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関連する概念動画

Transcytosis of IgG01:15

Transcytosis of IgG

Transcytosis is the process in which molecules are internalized by endocytosis, transported across the cell, and released through exocytosis from the opposite end of the cell. Molecules such as insulin, immunoglobulins, and certain nutrients are transferred through the recycling endosomes by recycling and transcytosis.
IgG molecules from a mother undergo transcytosis starting around 13 weeks of gestation. The amount of IgG transferred and entering the fetal blood circulation increases with...
TGF - β Signaling Pathway01:16

TGF - β Signaling Pathway

The TGF-β signaling pathway regulates cell growth, differentiation, adhesion, motility, and development. TGF-β ligands that induce TGF-β signaling are synthesized in their latent form. Several proteases or cell surface receptors such as integrins act upon the latent form, releasing the active ligand. There are three types of mammalian TGF-βs: (TGF-β1, TGF-β2, and TGF-β3) that bind as homodimers or heterodimers to TGF-β receptors. The TGF-β receptors are of three kinds RI, RII, and RIII. The RI...
Type IV Collagen of Basal Lamina01:05

Type IV Collagen of Basal Lamina

Type IV collagen is a 400 nm long, network-forming collagen that acts as a barrier between the epithelial and endothelial cells. Type IV collagen  forms the backbone of the basement membrane by scaffolding with laminin, entactin, proteoglycans, and fibronectin. Apart from rendering structural support to the basement membrane, it also helps entail signaling potentials necessary for both pathological and physiological functions.
A type IV collagen molecule has six alpha chains which can exist in...
Reticular Dermis01:15

Reticular Dermis

The papillary and reticular dermis are the two layers of the dermis. They are made of connective tissue with fibers of collagen extending from one to the other, making the border between the two somewhat indistinct. The dermal papillae extending into the epidermis belong to the papillary layer, whereas the dense collagen fiber bundles below belong to the reticular layer.
Reticular Layer
Underlying the papillary layer is the much thicker reticular layer, composed of dense, irregular connective...

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Updated: May 8, 2026

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ループエクストルーションは,RAGスキャンのための生理的なIGHロクスの収縮を媒介する.

Hai-Qiang Dai1,2, Hongli Hu3,4, Jiangman Lou3,4

  • 1Howard Hughes Medical Institute, Program in Cellular and Molecular Medicine, Boston Children's Hospital, Boston, MA, USA. hai-qiang.dai@childrens.harvard.edu.

Nature
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まとめ

祖先のB細胞におけるRAGスキャンを調査すると,V(D) J再結合とは独立して場所の収縮が起こることが明らかになる. このプロセスはコヘシン媒介のループ流出とCTCF結合要素によって制御され,DNAアクセシビリティに影響を与えます.

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科学分野:

  • 免疫学
  • 分子生物学
  • 遺伝学

背景:

  • RAG エンドヌクレアスは,再結合信号配列 (RSS) のためにクロマチンをスキャンすることによって,Igh V(D) J 再結合を開始する.
  • コヘシン媒介のループ挤出は,長距離RAGスキャンを容易にするが,CTCF結合要素 (CBEs) は,このプロセスを阻害する.
  • V(H) 位置は,親細胞B細胞の収縮が十分に理解されていないため,潜在的にV(H) 辺のアクセシビリティを改善します.

研究 の 目的:

  • V (H) 位置の収縮とRAGスキャンに対するその影響の仕組みを解明する.
  • プロジェニターB細胞におけるV(D) J再結合の調節におけるループ挤出とCBEsの役割を調査する.

主な方法:

  • マウスのプライマリプロジェンターB細胞におけるV (H) ロックスの逆転の分析.
  • V ((H)) -RSSと暗号化されたRSSの再編成の評価
  • V (H) 位置を超えたRAGスキャンの評価
  • ウイングス・アパート・ライク・プロテイン・ホモローグ (WAPL) の発現と枯渇の調査.

主要な成果:

  • V(H) 場所の逆転は,V(H) -RSSと通常収束する暗号的RSSの再編成を廃止した.
  • 逆方向の暗号V (H) -RSSとV (H) 場所を超えたRAGスキャンを利用する.
  • 初代 B 細胞における WAPL 発現の低さは,局所収縮と RAG スキャニングと相関しており,WAPL 減少がこれらのプロセスを活性化している.

結論:

  • CBE阻害の緩和は,先駆体B細胞のループエクストルーション経由でV (H) 場所のRAGスキャンを促進する.
  • ループの流出はV (H) 場所の収縮に関与し,WAPLはコヘシンダイナミクスを影響する.
  • これらの発見は,V (H) 場所のアクセシビリティとV (D) J再結合の規制に関するメカニズム的洞察を提供します.