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Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

The genome of most prokaryotic organisms consists of double-stranded DNA organized into one circular chromosome in a region of cytoplasm called the nucleoid. The chromosome is tightly wound, or supercoiled, for efficient storage. Prokaryotes also contain other circular pieces of DNA called plasmids. These plasmids are smaller than the chromosome and often carry genes that confer adaptive functions, such as antibiotic resistance.
Genomic Diversity in Bacteria
Although bacterial genomes are much...
Organization of Genes02:07

Organization of Genes

Overview
Genomics02:02

Genomics

Genomics is the science of genomes: it is the study of all the genetic material of an organism. In humans, the genome consists of information carried in 23 pairs of chromosomes in the nucleus, as well as mitochondrial DNA. In genomics, both coding and non-coding DNA is sequenced and analyzed. Genomics allows a better understanding of all living things, their evolution, and their diversity. It has a myriad of uses: for example, to build phylogenetic trees, to improve productivity and...
Organization of Genes02:07

Organization of Genes

Overview
Structure of a Gene01:30

Structure of a Gene

A gene is the fundamental unit of heredity. Every individual has two copies of each gene, one inherited from each parent. Although most people contain the same genes, there is a small fraction that is slightly different amongst people. A gene with a small difference in its sequence of DNA bases forms different alleles, contributing to different phenotypes.
However, only 1% of the DNA is composed of genes that encode proteins; the rest, 99% is non-coding DNA. This non-coding DNA performs...
Prokaryotic Gene Structure and Organization01:28

Prokaryotic Gene Structure and Organization

Prokaryotic genomes exhibit a streamlined organization of coding and non-coding regions essential for gene expression and protein synthesis. While coding regions contain the genetic instructions for proteins or functional RNAs, non-coding regions regulate the precise transcription and translation of these genes.Coding Regions: Proteins and RNAsThe primary coding regions, known as structural genes, include sequences transcribed into messenger RNA (mRNA) and ultimately translated into...

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配列を超えて:ゲノム機能の細胞組織

Tom Misteli1

  • 1National Cancer Institute, National Institutes of Health, Bethesda, MD 20892, USA. mistelit@mail.nih.gov

Cell
|February 27, 2007
PubMed
まとめ
この要約は機械生成です。

ゲノムは単なる線形配列ではなく,複雑な物理的構造です. 細胞核内のそれらの空間的および時間的な組織は,遺伝子発現とゲノム安定性にとって極めて重要です.

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科学分野:

  • ゲノミクスゲノミクスとは
  • 細胞生物学 細胞生物学
  • 分子生物学は分子生物学である.

背景:

  • ゲノムは,単なる線形DNA配列ではなく,細胞内の複雑な物理的構造として機能します.
  • 細胞の組織は,ゲノムの機能特性に大きく影響する.
  • ゲノム組織を理解することは,基本的な細胞のプロセスを理解するための鍵です.

研究 の 目的:

  • 空間的および時間的なゲノム組織の機能的関連性について議論する.
  • 核プロセス,クロマチン繊維,核配列の3つの階層的なレベルでのゲノム組織を探求する.
  • ゲノム機能の既存のモデルに挑戦する最近の洞察を強調する.

主な方法:

  • ゲノム組織に関する現在の文献のレビュー.
  • ゲノム構造の空間的・時間的側面の分析.
  • 細胞生物学の研究成果をゲノム学原理と統合する.

主要な成果:

  • ゲノム組織は,複数の階層レベルで発生し,細胞機能に影響を与えます.
  • 空間的および時間的なゲノム組織は,遺伝子発現とゲノム安定性に影響を与えます.
  • ゲノム組織に関する洞察に基づいた細胞の重要なプロセスのための新しいモデルが出現しています.

結論:

  • ゲノム組織は,細胞機能の決定的な決定因子です.
  • 空間的および時間的なゲノム組織は,遺伝子発現と安定性において重要な役割を果たします.
  • 最近の進歩は,ゲノム生物学とその機能的意味に関する私たちの理解を再構築しています.