まとめ
天然のオバルブミン遺伝子は,8つのコード配列を含み,7つの非コード配列によって隔てられている. この遺伝子構造は,分子ハイブリド化と制限マッピング技術によって明らかにされました.
科学分野:
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
- バイオケミストリー バイオケミストリー
背景:
- オバルブミン遺伝子は,真核生物の遺伝子構造のよく研究されたモデルである.
- 遺伝子組織を理解することは,遺伝子発現と調節を解読する上で極めて重要です.
研究 の 目的:
- 自然のオバルブミン遺伝子の構造的組織を解明する.
- 遺伝子内のコーディング領域と非コーディング領域を特定し,特徴づけること.
主な方法:
- オバルブミン遺伝子のEcoRI断片のクローニング.
- 成熟したオバルブミンmRNAを用いたハイブリデーション研究.
- 構造的視覚化のための電子顕微鏡.
- 制限酵素のマッピングにより,正確な局所化が可能になります.
- 限られたDNA配列分析.
主要な成果:
- オバルブミンの構造遺伝子は隣接していない.
- 8つの異なるコード配列 (エクソン) が特定されました.
- これらのコード配列は7つの間隔配列 (イントロン) によって分離されています.
- その間隔のシーケンスには長さが異なり,順番的に配置されています.
結論:
- オバルブミン遺伝子は分裂遺伝子構造を示しており,これはエウカリウトに共通する特徴である.
- イントロンの存在は,遺伝子処理と遺伝子調節に大きな影響を与えます.
- この詳細な構造分析は,卵白蛋白遺伝子のさらなる機能研究のための基礎を提供します.
関連する概念動画
From DNA to Protein
The flow of genetic information in cells from DNA to mRNA to protein is described by the central dogma, which states that genes specify the sequence of mRNAs, which in turn specify the sequence of amino acids making up all proteins. The decoding of one molecule to another is performed by specific proteins and RNAs. Because the information stored in DNA is so central to cellular function, it makes intuitive sense that the cell would make mRNA copies of this information for protein synthesis...
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...
Leaky Scanning
During most eukaryotic translation processes, the small 40S ribosome subunit scans an mRNA from its 5' end until it encounters the first start AUG codon. The large 60S ribosomal subunit then joins the smaller one to initiate protein synthesis. The location of the translation initiation is largely determined by the nucleotides near the start codon as there may be multiple translation initiation sites present on the mRNA. Marilyn Kozak discovered that the sequence RCCAUGG (where R stands for...
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...
Structure of a Gene
A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...


