関連する実験動画
Updated: Jul 15, 2026

11:19
Ploidy Manipulation of Zebrafish Embryos with Heat Shock 2 Treatment
Published on: December 16, 2016
まとめ
XXYカリオタイプのトリプロイド細胞は,安定したX染色体発現を示し,一貫したG6PD同酵素比率を維持しています. 細胞融合やSV40変異後でも,このX染色体フェノタイプは安定していた.
科学分野:
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
- 分子生物学は分子生物学である.
背景:
- X染色体不活性化は,哺乳類の発達における重要なプロセスです.
- X染色体の安定性を理解することは,遺伝子研究において極めて重要です.
研究 の 目的:
- トリプロイド細胞におけるX染色体フェノタイプの安定性を調査する.
- X染色体発現に対する自己相補の影響を決定する.
- ハイブリッド細胞とSV40変異細胞におけるX染色体の活性を分析する.
主な方法:
- トリプロイド細胞におけるグルコース6リン酸脱水素酶 (G6PD) の電泳性変異体の分析.
- 人間の二倍体繊維芽細胞による細胞融合実験.
- ネズミの線維芽細胞との種間ハイブリッドの生成.
- トリプロイド細胞のSV40変換とその後の分析.
主要な成果:
- トリプロイドXXY細胞は,G6PD同酵素 (A:ヘテロポリマー:B) の安定した1:2:1比を維持しました.
- 細胞融合と異種間ハイブリダイゼーションの実験で,X染色体の活動維持が確認されました.
- SV40変異はLDHパターンと染色体数を変化させたが,G6PD現象型は変化しなかった.
- 融合実験では,不活性X染色体の減圧は観察されなかった.
結論:
- X染色体フェノタイプは,様々な実験条件下でトリプロイド細胞で安定しています.
- オートゾーム補完は,X染色体発現の安定性を乱すようには見えない.
- 染色体またはオートソームの分離は,ハイブリッド細胞系で発生する可能性があります.
関連する概念動画
Crossing Over
Unlike mitosis, meiosis aims for genetic diversity in its creation of haploid gametes. Dividing germ cells first begin this process in prophase I, where each chromosome—replicated in S phase—is now composed of two sister chromatids (identical copies) joined centrally.
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
The homologous pairs of sister chromosomes—one from the maternal and one from the paternal genome—then begin to align alongside each other lengthwise, matching corresponding DNA positions in a process called synapsis.
In order to...
X-Inactivation
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.
Inheritance of Chromatin Structures
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 DNA...
The Ratio of X Chromosome to Autosomes
In most organisms, sex is determined by the ratio of X and Y chromosomes. However, in some organisms, such as Drosophila and C.elegans, sex is determined by the ratio of the number of X chromosomes to the number of sets of autosomes. The Y chromosome in Drosophila is active but does not determine sex. It contains genes responsible for the production of sperms in adult flies.
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Normal male Drosophila has a ratio of one X chromosome to two sets of autosomes. In contrast, normal female Drosophila...
Dosage Compensation
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 have...
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 have...
X-inactivation
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.

