XCDT1は,Xenopus laevisの複製前複合体の組み立てに必要とされる
D Maiorano1, J Moreau, M Méchali
1Institute of Human Genetics, CNRS, Genome Dynamics and Development, Montpellier, France.
Nature
|April 15, 2000
まとめ
科学者たちは,脊椎動物のDNA複製に不可欠なタンパク質であるXCDT1を発見しました. XCDT1は,MCMタンパク質のクロマチンへの正しい負荷を保証し,S段階のDNA合成の開始を調節します.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- ユカリオットにおける染色体DNAの複製は,複製の起源における複製前複合体によって開始される.
- これらの複合体の形成と維持はCDC6に依存し,DNA複製のためのMCM2-7タンパク質組成を促進します.
- 複製ライセンスには,MCMタンパク質をクロマチンに組み立て,S相の起源調節発火中に除去することが含まれます.
研究 の 目的:
- 複製前の複合組立に関与する新しい要因を特定する.
- DNA複製における,新たに特定された脊椎動物のタンパク質,XCDT1の役割を特徴づける.
主な方法:
- クセノプスの母性発現遺伝子のスクリーニング.
- DNA複製の研究のためにXenopus in vitroシステムを活用する.
- 免疫低下と復元実験を用いて.
主要な成果:
- 分裂酵母cdt1の脊椎動物同型であるXCDT1が特定され,染色体DNA複製に不可欠であることが判明しました.
- XCDT1は,ORCに依存した方法で,複製前クロマチンと結合し,DNA合成の開始時に除去されます.
- XCDT1は,MCM2-7タンパク質をプリレプリケーションクロマチンにロードするために必要です.
結論:
- XCDT1は,脊椎動物における複製前複合体の組み立てに不可欠な構成要素である.
- XCDT1は,細胞サイクルのS段階の起源発火を調節する上で重要な役割を果たします.
関連する概念動画
01:58X-Inactivation
39.0K
The human X chromosome contains over ten times the number of genes as in the Y chromosome. Since males have only one X chromosome, and females have two, one might expect females to produce twice as many of the proteins, with undesirable results.
39.0K
03:17Inheritance of Chromatin Structures
6.0K
Epigenetics is the study of inherited changes in a cell's phenotype without changing the DNA sequences. It provides a form of memory for the differential gene expression pattern to maintain cell lineage, position-effect variegation, dosage compensation, and maintenance of chromatin structures such as telomeres and centromeres. For example, the structure and location of the centromere on chromosomes are epigenetically inherited. Its functionality is not dictated or ensured by the underlying...
6.0K
02:50Dosage Compensation
6.4K
In animals, gender is determined by the number and type of sex chromosome. For example, human females have two X chromosomes, and males have one X and one Y chromosome, whereas C.elegans with one X chromosome is a male, and the one with two X chromosomes is a hermaphrodite.
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
In addition to sexual development, the X chromosome has genes involved in autosomal functions such as brain development and the immune system. Therefore, males and females with distinct numbers of X chromosomes will...
6.4K
02:32Exon Recombination
3.1K
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...
Exon shuffling follows “splice frame rules.” Each exon...
3.1K
02:38S-Cdk Initiates DNA Replication
4.8K
The cell cycle is a series of events leading to DNA duplication followed by the division of cell content to form two daughter cells. The cell cycle progresses in four stages—the cell increases in size (gap 1 or G1-phase), duplicates its DNA (synthesis or S-phase), prepares to divide (gap 2 or G2-phase), and divides (mitosis or M-phase).
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
Two states at the origin of replication
In eukaryotes, the initiation of replication occurs at many sites on the chromosomes, called the origins of...
4.8K