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Related Concept Videos

Genomic DNA in Prokaryotes00:46

Genomic DNA in Prokaryotes

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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.
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Genomic DNA in Eukaryotes00:58

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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.
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Genomics02:02

Genomics

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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...
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Comparing Mitochondrial, Chloroplast, and Prokaryotic Genomes02:16

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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...
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Genome Size and the Evolution of New Genes03:21

Genome Size and the Evolution of New Genes

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While every living organism has a genome of some kind (be it RNA, or DNA), there is considerable variation in the sizes of these blueprints. One major factor that impacts genome size is whether the organism is prokaryotic or eukaryotic. In prokaryotes, the genome contains little to no non-coding sequence, such that genes are tightly clustered in groups or operons sequentially along the chromosome. Conversely, the genes in eukaryotes are punctuated by long stretches of non-coding sequence.
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Extraction: Advanced Methods00:56

Extraction: Advanced Methods

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Metal ions can be separated from one another by complexation with organic ligands–the chelating agent– to form uncharged chelates. Here, the chelating agent must contain hydrophobic groups and behave as a weak acid, losing a proton to bind with the metal. Since most organic ligands used in this process are insoluble or undergo oxidation in the aqueous phase, the chelating agent is initially added to the organic phase and extracted into the aqueous phase. The metal-ligand complex is...
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Small-Scale Extraction of Caenorhabditis elegans Genomic DNA
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An easily-performed high-throughput method for plant genomic DNA extraction.

Deshui Yu1, Ju Zhang1, Guangxuan Tan1

  • 1Key Laboratory of Plant Genetics and Molecular Breeding, Zhoukou Normal University, Zhoukou, 466001, China; Henan Key Laboratory of Crop Molecular Breeding & Bioreactor, Zhoukou, 466001, China.

Analytical Biochemistry
|January 28, 2019
PubMed
Summary

Researchers developed a new CTAB-based genomic DNA isolation method using microcentrifuge tubes. This inexpensive, safe, and rapid protocol avoids cross-contamination and is suitable for high-throughput plant molecular biology research.

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Area of Science:

  • Plant Molecular Biology
  • Biotechnology

Background:

  • Genomic DNA isolation is essential for plant molecular biology research.
  • Existing methods often require specialized equipment like pestles, mortars, and liquid nitrogen, or expensive homogenizers, hindering high-throughput applications.
  • These conventional techniques can be time-consuming, costly, and prone to sample cross-contamination.

Purpose of the Study:

  • To develop an efficient, cost-effective, and high-throughput method for genomic DNA isolation from various plant species.
  • To provide an alternative protocol that minimizes the need for specialized equipment and hazardous materials like liquid nitrogen.
  • To ensure the developed method is safe, rapid, and prevents sample cross-contamination.

Main Methods:

  • A CTAB-based DNA extraction protocol was optimized using standard 2.0 mL microcentrifuge tubes.
  • The method was tested on a variety of plant samples to assess its applicability.
  • Key steps involved sample grinding, lysis, and purification within the microcentrifuge tube system.

Main Results:

  • The developed CTAB protocol successfully isolated genomic DNA from diverse plant types.
  • The method proved effective without the need for pestles, mortars, liquid nitrogen, or expensive homogenizers.
  • High-throughput processing was achieved, with significant reduction in cross-contamination risk.
  • The protocol demonstrated to be inexpensive, rapid, and safe for researchers.

Conclusions:

  • A novel, accessible CTAB-based DNA extraction method using microcentrifuge tubes has been established.
  • This protocol offers a practical and economical solution for high-throughput genomic DNA isolation in plant molecular biology.
  • The method's ease of use, safety, and effectiveness make it a valuable tool for researchers across various plant science disciplines.