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Genomic DNA in Eukaryotes00:58

Genomic DNA in Eukaryotes

Eukaryotes have large genomes compared to prokaryotes. To fit their genomes into a cell, eukaryotic DNA is packaged extraordinarily tightly inside the nucleus. To achieve this, DNA is tightly wound around proteins called histones, which are packaged into nucleosomes that are joined by linker DNA and coil into chromatin fibers. Additional fibrous proteins further compact the chromatin, which is recognizable as chromosomes during certain phases of cell division.
Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes

The present-day mitochondrial and chloroplast genomes have retained some of the characteristics of their ancestral prokaryotes and also have acquired new attributes during their evolution within eukaryotic cells. Like prokaryotic genomes, mitochondrial and chloroplast genomes neither bind with histone-like proteins nor show complex packaging into chromosome-like structures, as observed in eukaryotes. Unlike mitotic cell divisions observed in eukaryotic cells, mitochondria and chloroplasts...
Export of Mitochondrial and Chloroplast Genes02:19

Export of Mitochondrial and Chloroplast Genes

A eukaryotic cell can have up to three different types of genetic systems: nuclear, mitochondrial, and chloroplast. During evolution, organelles have exported many genes to the nucleus; this transfer is still ongoing in some plant species. Approximately 18% of the Arabidopsis thaliana nuclear genome is thought to be derived from the chloroplast’s cyanobacterial ancestor, and around 75% of the yeast genome derived from the mitochondria’s bacterial ancestor. This export has occurred irrespective...
Evolutionary Relationships through Genome Comparisons02:54

Evolutionary Relationships through Genome Comparisons

Genome comparison is one of the excellent ways to interpret the evolutionary relationships between organisms. The basic principle of genome comparison is that if two species share a common feature, it is likely encoded by the DNA sequence conserved between both species. The advent of genome sequencing technologies in the late 20th century enabled scientists to understand the concept of conservation of domains between species and helped them to deduce evolutionary relationships across diverse...
Comparing Copy Number Variations and SNPs02:26

Comparing Copy Number Variations and SNPs

Sequencing of the human genome has opened up several best-kept secrets of the genome. Scientists have identified thousands of genome variations that exist within a population. These variations can be a single nucleotide or a larger chromosomal variation.
Copy number variations or CNVs are the structural variations that cover more than 1kb of DNA sequence. The single nucleotide polymorphism (SNP), on the other hand, is a single nucleotide change or a point mutation that is found in more than 1%...
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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関連する実験動画

Updated: Jul 9, 2026

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing
12:33

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing

Published on: July 28, 2017

ユカリオットの比較ゲノミクス

G M Rubin1, M D Yandell, J R Wortman

  • 1Howard Hughes Medical Institute, Department of Molecular and Cell Biology, Berkeley Drosophila Genome Project, University of California, Berkeley, CA 94720, USA.

Science (New York, N.Y.)
|March 24, 2000
PubMed
まとめ

フルーツ・フライ,ワーム,イーストのゲノム解析により,複合的な遺伝子ファミリーと,フライとワームのシグナル伝達経路が明らかになりました. フルーツハエは,ヒトと多くの遺伝子を共有し,病気の研究を支援しています.

さらに関連する動画

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

Nuclei Isolation from Mouse Cardiac Progenitor Cells for Epigenome and Gene Expression Profiling at Single-Cell Resolution
10:03

Nuclei Isolation from Mouse Cardiac Progenitor Cells for Epigenome and Gene Expression Profiling at Single-Cell Resolution

Published on: May 12, 2023

関連する実験動画

Last Updated: Jul 9, 2026

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing
12:33

Optimization and Comparative Analysis of Plant Organellar DNA Enrichment Methods Suitable for Next-generation Sequencing

Published on: July 28, 2017

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation
07:15

Determining the Likelihood of Variant Pathogenicity Using Amino Acid-level Signal-to-Noise Analysis of Genetic Variation

Published on: January 16, 2019

Nuclei Isolation from Mouse Cardiac Progenitor Cells for Epigenome and Gene Expression Profiling at Single-Cell Resolution
10:03

Nuclei Isolation from Mouse Cardiac Progenitor Cells for Epigenome and Gene Expression Profiling at Single-Cell Resolution

Published on: May 12, 2023

科学分野:

  • 比較ゲノミクスとは
  • 進化生物学の進化生物学について
  • 分子生物学は分子生物学である.

背景:

  • 基本的な生物学的プロセスを理解するには,多様な種間の比較ゲノム分析が必要です.
  • ドロソフィラ・メラノガスター (果物ハエ),カエノラブディティス・エレガンズ (虫),サッカロマイセス・セレヴィセア (酵母菌) のようなモデル生物は,保存された生物学的メカニズムと異なる生物学的メカニズムについての洞察を提供します.

研究 の 目的:

  • フルーツフライ,ワーム,酵母菌のゲノムと予測プロテオームを比較的に分析する.
  • これらの発見を細胞,発達,進化のプロセスの中で文脈化する.
  • フルーツフライの遺伝子のヒトの病気に対する関連性を評価する.

主な方法:

  • 非冗長タンパク質セットの全ゲノム比較分析.
  • 遺伝子ファミリーとタンパク質ドメインの識別と比較.
  • モデル生物とヒトの疾患遺伝子の ортоログ識別.

主要な成果:

  • フルーツフライとワームの非冗長タンパク質セットは,酵母の約2倍の大きさで,サイズも似ています.
  • 異なった遺伝子ファミリーは,フルーツフライとワームのゲノムに拡張されています.
  • フルーツ・フライやワームは,酵母よりも複雑なマルチドメインタンパク質とシグナル伝達経路を示しています.
  • フルーツ・フライは,検査した289のヒト疾患遺伝子のうち177のオートロログを持っている.

結論:

  • 比較ゲノミクスは,フルーツハエ,ワーム,酵母菌のゲノム複雑性と遺伝子ファミリー拡大の有意な違いを強調しています.
  • フルーツフライのゲノムは,共有された遺伝子のオートロロジによる人間の病気の基礎となる基本的なプロセスを研究するための貴重なモデルとして機能します.