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Related Concept Videos

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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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Oxygen delivery is critical in clinical care, especially for patients with respiratory disorders or those undergoing surgical procedures. Various systems, such as tracheostomy and the T-piece, deliver oxygen to the lungs, ensuring adequate arterial oxygenation.
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Protons and neutrons, collectively called nucleons, are packed together tightly in a nucleus. With a radius of about 10−15 meters, a nucleus is quite small compared to the radius of the entire atom, which is about 10−10 meters. Nuclei are extremely dense compared to bulk matter, averaging 1.8 × 1014 grams per cubic centimeter. If the earth’s density were equal to the average nuclear density, the earth’s radius would be only about 200 meters.
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Intact DNA strands can be found in fossils, while scientists sometimes struggle to keep RNA intact under laboratory conditions. The structural variations between RNA and DNA underlie the differences in their stability and longevity. Because DNA is double-stranded, it is inherently more stable. The single-stranded structure of RNA is less stable but also more flexible and can form weak internal bonds. Additionally, most RNAs in the cell are relatively short, while DNA can be up to 250 million...
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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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Stability01:28

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The time response of a linear time-invariant (LTI) system can be divided into transient and steady-state responses. The transient response represents the system's initial reaction to a change in input and diminishes to zero over time. In contrast, the steady-state response is the behavior that persists after the transient effects have faded.
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An Alternative Culture Method to Maintain Genomic Hypomethylation of Mouse Embryonic Stem Cells Using MEK Inhibitor PD0325901 and Vitamin C
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Piecing Together How Peroxiredoxins Maintain Genomic Stability.

James D West1, Trevor J Roston2, Joseph B David3

  • 1Biochemistry & Molecular Biology Program, Departments of Biology and Chemistry, The College of Wooster, Wooster, OH 44691, USA. jwest@wooster.edu.

Antioxidants (Basel, Switzerland)
|November 30, 2018
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Summary

Peroxiredoxins like Tsa1 protect against oxidative stress and maintain genomic stability. This study explores how Tsa1 reduces mutation rates, linking its functions to cancer prevention.

Keywords:
genomic instabilitymutatoroxidative stressperoxiredoxinredox switchribonucleotide reductasesulfiredoxinthiol peroxidasethioredoxin

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Genetics

Background:

  • Peroxiredoxins (Prx) are conserved thiol oxidoreductases crucial for detoxifying oxidants and protecting against oxidative stress.
  • Beyond antioxidant roles, some Prx exhibit molecular chaperone and redox signaling (redox switch) activities.
  • Loss of Prdx1 in mice and Tsa1 in yeast correlates with increased tumor incidence and mutation rates, respectively, suggesting a link to genome stability and cancer.

Purpose of the Study:

  • To investigate the mechanisms by which the peroxiredoxin Tsa1 reduces mutation rates in *Saccharomyces cerevisiae*.
  • To elucidate the interplay between Tsa1's diverse biochemical functions and its influence on genome stability.
  • To explore the potential conserved role of peroxiredoxins in maintaining genomic integrity across species.

Main Methods:

  • Analysis of Tsa1's biochemical activities, including peroxidase, molecular chaperone, and redox switch functions.
  • Investigating Tsa1's interactions with the thioredoxin system and its substrates, such as ribonucleotide reductase.
  • Assessing the impact of Tsa1 deficiency on mutation rates and genomic stability in yeast models.

Main Results:

  • Tsa1's multifaceted roles in oxidant defense, protein homeostasis, and redox signaling contribute to lowering mutation rates.
  • Evidence suggests Tsa1 influences genome stability through its interactions within the thioredoxin pathway.
  • Findings highlight Tsa1's critical function in maintaining genetic integrity in yeast.

Conclusions:

  • Tsa1 plays a significant role in preventing mutations, thereby contributing to genome stability.
  • The mechanisms by which Tsa1 maintains genome stability involve its diverse biochemical activities and interactions with the thioredoxin system.
  • Further research is needed to fully understand these mechanisms and their conservation across different species in relation to cancer etiology.