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Initiation of Translation02:33

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Initiating translation is complex because it involves multiple molecules. Initiator tRNA, ribosomal subunits, and eukaryotic initiation factors (eIFs) are all required to assemble on the initiation codon of mRNA. This process consists of several steps that are mediated by different eIFs.
First, the initiator tRNA must be selected from the pool of elongator tRNAs by eukaryotic initiation factor 2 (eIF2). The initiator tRNA (Met-tRNAi) has conserved sequence elements including modified bases at...
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Initiation of Translation02:33

Initiation of Translation

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Fixed Action Patterns01:06

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A fixed action pattern (FAP) is a specific, hard-wired sequence of behaviors that occurs in response to an external stimulus, called a sign stimulus. The behavior is “fixed” because it is essentially unchangeable—proceeding similarly across individuals of a species every time it occurs.
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Underflow gates are vital for controlling water flow in irrigation canals. The three main types of underflow gates — vertical, radial, and drum gates — serve different purposes while ensuring effective flow management. Vertical gates move up and down, generating a free-flowing water jet; radial gates pivot to regulate the flow; and drum gates rotate for precise adjustments. The flow through these gates is influenced by downstream conditions, resulting in free or drowned outflow.Free and...
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Initiation is the first step of transcription in eukaryotes. Prokaryotic RNA Polymerase (RNAP) can bind to the template DNA and start transcribing. On the other hand, transcription in eukaryotes requires additional proteins, called transcription factors, to first bind to the promoter region in the DNA template. This binding helps recruit the specific RNAP that can assemble on the DNA and start transcription.
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Ligand-gated ion channels are transmembrane proteins that play a vital role in intercellular communication and functions of the nervous system. They allow the influx of ions across the membrane once the neurotransmitter binds, allowing the subsequent transmission of electrical excitation across the neurons. Other ligand-gated ion channels, like the γ-aminobutyric acid (GABA) receptor, permit anions like chloride into the cells on the binding of the GABA molecule. Their entry into the cell...
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Subcellular Patch-clamp Recordings from the Somatodendritic Domain of Nigral Dopamine Neurons
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ドーパミンニューロンの活動は,行動開始ゲート前に,将来の動きを活性化します.

Joaquim Alves da Silva1,2, Fatuel Tecuapetla1,3, Vitor Paixão1

  • 1Champalimaud Neuroscience Programme, Champalimaud Centre for the Unknown, Lisbon, Portugal.

Nature
|February 9, 2018
PubMed
まとめ

ドーパミンニューロン (DANs) は,運動開始前に一時的に活性化し,運動活力に影響を与えます. これらのDANを抑制したり活性化したりすると 移動の確率と活力に直接影響し 生存に不可欠です

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科学分野:

  • 神経科学
  • モーター コントロール
  • パーキンソン病の研究

背景:

  • ドーパミンニューロン (DANs) は,黒い物質のパースコンパクト (SNc) において,運動に不可欠であり,その喪失はパーキンソン病に関連しています.
  • 以前のモデルでは,自律運動における DAN の役割は,トニック活動と関連付けられ,相変化は報酬予測と関連付けられていた.

研究 の 目的:

  • 自発的な運動の開始前に一時的なドーパミンニューロン活動の必要性と特定の役割を調査する.
  • ドーパミンの活動が 運動開始と進行中の運動に及ぼす影響を区別する.

主な方法:

  • ネズミのSNc DANの活動が自己制御運動で記録された.
  • 静止中の特定のDAN群の抑制と活性化.
  • 運動開始,確率,活力に対する観察された影響.

主要な成果:

  • SNc DANのサブセットは,報酬とは関係なく,自己ペースの運動開始前に一時的な活動増加を示した.
  • この移動前のDAN活動は,将来の運動活力と相関しています.
  • DANを抑制すると 運動の確率と活力が低下し,活性化すると これらのパラメータが増加する.
  • 移動開始後の操作は進行中の移動に影響を与えなかった.

結論:

  • 運動開始前の一時的なSNc DAN活動は,将来の運動の確率と活力に影響します.
  • この発見は,DANが報酬処理や継続的な運動制御における役割とは異なる,自発的で学習された行動を開始することを意味しています.