分子生物学. 分子生物学. 境界線を定める母親たち
J L Thorvaldsen1, M S Bartolomei
1Howard Hughes Medical Institute and Department of Cell and Developmental Biology, University of Pennsylvania School of Medicine, Philadelphia, PA 19104, USA. thorvald@mail.med.upenn.edu
Science (New York, N.Y.)
|July 15, 2000
まとめ
遺伝子インプリントは,遺伝子コピーの1つしかアクティブでない場合,インシューラエレメントによって沈黙させることができます. これらの境界領域は,増強剤-促進剤の相互作用をブロックし,遺伝子静止のためのメチル化を超えた新しいメカニズムを提供します.
科学分野:
- 遺伝学 遺伝学とは
- エピジェネティクス エピジェネティクス
- 分子生物学は分子生物学である.
背景:
- ゲノムインプリントは,親の起源に基づいて遺伝子の差異的発現を伴う.
- メチル化は,インプリントされた遺伝子を静止させるための既知のエピジェネティックメカニズムです.
- しかし,すべてのインプリントされた遺伝子がメチル化によって静止されるわけではありません.
研究 の 目的:
- ゲノムインプリントにおける代替的な遺伝子サイレンスメカニズムに関する新たな証拠について議論する.
- 遺伝子調節とインプリントングにおける絶縁体要素の役割を強調する.
主な方法:
- 遺伝子インプリントに関する最近の発見のレビューと合成.
- 遺伝子発現における断熱要素の機能の分析.
- エピジェネティック規制メカニズムの議論.
主要な成果:
- 境界領域として作用する絶縁要素は,増強剤がプロモーターを活性化するのを防ぐことができます.
- このエンハンサー・プロモーターのコミュニケーションの混乱は,インプリントにおける遺伝子サイレンシングのための新しいメカニズムを表しています.
- このメカニズムは,メチル化によって調節されないインプリントされた遺伝子の静止を説明するかもしれない.
結論:
- ゲノムインプリントは,アレル特異的な遺伝子サイレンシングのための多様な表遺伝的メカニズムを使用します.
- 隔離エレメントは,インプリントされた遺伝子発現を制御するための非メチル化依存の経路を提供します.
- インプリントおよびその他の遺伝子調節プロセスにおける絶縁剤の役割を完全に解明するには,さらなる研究が必要である.
関連する概念動画
00:55Parental Care
Many animals exhibit parental care behavior, including feeding, grooming, and protecting young offspring. Parental care is universal in mammals and birds, which often have young that are born relatively helpless. Several species of insects and fish, as well as some amphibians, also care for their young.
01:17Understanding Species and Reproductive Barriers
A species is a group of organisms that interbreed and produce fertile offspring. Typically, individuals of the same species appear similar and share common characteristics due to their highly similar genomes. However, not all organisms that look alike are members of the same species. Various mechanisms keep most species discrete. While some mechanisms prevent reproductive behavior and fertilization (pre-zygotic isolation), others prevent the production of fertile offspring after mating has...
02:59Animal Mitochondrial Genetics
Among all the organelles in an animal cell, only mitochondria have their own independent genomes. Animal mitochondrial DNA is a double-stranded, closed-circular molecule with around 20,000 base pairs. Mitochondrial DNA is unique in that one of its two strands, the heavy, or H, -strand is guanine rich, whereas the complementary strand is cytosine rich and called the light, or L, -strand. Compared to nuclear DNA, mitochondrial DNA has a very low percentage of non-coding regions and is marked by...
02:30Genomic Imprinting and Inheritance
Diploid organisms inherit genetic material through chromosomes from both parents. Copies of the same gene are known as alleles. In most cases, both alleles are simultaneously expressed and allow various cellular processes to function optimally. If one of the alleles is missing or mutated, the expression of the other allele can compensate; however, this is not true for all genes.
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
The expression of some genes depends on which parent passed the gene to the offspring, through a phenomenon known as...
01:27Molecular Factors Affecting Cell Division
Several external and internal factors influence the initiation and inhibition of cell division. For instance, the death of nearby cells or the release of human growth hormone (hGH) promotes cell division. In contrast, lack of hGH or crowding of cells can inhibit cell division.
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
Several proteins function as internal regulators to ensure each cell cycle stage is completed faithfully before proceeding to the next. Regulator molecules may act directly or influence the activity or production of other...
01:29Modern Molecular Taxonomy
Advancements in molecular biology have revolutionized the identification and characterization of bacteria, with multiple methods leveraging DNA sequencing for enhanced precision. As sequencing technologies improve and costs decline, these approaches are increasingly used in clinical, environmental, and evolutionary studies.Multilocus Sequence Typing (MLST) examines several housekeeping genes, essential chromosomal genes encoding cellular functions, to distinguish strains. Approximately...