関連する実験動画
Updated: May 12, 2026
08:48
Targeted in Situ Mutagenesis of Histone Genes in Budding Yeast
Published on: January 26, 2017
まとめ
酵母ヒストン遺伝子複製数の増加は,細胞成長に影響を与えませんでした. ヒストンのmRNAレベルは,トランスクリプトのターンオーバーが増加したため,常に維持され,トランスクリプション後の遺伝子調節を示した.
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
- イースト生物学 イースト生物学
背景:
- ヒストンはDNAの包装と遺伝子調節に不可欠です.
- ヒストン遺伝子の調節を理解することは,細胞のプロセスを理解する鍵です.
- 酵母は,基本的エウカリオット遺伝子発現を研究するためのモデル生物として機能しています.
研究 の 目的:
- ヒストン遺伝子複製数の増加が遺伝子発現に与える影響を調査する.
- 酵母ヒストンの遺伝子が用量補償を示すかどうかを判断する.
- ヒストンのmRNAレベルを制御する規制メカニズムを解明する.
主な方法:
- イーストの変異により,追加のH2A,H2B遺伝子ペアを挿入しました.
- 変形株と親株の細胞成長率をモニターした.
- ヒストンのmRNAの安定状態レベルを定量化しました.
- 転写率とmRNAのターンオーバーを分析した.
主要な成果:
- ヒストン遺伝子複製数の増加は,酵母細胞の成長に観察可能な影響はなかった.
- ヒストンH2A,H2BmRNAの安定状態レベルは,変形株では増加しなかった.
- ヒストン遺伝子の転写率は上昇したが,mRNAレベルは維持された.
- ヒストンのトランスクリプトの周回量の増加は,安定状態のレベルを維持するメカニズムとして特定されました.
結論:
- 酵母ヒストンの遺伝子は,転写後のコントロールを通して用量補償を示しています.
- ヒストンのmRNA濃度とDNA複製率の間の一定の比率は重要です.
- これは,酵母におけるヒストン遺伝子発現のための洗練された規制ネットワークを示唆している.
関連する概念動画
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
02:30Histone Variants at the Centromere
Histone variants are the histone proteins with structural and sequence variations. These variants may be regarded as “mutant” forms that replace their canonical histone counterparts in the nucleosomes. Specific post-translational modifications on the histone variants enable further chromatin complexity and regulate tissue-specific gene expression. The most common histone variants are from histone H2A, H2B, and linker histone H1 families. However, several variants of histone H3 variants are also...
03:17Inheritance 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...
02:50Dosage 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...
02:38Heterochromatin
The extent of chromatin compaction can be studied by staining chromatin using specific DNA binding dyes. Under the microscope, the dense-compacted regions that take up more dye are called heterochromatin. Heterochromatin is further classified into two forms – constitutive heterochromatin and facultative heterochromatin.
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
Constitutive heterochromatin: It is a highly compact region of chromatin that is mostly concentrated in the centromere and telomere. Unlike euchromatin, the amino acid at 9th...
02:32Histone Modification
The histone proteins have a flexible N-terminal tail extending out from the nucleosome. These histone tails are often subjected to post-translational modifications such as acetylation, methylation, phosphorylation, and ubiquitination. Particular combinations of these modifications form “histone codes” that influence the chromatin folding and tissue-specific gene expression.
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...
Acetylation
The enzyme histone acetyltransferase adds acetyl group to the histones. Another enzyme, histone deacetylase,...