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関連する概念動画

Background and Environment Affect Phenotype02:27

Background and Environment Affect Phenotype

Although the genetic makeup of an organism plays a major role in determining the phenotype, there are also several environmental factors, such as temperature, oxygen availability, presence of mutagens, that can alter an organism’s phenotype.
An example of how genetic background affects phenotype can be seen in horses. The Extension gene in horses is responsible for their coat color. A wild-type gene (EE) produces black pigment in the coat, while a mutant gene (ee) produces red pigment. A...
Hypersensitivities01:30

Hypersensitivities

Hypersensitivity, also known as a hypersensitivity reaction or allergic reaction, is a condition where the body's immune system reacts abnormally to a foreign substance. Such substances, that cause hypersensitivity are referred to as an allergen, could be something typically harmless to most people, like pollen or certain foods.
Types of Hypersensitivities
Hypersensitivity reactions are categorized into four types: Type 1, Type 2, Type 3, and Type 4. Each type has a distinct mechanism...
Disorder of Water Balance01:29

Disorder of Water Balance

Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
Drug Toxicity: Allergic Reactions01:30

Drug Toxicity: Allergic Reactions

Drug-related allergies are immune-mediated responses triggered by the administration of pharmacological agents. These hypersensitivity reactions are classified based on the immune mechanisms involved. The four primary types—Type I, II, III, and IV—are mediated by different immunological pathways and exhibit distinct clinical manifestations.Type I Hypersensitivity/ IgE-Mediated Reactions: Immunoglobulin E (IgE) immediately mediates Type I hypersensitivity reactions. Upon initial exposure to a...
Hypersensitivity Reactions: Delayed Hypersensitivity Reactions01:29

Hypersensitivity Reactions: Delayed Hypersensitivity Reactions

Delayed-Type Hypersensitivity (DTH), or Type IV hypersensitivity, is a cell-mediated immune response. It occurs when T cells, rather than antibodies, mediate a reaction to specific antigens. It is characterized by a delayed onset (1-2 days) and involves the recruitment of macrophages to the inflammation site.The initiation of a DTH response begins with the sensitization of T cells. During this phase, which lasts at least 1-2 weeks, antigen-specific T cells are activated, clonally expanded, and...
Hypersensitivity Reactions: Immune-Complex Reactions01:19

Hypersensitivity Reactions: Immune-Complex Reactions

Type III hypersensitivity reactions occur when antigen–antibody complexes form and activate the complement system. Normally, these complexes help the clearance of antigens by phagocytes and red blood cells. However, when large numbers of immune complexes are present, they can deposit in tissues—particularly in the walls of blood vessels—leading to inflammation and tissue injury. These deposits trigger complement activation and neutrophil recruitment, resulting in serum sickness, a systemic...

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関連する実験動画

Updated: Jun 11, 2026

Isolating Potentiated Hsp104 Variants Using Yeast Proteinopathy Models
08:44

Isolating Potentiated Hsp104 Variants Using Yeast Proteinopathy Models

Published on: November 11, 2014

重水に対する過敏症:新しい条件付き現象型

B Bartel1, A Varshavsky

  • 1Department of Biology, Massachusetts Institute of Technology, Cambridge 02139.

Cell
|March 25, 1988
PubMed
まとめ

研究者らは,重水 (D2O) を使用して酵母に条件付き変異を生成する新しい方法を開発しました. このD2O感受性 (ds) 変異技術は,特に温度感受性方法で容易に研究できない生物の遺伝子研究のための新しいアプローチを提供します.

科学分野:

  • 遺伝学と分子生物学について
  • イーストモデル生物 イーストモデル生物
  • バイオケミストリー バイオケミストリー

背景:

  • 野生型の酵母菌株 (Saccharomyces cerevisiae) は,重水 (D2O) に生長する.
  • 温度感受性 (ts) 変異のような従来の方法は,条件遺伝学で広く使用されています.
  • 制限は,特定の遺伝子や生物に対して,tsと冷たい感受性 (cs) のアプローチに存在する.

研究 の 目的:

  • 酵母菌におけるD2O感受性 (ds) 変異性スクリーニングの新しい方法を開発し,特徴づけること.
  • 遺伝子変異の頻度と遺伝的分布を評価する.
  • 前述の難解な遺伝子の条件変異を生成し,遺伝学におけるより広範な応用のために,ds技術の有用性を評価する.

主な方法:

  • 野生型酵母 (S. cerevisiae) の化学変異.
  • 90%のD2O媒介で成長できないが,H2O媒介で成長できる変異体のスクリーニング.
  • コンプリメンテーション分析は,コンプリメンテーショングループ全体で ds 変異の分布を決定します.
  • 他の条件付き感受性 (熱,寒さ,オスモス感受性) に関するds変異体のフェノタイプの特徴付け.

主要な成果:

さらに関連する動画

Induction and Characterization of Pulmonary Hypertension in Mice using the Hypoxia/SU5416 Model
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Induction and Characterization of Pulmonary Hypertension in Mice using the Hypoxia/SU5416 Model

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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
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Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

Published on: September 26, 2022

関連する実験動画

Last Updated: Jun 11, 2026

Isolating Potentiated Hsp104 Variants Using Yeast Proteinopathy Models
08:44

Isolating Potentiated Hsp104 Variants Using Yeast Proteinopathy Models

Published on: November 11, 2014

Induction and Characterization of Pulmonary Hypertension in Mice using the Hypoxia/SU5416 Model
07:10

Induction and Characterization of Pulmonary Hypertension in Mice using the Hypoxia/SU5416 Model

Published on: June 3, 2020

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis
08:25

Contact Hypersensitivity as a Murine Model of Allergic Contact Dermatitis

Published on: September 26, 2022

  • D2O感受性 (ds) 変異体の有意な頻度が得られ,温度感受性 (ts) 変異体と同等であった.
  • ds変異は,多数の補完群に分布していることが判明しました.
  • ほとんどのds変異体は他の条件付きフェノタイプを示さなかった;逆に,細胞分裂サイクル ts変異体はほとんどdsではなかった.

結論:

  • D2O感度 (ds) 技術は,条件変異を生成するための貴重な新しい方法です.
  • このアプローチは,従来のTSCスクリーニングに適合しない遺伝子には特に有用です.
  • ds技術は,哺乳類や鳥類を含むホメオサーミックな動物で条件付き変異体を生成する可能性を秘めています.