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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

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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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DNA-only transposons are called autonomous transposons since they code for the enzyme transposase that is required for the transposition mechanism. Insertion of transposons can alter gene functions in multiple ways. They can mutate the gene, alter gene expression by introducing a novel promoter or insulator sequence, introduce new splice sites, and change the mRNA transcripts produced, or remodel chromatin structure.
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G-quadruplex structures are stable and detectable in human genomic DNA.

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G-quadruplex structures, important for genome stability, are confirmed to exist in human DNA. This study maps their locations and shows they can influence gene transcription.

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Area of Science:

  • Genomics
  • Molecular Biology
  • Biochemistry

Background:

  • G-quadruplexes are non-canonical DNA structures with potential roles in key genomic processes.
  • Their precise distribution and existence within double-stranded genomic DNA remain largely uncharacterized.

Purpose of the Study:

  • To investigate the presence and genomic location of G-quadruplex structures in human DNA.
  • To determine if G-quadruplexes can be mapped and if they influence gene expression.

Main Methods:

  • Utilized a G-quadruplex-specific antibody for enrichment of DNA structures.
  • Employed deep sequencing for high-resolution mapping of G-quadruplexes in human breast adenocarcinoma cell DNA.
  • Tested the effect of G-quadruplex-stabilizing ligands on target gene transcription.

Main Results:

  • Successfully identified and mapped G-quadruplex structures in human genomic DNA.
  • Found stable G-quadruplexes in sub-telomeres, gene bodies, and regulatory regions.
  • Demonstrated that G-quadruplex-stabilizing ligands can modulate the transcription of specific genes.

Conclusions:

  • Confirmed the existence and persistence of G-quadruplex structures in human genomic DNA.
  • Established a method for high-resolution mapping of G-quadruplexes.
  • Provided evidence for the functional role of G-quadruplexes in transcriptional regulation.