プロテオリピドタンパク質遺伝子の変異によって,低ミエリン化と膠質細胞死亡の分離
A Schneider1, P Montague, I Griffiths
1Zentrum für Molekulare Biologie (ZMBH), Universität Heidelberg, Germany.
Nature
|August 27, 1992
まとめ
プロテオリピドタンパク質 (PLP) 変異は,オリゴデンドロサイトの死と低ミエリン化を引き起こす. ラップシャッカー変異体は,PLPは,ミエリン組立とは別に,膠質細胞の発達に明確な役割を果たしていることを示しています.
科学分野:
- 神経科学は神経科学である.
- 遺伝学 遺伝学とは
- 細胞生物学 細胞生物学
背景:
- プロテオリピドタンパク質 (PLP) は,未知の細胞機能を持つ主要なミエリン膜タンパク質です.
- PLP遺伝子の変異は,オリゴデンドロサイト死亡と低ミエリン化によって特徴づけられるペリザエウス-メルズバッハ病を引き起こす.
- Impyマウスモデルでは同様の現象型が示され,オリゴデンドロサイト生存におけるPLPの重要性を強調しています.
研究 の 目的:
- 新しいマウス変異体を使ってプロテオリピドタンパク質 (PLP) の機能を調査する.
- オリゴデンドロサイト退化が,PLP変異によって引き起こされる低ミエリン化と内在的に関連しているかどうかを判断する.
- 膠質細胞の発達とミエリン組成におけるPLPの独特な役割を解明する.
主な方法:
- PLPの残留186のIle-to-Thr置換によって定義されたラップシェーカーマウス変異体の特徴.
- オリゴデンドロサイト数,形質,およびラップシェーカーマウスの生存率の分析.
- バックシャッカーマウスにおけるミエリン化状態の評価.
主要な成果:
- Rumpshaker変異はミエリン欠乏を引き起こすが,オリゴデンドロサイト変性や早死にはつながらない.
- ラムフシャッカーマウスは正常な長寿と,形態学的に正常なオリゴデンドロサイトの完全なセットを示しています.
- これらの発見は,低ミエリン化がPLP依存性オリゴデンドロサイト変性から分離できることを示しています.
結論:
- プロテオリピドタンパク質 (PLP) は,ミエリン組立における機能とは独立して,オリゴデンドロ細胞の発達において重要な役割を果たします.
- PLPの独特な機能は,ペリザエウス-メルズバッハ病で観察された変異性の臨床表現を説明する可能性がある.
- ラップシェーカー変異種は,中枢神経系におけるPLPの二重の役割を解剖するための貴重なモデルを提供します.
関連する概念動画
01:39Mutations
Overview
02:11Proteins: From Genes to Degradation
Within a biological system, the DNA encodes the RNA, and the nucleotide sequence in the RNA further defines the amino acid sequence in the protein. This is referred to as “The Central Dogma of Molecular Biology” - a term coined by Francis Crick. Central dogma is a firm principle in biology that defines the flow of genetic information within any life form. The two fundamental steps in central dogma are - transcription and translation.
Transcription is the synthesis of RNA molecules by RNA...
Transcription is the synthesis of RNA molecules by RNA...
01:58Cell Specific Gene Expression
Multicellular organisms contain a variety of structurally and functionally distinct cell types, but the DNA in all the cells originated from the same parent cells. The differences in the cells can be attributed to the differential gene expression. Liver cells, whose functions include detoxification of blood, production of bile to metabolize fats, and synthesis of proteins essential for metabolism, must express a specific set of genes to perform their functions. Gene expression also varies with...
01:30Overview of Cell Death
Cell death is an essential process where the body gets rid of old or damaged cells. Cell proliferation and death need to be balanced, as an imbalance between the two may lead to cancer or autoimmune diseases.
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...
Cell death was observed in the early 19th century, but there was no experimental evidence to prove it. In 1842, Carl Vogt first discovered cell death in a metamorphic toad; however, it was not termed ‘cell death.’ Scientists discovered different cell death pathways only in the 20th century...
01:30Apoptosis
Apoptosis is a combination of two Greek words, 'apo' and 'ptosis,' meaning separation and falling off, respectively. Hippocrates used this word to describe gangrene, which was caused due to bandaging of fractured bones. Apoptosis was distinguished from necrosis in 1970 when John Kerr reported observations of morphological changes occurring during apoptosis. During one experiment, he observed that the disruption of blood supply to the liver tissue resulted in a size reduction of the tissue.
01:35Mutations
Mutations are changes in the sequence of DNA. These changes can occur spontaneously or they can be induced by exposure to environmental factors. Mutations can be characterized in a number of different ways: whether and how they alter the amino acid sequence of the protein, whether they occur over a small or large area of DNA, and whether they occur in somatic cells or germline cells.
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...
Chromosomal Alterations Are Large-Scale Mutations
While point mutations are changes in a single nucleotide in...