染色体9の自動化速流合成 オープン・リーディング・フレーム 72 ディペプチド・リピート・プロテイン
Kohei Sato1,2, Charlotte E Farquhar2, Jacob Rodriguez2
1School of Life Science and Technology, Tokyo Institute of Technology, 4259 Nagatsuta-cho, Midori-ku, Yokohama-shi, Kanagawa 226-8501, Japan.
Journal of the American Chemical Society
|June 9, 2023
まとめ
C9orf72におけるヘクサヌクレオチドリピート膨張は,有毒なダイペプチドリピートタンパク質 (DPR) を生成することによって,ALSとFTDを引き起こす. この研究では,DPRを合成し,構造的性質と細胞毒性を明らかにし,疾患モデル開発を支援しました.
科学分野:
- 神経科学
- 遺伝学
- 生物化学
背景:
- C9orf72の再発はALSとFTDの主要な遺伝的原因です.
- この変異は,神経変性に関与する毒性ダイペプチドリピートタンパク質 (DPR) を生成する.
- DPRの限られた利用は,その特性や病原性メカニズムに関する研究を妨げています.
研究 の 目的:
- c9orf72ダイペプチドリピートタンパク質 (DPR) を化学的に合成する.
- 合成DPRの物理化学的性質を記述する.
- 神経細胞における合成 DPR の細胞毒性を評価する.
主な方法:
- DPR合成のための自動化高速ペプチド合成 (AFPS) (200アミノ酸まで)
- 二次構造を決定するための円形二重化スペクトロスコーピー
- 集積分析のためのサイズ排除染色体
- ヒト神経芽細胞を用いた細胞活力アッセイ
主要な成果:
- プロリンを含むDPR (ポリ-PR,ポリ-GP,ポリ-PA) は,ポリプロリンIIのような螺旋構造を採用した.
- より長いポリ-GPとポリ-PAは,結合の可能性を示した.
- 細胞活性を低下させ,内生的なDPRの細胞毒性を模倣した.
- ポリGPとポリPAは有意な細胞毒性を示さなかった.
結論:
- AFPSは,DPRのような低複雑性ペプチドを合成するのに有効です.
- 合成DPRは内生性DPRに似た構造的および細胞毒性特性を有する.
- この研究は,DPRの病原性メカニズムの研究と,ALSとFTDの疾患モデルの開発を促進します.
関連する概念動画
Karyotyping
Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Chromosome Replication
Before a cell can divide, it must accurately replicate all of its chromosomes, including the DNA and its associated histone and non-histone proteins. This process begins at numerous origins of replication during the S phase of the cell cycle in each of a cell’s chromosomes simultaneously. Certain nucleotides can act as origins of replication, but these sequences are not well defined - especially in complex, multi-cellular, eukaryotic species. The length of DNA that spans an origin of...
Karyotyping
Describing the number and physical features of chromosomes can reveal abnormalities that underlie genetic diseases. This description is facilitated by special staining techniques that produce a particular banding pattern on each chromosome. State-of-the-art techniques make this approach even more powerful, enabling the detection of individual genes that cause disease.A Simple Chromosome Staining Technique Provides Valuable Scientific InsightSome genetic diseases can be detected by looking at...
Centrosome Duplication
The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
Chromosome Duplication
The process of chromosome duplication during cell division requires genome-wide disruption and re-assembly of chromatin. The chromatin structure must be accurately inherited, reassembled, and maintained in the daughter cells to ensure lineage propagation.
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
The basic unit of the chromatin is the nucleosome, consisting of DNA wrapped around octameric histone proteins and short stretches of linker DNA separating individual nucleosomes. The histone proteins within the nucleosome have their...
Centrosome Duplication
The primary microtubule organizing center (MTOC) in animal cells is the centrosome. A centrosome has two cylindrical centrioles at its core. Each centriole consists of nine sets of three microtubules held together by proteins. The centrioles are positioned at right angles to each other and surrounded by a shapeless protein cloud called the pericentriolar matrix, or pericentriolar material (PCM).
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...
To ensure that each daughter cell receives a centrosome after cell division, centrosome duplication...


