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Updated: Jul 9, 2026

09:40
Functional Cloning Using a Xenopus Oocyte Expression System
Published on: January 30, 2016
まとめ
Xenopus laevis 5SのDNAは,重複単位で長さの変動を示しており,特にA+Tに富んだ間隔領域内にある. この異質性は,15塩基対のサブリピート数の違いから生じる.
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
- ゲノミクスゲノミクスとは
背景:
- Xenopus laevis 5S DNAは,約700塩基対の長さで繰り返される単位で構成されています.
- 制限酵素Hind IIIとHae IIIはDNA構造を分析するために使用されます.
研究 の 目的:
- Xenopus laevis 5S DNAの重複単位内の制限酵素Hind IIIとHae IIIの分裂部位をマッピングする.
- Xenopus laevis 5S DNAの重複単位で観察された長さの異質性の原因を調査する.
主な方法:
- Hind IIIとHae IIIによる制限酵素消化です.
- 制限断片のデナチュレーションマッピング.
- DNA断片の長さの分析.
主要な成果:
- ヒンドIIIとハエIIIの割れ部位は5SDNA複製ユニット内に位置していた.
- Hind III製品と1つのHae III断片は長さの変化を示し,繰り返すユニットの異質性を示した.
- 長さの異質性は,A+Tに富んだスペーサー領域に局限していた.
- 繰り返す単位は,15塩基対の離散的な増加で変化した.
結論:
- Xenopus laevis 5SのDNAの繰り返し単位における長さの異質性は,スペース領域に限定されています.
- この異質性は,スペーサー内のタンドム15塩基対のサブリピート数の変数によって引き起こされる可能性が高い.
関連する概念動画
Replication in Eukaryotes
Overview
Chromatin Packaging
Each human somatic cell contains 6 billion base-pairs of DNA. Each base-pair is 0.34 nm long, which means that each diploid cell contains a staggering 2 meters of DNA. How is such a long DNA strand packed inside a nucleus measuring only 10 - 20 microns in diameter?
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
The chromatin
In combination with specialized DNA binding protein called Histones, the DNA double helix forms a compact DNA: protein complex called chromatin. The chromatin itself is further compacted into higher-order structures.
Lampbrush Chromosomes
In 1882, Flemming observed lampbrush chromosomes (LBC) in salamander eggs. Later in 1892, Rückert observed LBCs in shark egg cells and coined the term "lampbrush chromosomes" because they looked like brushes used to clean kerosene lamps.
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
LBCs are made up of two pairs of conjugating homologous chromatids. Each chromatid consists of alternatively positioned regions of condensed-inactive chromatin and loosely placed-active side loops, which can be contracted and extended. The loops resemble the...
Polytene Chromosomes
Polytene chromosomes are giant interphase chromosomes with several DNA strands placed side by side. They were discovered in the year 1881 by Balbiani in salivary glands, intestine, muscles, malpighian tubules, and hypoderm of larvae Chironomus plumosus. Hence, these are also called "Salivary gland chromosomes." These are found in insects of the order Diptera and Collembola; in certain organs of mammals; and synergids, antipodes of flowering plants. Polytene chromosomes are also regularly...
Replication in Eukaryotes
In eukaryotic cells, DNA replication is highly conserved and tightly regulated. Multiple linear chromosomes must be duplicated with high fidelity before cell division, so there are many proteins that fulfill specialized roles in the replication process. Replication occurs in three phases: initiation, elongation, and termination, and ends with two complete sets of chromosomes in the nucleus.
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Many Proteins Orchestrate Replication at the Origin
Eukaryotic replication follows many of the same...
Chromatin Packaging
Each human somatic cell contains 6 billion base pairs of DNA. Each base pair is 0.34 nm long, meaning each diploid cell contains a staggering 2 meters of DNA. This long DNA strand is packed inside a nucleus measuring only 10-20 microns in diameter with the help of specialized DNA-binding proteins called histones. Together they form a compact DNA-protein complex called chromatin. The chromatin is further compacted into higher-order structures. The highest level of compaction is achieved during...

