テトラヒメナ・サーモフィラのプログラムされたサイト固有のDNAの再編成には,ポリピュリン経路の側面が必要である
Cell
|June 29, 1990
まとめ
科学者は,シリアトマクロ核発達の過程で正確なDNAセグメント切除に不可欠なDNAの繰り返しの近くにあるポリピュリン経路を特定しました. この発見は,ゲノム再編成メカニズムに関する理解を深める.
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
- 細胞生物学 細胞生物学
背景:
- シリア性マクロ核の発達には,数千の特定のDNAセグメントの正確な削除が含まれています.
- これらのセグメントは短い直接の繰り返しで囲まれていますが,切除のための重要なシス作用の配列はほとんど不明のままです.
研究 の 目的:
- テトラヒメナマクロ核発達の過程でDNA消去に関与する重要なシス作用配列を特定する.
- 特定のDNA領域の認識と切除における側面配列の役割を明らかにする.
主な方法:
- テトラヒメナでDNA消去プロセスを分析するためのインビボシステムの開発.
- 切除の標的となるDNAセグメントの70bp内部の配列の分析.
- ポリピュリン経路と隣接するスプライス部位が切除効率に与える影響の調査.
主要な成果:
- 重要な認識と切除の配列は,DNAセグメントを横切る70bp以内に位置しています.
- 珍しいポリピュリン管 (5'-A5G5) は,正規のスプライス・サイトと暗号のスプライス・サイトに隣接しており,端末の繰り返しから40~50bp離れたところにある.
- ポリピュリン管の除去または変異は,隣接する部位へのスプライシングを廃止し,切除を防ぐ.
- 切除は,正常な染色体環境と除去された配列の完全性とは無関係に起こる.
結論:
- ポリピュリン管は,毛皮細胞のマクロ核発達の過程で特定のDNA配列の切除に不可欠な重要な信号として機能する.
- この発見は,シリエットのプログラムされたDNAの削除を制御する分子機構に関する新しい洞察を提供します.
関連する概念動画
Mismatch Repair
38.1K
Overview
38.1K
The Replisome
31.2K
DNA replication is carried out by a large complex of proteins that act in a coordinated matter to achieve high-fidelity DNA replication. Together this complex is known as the DNA replication machinery or the replisome.
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
The synthesis of the leading and lagging strands is a highly coordinated process. To explain this, the “Trombone model” was proposed by Bruce Alberts in 1980. The DNA loop formation starts when a primer is synthesized on the parent lagging strand. The loop grows with...
31.2K
Translesion DNA Polymerases
9.3K
Translesion (TLS) polymerases rescue stalled DNA polymerases at sites of damaged bases by replacing the replicative polymerase and installing a nucleotide across the damaged site. Doing so, TLS allows additional time for the cell to repair the damage before resuming regular DNA replication.
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
TLS polymerases are found in all three domains of life - archaea, bacteria, and eukaryotes. Of the different classes of TLS polymerases, members of the Y family are fitted with specialized structures that...
9.3K
Homologous Recombination
58.8K
The basic reaction of homologous recombination (HR) involves two chromatids that contain DNA sequences sharing a significant stretch of identity. One of these sequences uses a strand from another as a template to synthesize DNA in an enzyme-catalyzed reaction. The final product is a novel amalgamation of the two substrates. To ensure an accurate recombination of sequences, HR is restricted to the S and G2 phases of the cell cycle. At these stages, the DNA has been replicated already and the...
58.8K
Conservative Site-specific Recombination and Phase Variation
5.7K
Because the DNA segments are cut and reorganized in a direction-specific manner, site-specific recombination has emerged as an efficient genetic engineering technique. Flippase and Cyclization recombinases or Flp and Cre, respectively, are two members of the tyrosine recombinase family derived from bacteriophages, that are used to mediate site-specific DNA insertions, deletions, and targeted expression of proteins in mammalian cell lines.
The recognition sites for Cre recombinase called LoxP...
The recognition sites for Cre recombinase called LoxP...
5.7K
Mismatch Repair
5.4K
Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
The Mutator Protein Family Plays a Key Role in DNA Mismatch Repair
The human genome has more than 3 billion base pairs of DNA per cell. Prior to cell division, that vast amount of genetic...
5.4K


