ブリッジRNAは,標的とドナーDNAの直接プログラム可能な再結合である

Matthew G Durrant^1,2, Nicholas T Perry^1,2,3, James J Pai¹

¹Arc Institute, Palo Alto, CA, USA.

Nature

|June 26, 2024

まとめ

IS110挿入配列と呼ばれる移動性遺伝子は DNAの再編成を導くために新しいRNA分子を用いますこのシステムはDNAの正確な挿入,切除,逆転を可能にし,ゲノム工学のツールを進めている.

科学分野:

遺伝学
分子生物学
生物化学

背景:

挿入や消去や逆転のようなゲノム再編成は遺伝的多様性にとって極めて重要です
これらのプロセスは通常,DNA修復酵素や移動性遺伝子要素によって媒介されます.

研究の目的:

IS110挿入配列によるゲノム再編のメカニズムを調査する.
IS110媒介による再結合における新しい非コーディングRNAの役割を特徴づける.

主な方法:

IS110要素で表現された構造化された非コーディングRNAの識別と特徴付け
IS110再結合酵素へのRNA結合を証明する生化学的測定
配列特異のDNA再結合を直接するためのRNAループの設計.

主要な成果:

IS110要素は,それらの再結合酵素に特異的に結合するブリッジRNAを発現する.
このブリッジRNAには標的とドナーのDNAと相互作用するループが含まれています
これらのループを再プログラムすることで標的のDNAの挿入,切除,逆転が可能になります

結論:

IS110ブリッジ再結合システムは,DNA操作のための新しい核酸誘導メカニズムを提供します.
このシステムは重要なゲノム設計の再編成に統一されたアプローチを提供します
CRISPRのような既存のシステムを超えてゲノム工学のツールキットを拡張します

さらに関連する動画

09:02

Subcloning Plus Insertion SPI - A Novel Recombineering Method for the Rapid Construction of Gene Targeting Vectors

Published on: January 8, 2015

16.5K

11:36

Rapid and Efficient Generation of Recombinant Human Pluripotent Stem Cells by Recombinase-mediated Cassette Exchange in the AAVS1 Locus

Published on: November 20, 2016

9.8K

関連する概念動画

02:53

Conservative Site-specific Recombination and Phase Variation

6.0K

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...

6.0K

02:31

Homologous Recombination

50.4K

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...

50.4K

00:43

Bacterial RNA Polymerase

29.4K

Unlike eukaryotes, bacteria use a single RNA Polymerase (RNAP) to transcribe all genes. The different subunits of bacterial RNAPhave distinct functions. The multisubunit structure of the bacterial RNAP helps the enzyme to maintain catalytic function, facilitate assembly, interact with DNA and RNA, and self-regulate its activity.
In most genes, the transcription site is a single base present upstream of the coding sequence. Though RNAP is a catalytically efficient enzyme, it does not recognize...

29.4K

02:13

Overview of Transposition and Recombination

15.4K

Transposons make up a significant part of genomes of various organisms. Therefore, it is believed that transposition played a major evolutionary role in speciation by changing genome sizes and modifying gene expression patterns. For example, in bacteria, transposition can lead to conferring antibiotic resistance. Movement of transposable elements within the genetic pool of pathogenic bacteria can aid in transfer of antibiotic-resistant genetic elements. In eukaryotes, transposons can carry out...

15.4K

01:23

Types of RNA

63.5K

Overview
Three main types of RNA are involved in protein synthesis: messenger RNA (mRNA), transfer RNA (tRNA), and ribosomal RNA (rRNA). These RNAs perform diverse functions and can be broadly classified as protein-coding or non-coding RNA. Non-coding RNAs play important roles in the regulation of gene expression in response to developmental and environmental changes. Non-coding RNAs in prokaryotes can be manipulated to develop more effective antibacterial drugs for human or animal use.
RNA...

63.5K

02:08

Gene Conversion

9.7K

Other than maintaining genome stability via DNA repair, homologous recombination plays an important role in diversifying the genome. In fact, the recombination of sequences forms the molecular basis of genomic evolution. Random and non-random permutations of genomic sequences create a library of new amalgamated sequences. These newly formed genomes can determine the fitness and survival of cells. In bacteria, homologous and non-homologous types of recombination lead to the evolution of new...