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人間のプロアルファ1 (I) コラーゲン遺伝子構造は,イントロンとエクソンのパターンの進化的保存を明らかにする
Nature
|July 1, 1984
まとめ
人間のプロアルファ1 (I) 遺伝子構造は,鶏のプロアルファ2 (I) 遺伝子に非常に似ており,共通の祖先単位からのタイプIコラーゲン遺伝子の進化をサポートしています. この保存された構造は,遺伝子の組織を維持するための強力な進化的圧力を強調しています.
科学分野:
- 分子生物学は分子生物学である.
- 進化生物学の進化生物学について
- 遺伝学 遺伝学とは
背景:
- コラーゲンは構造的に関連しているが,遺伝的に異なるタンパク質です.
- I型コラーゲンは,最も豊富な脊椎動物のコラーゲンであり,ドメインを繰り返す特定のプロアルファ鎖で構成されています.
- 以前の研究では,コラーゲン遺伝子が鶏のプロアルファ2 (I) 遺伝子構造に基づく共通の祖先単位から進化したと示唆されていました.
研究 の 目的:
- 人間のプロアルファ1 (I) 遺伝子の完全な構造を提示するために.
- 人間のプロアルファ1 (I) 遺伝子構造と鶏のプロアルファ2 (I) 遺伝子を比較する.
- I型コラーゲン遺伝子の進化的起源のさらなる証拠を提供するために.
主な方法:
- ヒトのプロアルファ1 (I) 遺伝子の遺伝子構造分析.
- 人間のプロアルファ1 (I) と鶏のプロアルファ2 (I) の遺伝子構造の比較分析.
主要な成果:
- ヒトのプロアルファ1 (I) 遺伝子は,鶏のプロアルファ2 (I) 遺伝子と非常に似たエクソン配列を示しています.
- ヒトのプロアルファ1 (I) 遺伝子は,より短いイントロンのため,よりコンパクトです.
- この発見は,I型コラーゲン遺伝子の共通の複数のエクソンを持つ祖先単位の仮説を裏付けている.
結論:
- I型コラーゲン遺伝子は,祖先のマルチエクソン単位から進化した.
- 強い進化的圧力が,この複雑な遺伝子構造を,その誕生以来維持してきた.
関連する概念動画
Organization of Genes
Overview
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Multi-species Conserved Sequences
Next-generation sequencing technologies have created large genomic databases of a variety of animals and plants. Ever since the human genome project was completed, scientists studied the genome of primates, mammals, and other phylogenetically distant living beings. Such large-scale studies have provided new insights into the evolutionary relationship between organisms.
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Although the genome of each species varies greatly from each other, a few sequences are highly conserved. Such conserved DNA...
Exon Recombination
The evolution of new genes is critical for speciation. Exon recombination, also known as exon shuffling or domain shuffling, is an important means of new gene formation. It is observed across vertebrates, invertebrates, and in some plants such as potatoes and sunflowers. During exon recombination, exons from the same or different genes recombine and produce new exon-intron combinations, which might evolve into new genes.
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Exon shuffling follows “splice frame rules.” Each exon has three reading...
Alternative RNA Splicing
Alternative RNA splicing is the regulated splicing of exons and introns to produce different mature mRNAs from a single pre-mRNA. Unlike in constitutive splicing where a single gene produces a single type of mRNA, alternative splicing allows an organism to produce multiple proteins from a single gene and plays an important role in protein diversity.
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
There are five types of alternative RNA splicing that vary in the ways the pre-mRNA segments are removed or retained in the mature mRNA. The first...
Collagens are the Major Structural Proteins of ECM
Three main types of fibers are secreted by fibroblasts: collagen fibers, elastic fibers, and reticular fibers. Collagen fiber is made from fibrous protein subunits linked together to form a long, straight fiber. Collagen fibers, while flexible, have great tensile strength, resist stretching, and give ligaments and tendons their characteristic resilience and strength. These fibers hold connective tissues together, even during the body's movement.
Connective tissue proper includes loose...
Connective tissue proper includes loose...

