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02:53Conservative Site-specific Recombination and Phase Variation
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Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
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01:16In-vitro Mutagenesis
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To learn more about the function of a gene, researchers can observe what happens when the gene is inactivated or “knocked out,” by creating genetically engineered knockout animals. Knockout mice have been particularly useful as models for human diseases such as cancer, Parkinson’s disease, and diabetes.
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02:41Lethal Alleles
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Agouti: A Lethal Allele
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
Lucien Cuénot discovered lethal alleles in 1905 while studying the inheritance of coat color in mice. The agouti gene is responsible for the color of the coat in mice. This gene codes for an agouti-signaling protein, which is responsible for melanin distribution in mammals. The wild-type allele gives rise to gray-brown coat color in mice, while the mutant allele gives rise to yellow coat color. In addition to coat color, the agouti gene is associated with the yellow...
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02:32Position-effect Variegation
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In 1928, a German botanist Emil Heitz observed the moss nuclei with a DNA binding dye. He observed that while some chromatin regions decondense and spread out in the interphase nucleus, others do not. He termed them euchromatin and heterochromatin, respectively. He proposed that the heterochromatin regions reflect a functionally inactive state of the genome. It was later confirmed that heterochromatin is transcriptionally repressed, and euchromatin is transcriptionally active chromatin.
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Affinity-optimizing enhancer バリアントは開発を妨害する
Fabian Lim1,2,3, Joe J Solvason1,2,4, Genevieve E Ryan1,2
1Department of Medicine, University of California San Diego, La Jolla, CA, USA.
Nature
|January 17, 2024
まとめ
ZRS 肢体発達の遺伝子調節剤のような不適切な結合部位は,単核酸変異体 (SNVs) が結合親和性をわずかに増加させ,遺伝子発現と疾患を変化させるとポリダクチリアを引き起こす可能性があります.
科学分野:
- 遺伝学
- 発達生物学
- 分子生物学
背景:
- 強化剤は遺伝子発現のタイミングと位置を調節し,ほとんどの疾患に関連した変異を宿している.
- ZRS (ゾーン・オブ・ポラライジング・アクティビティ・レギュレーション・シーケンス) は,脊椎動物の重要な強化体であり,四肢の発達におけるShh発現を制御する.
- ZRSにおけるヒト単核酸変種 (SNV) は多ダクティリアに関連しているが,その根本的なメカニズムは不明である.
研究 の 目的:
- ZRSが組織特異的な活動をどのようにコードするかを調査する.
- ZRS SNV が多爪症を引き起こすメカニズムを解明する.
- 結合部位の親和が強化剤の機能と疾患の病原性における役割を理解する.
主な方法:
- ZRS内のETS結合部位の親和性の分析
- ヒトSNVと合成変種をZRSに導入し,ETS-A結合親和性への影響を評価する.
- ポリダクティリアのフェノタイプと 結合親和度の変化の評価
- 様々な増強剤における他の転写因子結合部位 (ETS,IRF,HOX,AP-1) に対するSNV効果の検討
主要な成果:
- ZRSのETS部位は,非常に敏感なETS-A部位を含む低結合親和性を表しています.
- ヒトの特定のSNVと合成変異体は,ETS-A結合親和性を微妙に増加させ (15%から~25%),一貫した浸透性と重症性を有するポリダクティリアを引き起こす.
- 結合親和度の上昇は,より重症で浸透性のあるポリダクティリアのフェノタイプと相関する.
- 複数の増強剤にわたる様々な転写因子結合部位における親和性最適化SNVは,機能増強遺伝子発現につながります.
結論:
- 強化剤におけるサブ最適の結合部位親和性は,ゲノムの脆弱性を表しています.
- 結合親和性をわずかに最適化するSNVは病原性であり,ポリダクティリアのような疾患を引き起こす可能性があります.
- アフィニティ最適化SNVを特定することは,エンハンサー病における因果的な変異を特定するためのメカニズム的アプローチを提供します.