関連する実験動画
Updated: May 13, 2026

10:10
Observing Mitotic Division and Dynamics in a Live Zebrafish Embryo
Published on: July 15, 2016
境界要素関連因子BEAF-32を用いた染色体領域の視覚化
K Zhao1, C M Hart, U K Laemmli
1Department of Biochemistry, University of Geneva, Switzerland.
Cell
|June 16, 1995
まとめ
研究者は,Drosophila.のscsの境界要素と結合する新しいタンパク質であるBEAF-32を特定しました. このタンパク質は染色体ドメインの組織とエンハンサー阻害活性に不可欠であり,染色体構造の役割を示唆しています.
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
- クロマチンの生物学
背景:
- ドロソフィラのhsp70ロカスには,scsの境界要素,ドメインの隔離に不可欠な規制領域が含まれています.
- 境界要素の機能と結合し仲介する要因を理解することは,ゲノム組織を理解する鍵です.
研究 の 目的:
- SCSの境界要素に結合するタンパク質を特定し,特徴づけること.
- これらのタンパク質がエンハンサー阻害と染色体ドメイン構造における役割を調査する.
主な方法:
- ドロソフィラからタンパク質を浄化する.
- cDNAクローニングとシーケンシング.
- In vivo結合測定法. インビヴォ結合測定法.
- ポリテン染色体の免疫染色.
- 増強剤を阻害するアッセイ.
主要な成果:
- scs'要素に結合する2つのタンパク質を精製し,1つはBEAF-32 (境界要素関連因子32 kDa) として識別されました.
- BEAF-32は,scs'に結合するが,scs in vivoには結合しない.
- 免疫ステーリングは,ポリテネ染色体におけるインターバンドとパフ境界へのBEAF-32の局所化を明らかにした.
- BEAF-32のパリンドロミック結合部位は境界機能に関与しているが,一時的に感染した細胞における増強剤阻害アッセイは陰性であり,クロマチンの関与を示唆している.
結論:
- BEAF-32は新しいタンパク質で,scsの境界要素と結合し,インターバンドとパフ境界に局限しています.
- SCSの結合部位は境界機能に作用し,おそらくBEAF-32.2によって媒介される.
- クロマチンおよび/または核構造は,scsの境界要素の強化剤阻害活性に関与している可能性が高い.
関連する概念動画
Chromosome Structure
A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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...
Forces Acting on Chromosomes
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...
Chromosome Structure
A functional eukaryotic chromosome must contain three elements: a centromere, telomeres, and numerous origins of replication.
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
The centromere is a DNA sequence that links sister chromatids. This is also where kinetochores, protein complexes to which spindle microtubules attach, are constructed after the chromosome is replicated. The kinetochores allow the spindle microtubules to move the chromosomes within the cell during cell division.
Telomeres consist of non-coding repetitive nucleotide...
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...
Forces Acting on Chromosomes
During mitosis, chromosome movements occur through the interplay of multiple piconewton level forces. In prometaphase, these forces help in chromosome assembly or congression at the equatorial plane, eventually leading to their alignment at the metaphase plate. The forces acting on the chromosomes are space and time-dependent; therefore, they vary with the position of the chromosomes as the cell progresses through mitosis.
Microtubules and motor proteins exert two types of forces on...
Microtubules and motor proteins exert two types of forces on...

