症候群性自閉症を引き起こす変異は,シナプス病理生理学の軸を定義する
Benjamin D Auerbach1, Emily K Osterweil, Mark F Bear
1Howard Hughes Medical Institute, The Picower Institute for Learning and Memory, Department of Brain and Cognitive Sciences, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139, USA.
Nature
|November 25, 2011
まとめ
知的障害や自閉症は,神経細胞の異常なタンパク質合成に起因する可能性があります. この研究は,結核性硬化症複合体や脆弱X症候群のような遺伝疾患におけるシナプスと認知の欠陥は,最適な範囲内のタンパク質合成を調節することによって修正できることを明らかにしています.
科学分野:
- 神経科学は神経科学である.
- 遺伝学 遺伝学とは
- 発達生物学 発達生物学について
背景:
- 結核性硬化症複合体 (TSC) と脆性X症候群 (FXS) は,知的障害と自閉症に関連する遺伝疾患です.
- 両方の症状は,神経細胞のタンパク質合成を調節する遺伝子の変異を伴うため,核のメカニズムとして過剰なタンパク質合成の仮説が提唱されています.
- これらの疾患におけるタンパク質合成の正確な役割を理解することは,効果的な治療法の開発に不可欠です.
研究 の 目的:
- TSCとFXSの病理生理学におけるニューロンタンパク質合成の役割を調査する.
- TSCとFXSのマウスモデルにおけるシナプスと認知の欠陥が,タンパク質合成に関連する生理学的スペクトルの反対端にあるかどうかを判断する.
- メタボトロピクグルタミン酸受容体5 (mGluR5) とTSCとFXSの間の遺伝的相互作用を標的とした治療戦略を探求する.
主な方法:
- 電気生理学的および生化学的測定は,Tsc2(+/-) とFmr1(-/y) のマウスの海馬におけるニューロンタンパク質合成を測定するために使用されました.
- mGluR5の薬理学的な調節は,シナプス,生化学,および認知の欠陥に対する効果を評価するために使用されました.
- Tsc2とFmr1の両方の変異を持つ繁殖マウスを用いて遺伝子分析を行った.
主要な成果:
- Tsc2(+/-) とFmr1(-/y) のマウスのシナプス機能障害は,タンパク質合成スペクトルの反対端で発生しました.
- 両方の変異体の欠陥は,mGluR5調節の反対方向によって改善された.
- 認知機能とシナプス機能の障害は,同じマウスに両方の突然変異がある場合に救われました.
結論:
- 正常なシナプス可塑性と認知は,mGluR5媒介タンパク質合成の最適な範囲内で維持されます.
- どちらの方向のタンパク質合成の偏差は,TSCとFXSで観察された共有行動障害につながる可能性があります.
- これらの発見は,タンパク質合成の調節に関連する知的障害と自閉症の共通の根本的なメカニズムを示唆しています.
関連する概念動画
01:19Autism Spectrum Disorder
Autism spectrum disorder (ASD) is a neurodevelopmental condition marked by persistent deficits in social communication and interaction alongside restrictive and repetitive behaviors or interests. ASD is sometimes accompanied by intellectual impairment.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
These core symptoms manifest differently among individuals, ranging from mild to severe. The disorder's complexity extends beyond its clinical presentation, encompassing a diverse range of biological, cognitive, and sociocultural influences.
01:27Psychosis: Pathophysiology of Schizophrenia and Other Psychotic Disorders
Schizophrenia is a neurodevelopmental disorder whose origins are rooted in complex genetic components. Despite our burgeoning understanding, the pathophysiology of this disorder remains incompletely deciphered.
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
Researchers have identified genetic factors that increase susceptibility to schizophrenia, underscoring the intricate interplay between genetics and environment in disease development. At the core of schizophrenia's pathophysiology is excessive dopaminergic neurotransmission within the...
01:29Biological Causes of Schizophrenia
Schizophrenia, a severe psychiatric disorder, arises from a complex interplay of biological factors, including genetic predisposition, structural brain abnormalities, neurotransmitter dysregulation, and developmental irregularities. These factors collectively contribute to the onset and progression of the disorder, which typically manifests in late adolescence or early adulthood.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
Genetic Factors in Schizophrenia
The genetic basis of schizophrenia is strongly supported by family and twin studies.
01:43Sex-linked Disorders
Like autosomes, sex chromosomes contain a variety of genes necessary for normal body function. When a mutation in one of these genes results in biological deficits, the disorder is considered sex-linked.
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
01:26Chemical Synapses
Chemical synapses are specialized sites between two neurons or between a neuron and a non-neuronal cell like a muscle, glandular or sensory cell.
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...
Because chemical synapses depend on the release of neurotransmitter molecules from synaptic vesicles to pass on their signal, there is an approximately one millisecond delay between when the axon potential reaches the presynaptic terminal and when the neurotransmitter leads to opening of postsynaptic ion channels. Additionally, this signaling is...