外部B細胞の編集とスイッチングにおける転位を促進するメカニズム

Jing H Wang¹, Monica Gostissa, Catherine T Yan

¹Howard Hughes Medical Institute, USA.

Nature

|July 10, 2009

まとめ

周辺のB細胞は二次V(D) J再結合を経験し,DNAの断裂や転位を引き起こす. この研究は,腫瘍における再発性転位を促進するメカニズム的要因を明らかにしています.

科学分野:

免疫学免疫学とは
分子生物学は分子生物学である.
遺伝学遺伝学とは

背景:

変数,多様性,結合 (V,D,J) リコンビネーションとクラス・スイッチ・リコンビネーション (CSR) は,免疫グロブリン遺伝子組立と機能において極めて重要です.
V(D) JとCSRは,非同類末端結合 (NHEJ) によって修復されたDNA二重鎖断裂 (DSB) に依存しています.
これらのプロセスの誤差は,染色体転位につながり,B細胞リンパ腫に関与します.

研究の目的:

周辺B細胞におけるV(D) J再結合の論争の的発生を調査する.
V(D) J再結合とCSRの潜在的協力を探求し,トランスロケーションを生成する.
腫瘍における再発性転位に寄与するメカニズム的要因を特定する.

主な方法:

活性化され,NHEJ欠乏した臓B細胞の分析.
ラムダIgL位置 (Igl) でV(D) J再結合に関連した断裂の検出.
CSRに関連したIgH破裂と転位形成の評価.
Igh-IglとIgh-c-mycの共同ロケーションの調査.
移転促進を研究するためにc-myc DSBの導入.

主要な成果:

NHEJ欠乏した臓B細胞は,V (D) J関連断裂をIglで,CSR関連断裂をIghで蓄積する.
IglとIghの断絶は頻繁に結合して転位を形成し,しばしばIgh-Iglの共局所化に関連しています.
Ighとc-mycの共同局所化は観察され,c-myc DSBはIgh-c-mycの転位を強力に促進する.
証拠によると,周辺のB細胞は,二次V(D) J再結合を試みている.

結論:

周辺のB細胞は,二次V(D) J再結合を受けることができます.
機械的要因は,腫瘍における再発性転位の形成に寄与する.
この研究は,外周B細胞におけるV(D) J再結合の役割と,腫瘍性転位との関連を明らかにしている.

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