関連する実験動画

Updated: Feb 17, 2026

Modeling Mitochondrial Disease Using Brain Organoids: A Focus on Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like Episodes

Modeling Mitochondrial Disease Using Brain Organoids: A Focus on Mitochondrial Encephalomyopathy, Lactic Acidosis, and Stroke-like Episodes

Published on: October 10, 2025

新しいtRNASer ((AGY) 12244G>の変異体はミトコンドリア機能を損なっており,クラシックなMELAS現象型を呈している

Xingyu Zhuang¹, Jiayin Wang¹, Jianing Wang¹

¹Department of Neurology, Shandong Key Laboratory of Mitochondrial Medicine and Rare Diseases, Research Institute of Neuromuscular and Neurodegenerative Diseases, Qilu Hospital of Shandong University, Jinan, Shandong, China.

Neurological sciences : official journal of the Italian Neurological Society and of the Italian Society of Clinical Neurophysiology

|February 15, 2026

まとめ

稀なミトコンドリアDNA変異体であるMT-TS2遺伝子のm.12244G>Aは,ミトコンドリア機能とトランスレーションを損なうことでMELAS (ミトコンドリア脳内病,乳酸酸化,脳卒中のようなエピソード) を引き起こします.

科学分野:

遺伝学遺伝学とは
分子生物学は分子生物学である.
バイオケミストリーバイオケミストリー

背景:

ミトコンドリア障害は,酸化性リン酸化 (OXPHOS) に影響する複雑な疾患です.
MELAS (ミトコンドリア脳内病,乳酸酸化,脳卒中のようなエピソード) は,ミトコンドリアtRNA遺伝子変異によってしばしば引き起こされる一般的なサブタイプです.
多くのMELASに関連した変異の正確なメカニズムは完全に理解されていません.

研究の目的:

MT-TS2遺伝子の珍しいm.12244G>A変異体の病原性を調査する.
ミトコンドリア機能に対する変種の影響の基礎となる分子機構を解明する.
MELASにおけるゲノタイプ-フェノタイプ相関の理解を広げるために.

主な方法:

患者の総合的な臨床評価,遺伝子検査,筋肉組織分析 (組織病理学,生化学分析) を行う.
ミトコンドリアトランスレーションとOXPHOSの機能的評価.
MT-TS2変種および関連する現象型に関する体系的な文献レビュー.

主要な成果:

tRNASer (AGY) 遺伝子のm.12244G>A変異を特定し,古典的なMELASフェノタイプと関連付けました.
変種によるミトコンドリア翻訳障害とOXPHOS機能障害が実証されています.
観察されたCOX陰性繊維,破片状の赤い繊維,およびミトコンドリアタンパク質レベルの低下;文献のレビューは,MT-TS2変種のための多様な現象型を明らかにしました.

結論:

m.12244G>A変種の病原性に対する実験的検証を提供した.
ミトコンドリア機能に対するその変異体の有害な影響を確認した.
MELASの既知の遺伝的原因を拡大し,mtDNA変異の機能的研究の必要性を強調した.

キーワード:

M.12244G > A型変種についてメラス (Melas) とは MT-TS2からMT-TS2までミトコンドリア疾患はミトコンドリアの病気です.ミトコンドリア脳病変 (ミトコンドリア脳病変)SLEsは,SLEsという名の企業です.トランサー (TRNASer) とは,TRNASER (TRNASER) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは,TRNASer (TRNASer) とは

さらに関連する動画

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

An In Vitro Approach to Study Mitochondrial Dysfunction: A Cybrid Model

Published on: March 9, 2022

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Genotyping Single Nucleotide Polymorphisms in the Mitochondrial Genome by Pyrosequencing

Published on: February 10, 2023

関連する概念動画

Animal Mitochondrial Genetics

Animal Mitochondrial Genetics

Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...

ATP Synthase: Mechanism

ATP Synthase: Mechanism

In animals, the mitochondrial F1F0 ATP synthase is the key protein that synthesizes ATP molecules through a complex catalytic mechanism. While the nuclear genome encodes the majority of ATP synthase subunits, the mitochondrial genome encodes some of the enzyme's most critical components. The formation of this multi-subunit enzyme is a complex multi-step process regulated at the level of transcription, translation, and assembly. Defects in one or more of these steps can result in decreased...

Translocation of Proteins into the Mitochondria

Translocation of Proteins into the Mitochondria

Mitochondrial precursors are translocated to the internal subcompartments via independent mechanisms involving distinct protein machineries called translocases.
Sorting of outer membrane proteins:
Mitochondrial outer membrane proteins are of two types: the transmembrane, beta-barrel porins, and the membrane-anchored, alpha-helical proteins. Beta-barrel porin precursors are translocated by the TOM complex and inserted into the outer mitochondrial membrane by the SAM complex. In contrast,...

Mitochondrial Precursor Proteins

Mitochondrial Precursor Proteins

Mitochondrial precursors are partially unfolded or loosely folded polypeptide chains. Newly synthesized precursors are inhibited from spontaneously folding into their native conformation by the cytosolic chaperones, heat shock proteins 70 (Hsp70), and mitochondrial import stimulation factors (MSFs). Precursors bound to MSFs are guided to the TOM70-TOM37 receptors, while precursors bound to Hsp70 chaperones are targetted to TOM20-TOM22 receptor complexes.
Most of the mitochondrial...

Mitochondrial Protein Sorting

Mitochondrial Protein Sorting

Mitochondria are double-membrane organelles of the eukaryotes involved in cellular metabolism, signaling, ATP synthesis, and programmed cell death. Each of these processes requires specific proteins and enzymes that must be correctly sorted to the right mitochondrial subcompartment for the proper functioning of the organelle.
Most of these mitochondrial proteins are encoded by the nucleus and imported to the mitochondria as unfolded or loosely folded precursors. Mitochondrial precursors...