バイアス型ハイパーミューテーションおよび他の遺伝的変化は,人間の脳感染症における欠陥性麻疹ウイルスの欠陥性麻疹ウイルスに起因する

R Cattaneo¹, A Schmid, D Eschle

¹Institute for Molecular Biology I, University of Zürich, Switzerland.

Cell

|October 21, 1988

まとめ

持続的な麻疹ウイルス (MV) の脳内感染は,重大な変異を示します. これらの遺伝的変化,特にマトリックス遺伝子の変化は,脳細胞のウイルス伝播を促進する可能性があります.

科学分野:

ウイルス学ウイルス学ウイルス学
神経科学は神経科学である.
遺伝学遺伝学とは

背景:

亜急性硬化性汎頭炎 (SSPE) と麻疹包摂体脳炎 (MIBE) は,持続的な麻疹ウイルス (MV) 感染症の重篤な神経学的合併症です.
これらの慢性感染症の間に起こるMVの遺伝的変化を理解することは,疾患の病原性を解明するために極めて重要です.

研究の目的:

持続的な感染症におけるMV遺伝子の突然変異の状況を調査する.
観察された突然変異が,中枢神経系におけるウイルスの伝播に選択的な利点を与えるかどうかを判断する.

主な方法:

SSPEおよびMIBE患者の脳解剖から得られた全長MV遺伝子トランスクリプトのクローン.
核酸変異とそのアミノ酸配列への影響を特定するためのDNA配列解析.
インビトロトランスレーションアッセイは,遺伝子読み取りフレームの変化を確認するためのものです.

主要な成果:

持続的な感染中に約2%のMVヌクレオチドが変異し,35%がアミノ酸配列に影響を与えました.
変異は2つの融合遺伝子の読み取りフレームを変化させ,in vitro翻訳で確認されました.
MIBEマトリックス遺伝子の異なる変異群は,50%のU-to-C置換を示し,バイアスコピーイベントを示唆しました.

結論:

特に脳組織内の持続的なMV感染における累積された変異は,重要な遺伝的差異につながる可能性があります.
MIBEマトリックス遺伝子変異のような特定の変異パターンは,脳内のウイルスの持続性と伝播を好む適応的変化を表す可能性があります.
これらの発見は,MVに関連した重度の神経疾患の病原性におけるウイルス遺伝進化の役割を示唆しています.

さらに関連する動画

05:51

Intracerebroventricular and Intravascular Injection of Viral Particles and Fluorescent Microbeads into the Neonatal Brain

Published on: July 24, 2016

19.1K

05:33

A Model for Epilepsy of Infectious Etiology using Theiler's Murine Encephalomyelitis Virus

Published on: June 23, 2022

3.4K

関連する概念動画

00:36

Viral Mutations

33.2K

A mutation is a change in the sequence of bases of DNA or RNA in a genome. Some mutations occur during replication of the genome due to errors made by the polymerase enzymes that replicate DNA or RNA. Unlike DNA polymerase, RNA polymerase is prone to errors because it is not capable of “proofreading” its work. Viruses with RNA-based genomes, like HIV, therefore accrue mutations faster than viruses with DNA-based genomes. Because mutation and recombination provide the raw material...

33.2K

01:18

Viral Meningitis

217

Viral meningitis is the most common form of meningitis and is often referred to as aseptic meningitis to indicate the absence of bacterial involvement. It is generally milder than bacterial meningitis, with symptoms including fever, headache, stiff neck, drowsiness, nausea, photophobia, and vomiting. Rarely, more severe manifestations or death may occur. Common causative agents include enteroviruses, particularly coxsackie A and B viruses and echoviruses, all members of the Enterovirus genus...

217

01:25

Arboviral Encephalitis

Arboviral encephalitis refers to brain inflammation caused by arthropod-borne viruses, particularly those transmitted through mosquito vectors. Among these, West Nile virus (WNV), a member of the Flaviviridae family, is a significant public health concern. WNV is an enveloped, positive-sense, single-stranded RNA virus. Human infection typically begins when an infected mosquito introduces the virus into the dermis during feeding. The primary transmission cycle involves birds as amplifying hosts...

01:19

Encephalitis l: Introduction

Encephalitis is inflammation of the brain parenchyma, most often due to infections or autoimmune processes. It presents with neuropsychiatric features such as fever, altered mental status, behavioral changes, cognitive dysfunction, seizures, focal deficits, and sometimes autonomic instability. In some cases, the meninges are also involved, resulting in meningoencephalitis.Infectious CausesInfectious encephalitis is most commonly viral but can also result from bacterial, fungal, or parasitic...

01:26

Encephalitis ll: Pathophysiology

Encephalitis is inflammation of the brain parenchyma caused by direct viral invasion or immune-mediated mechanisms triggered by infections or tumors. Both processes lead to neuronal injury, disrupted neurotransmission, and diverse neurological symptoms, often with overlapping clinical and pathological features.Autoimmune EncephalitisIn autoimmune encephalitis, antibodies target neuronal antigens on cell surfaces, synapses, or within neurons. A key example is anti-NMDAR encephalitis, which can...

関連する実験動画