の局所化を示し,ポリテン染色体上の多数の場所にコロカライズします.
研究 の 目的:
- * 断熱器機能とトリソラクス群 (TrxG) とポリコンブ群 (PcG) のタンパク質の活性との関係を調査する.
- * mod (mdg4),TrxG,PcGの遺伝子の変異が,絶縁体の機能とクロマチンの組織にどのように影響するかを理解する.
- * PcGとTrxGのタンパク質が,核の局所化と機能的絶縁剤の組み立てにおける役割を明らかにする.
主な方法:
- * mod ((mdg4) 遺伝子の変異とその現象的特徴の分析.
- * TrxGおよびPcG遺伝子の突然変異が,断絶体活性および強化剤と促進剤の相互作用に及ぼす影響の検討.
- * 遺伝子変化に反応して,断熱器部品の核局所化パターンの変化の観察.
主要な成果:
- * mod ((mdg4) の変異は,TrxG遺伝子の特徴を示しています.
- *TrxG遺伝子の変異は,隣接する強化剤に対する絶縁剤効果を高め,PcG遺伝子の変異は反対効果を示します.
- * 遺伝子変異の変異は,断熱器の構成要素の核部位の観測可能な変化と相関する.
結論:
- * PcGとTrxGタンパク質が断熱器機能を調節するモデルが提案されています.
- * この調節は,より高次元の染色体領域の確立によって達成される.
- * これらの上位階ドメインは,核マトリックスでの機能的絶縁剤の組み立てに不可欠です.
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Euchromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions take up more dye, appearing darker, while the less-compact areas take up less dye and appear lighter. Based on the compaction level, chromatins are classified into two primary forms – euchromatin and heterochromatin.
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
Euchromatin is the less dense region of the chromatin and stains lighter. Euchromatin contains histone H3 extensively...
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...
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