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Overview of DNA Repair02:25

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In order to be passed through generations, genomic DNA must be undamaged and error-free. However, every day, DNA in a cell undergoes several thousand to a million damaging events by natural causes and external factors. Ionizing radiation such as UV rays, free radicals produced during cellular respiration, and hydrolytic damage from metabolic reactions can alter the structure of DNA. Damages caused include single-base alteration, base dimerization, chain breaks, and cross-linkage.
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One of the common DNA damages is the chemical alteration of single bases by alkylation, oxidation, or deamination. The altered bases cause mispairing and strand breakage during replication. This type of damage causes minimal change to the DNA double helix structure and can be repaired by the base excision repair (BER) pathways. BER corrects damaged DNA sequences by removing the damaged base and restoring the original base sequence using the complementary strand as a template.
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Organisms are capable of detecting and fixing nucleotide mismatches that occur during DNA replication. This sophisticated process requires identifying the new strand and replacing the erroneous bases with correct nucleotides. Mismatch repair is coordinated by many proteins in both prokaryotes and eukaryotes.
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Imaging Mismatch Repair and Cellular Responses to DNA Damage in Bacillus subtilis
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Pteropods counter mechanical damage and dissolution through extensive shell repair.

Victoria L Peck1, Rosie L Oakes2,3, Elizabeth M Harper4

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Area of Science:

  • Marine Biology
  • Oceanography
  • Ecology

Background:

  • Ocean acidification poses a threat to marine calcifying organisms, particularly pteropods, due to shell dissolution.
  • The periostracum, an organic shell coating, may offer protection against dissolution, challenging previous assumptions about pteropod vulnerability.

Purpose of the Study:

  • To investigate the shell integrity and repair mechanisms of the polar pteropod Limacina helicina under ocean acidification conditions.
  • To assess the resilience of pteropods to shell damage and dissolution using advanced imaging technology.

Main Methods:

  • Utilized micro-computed tomography (micro-CT) technology to analyze shell structure and damage in Limacina helicina specimens.
  • Examined shell thickness and repair material in pteropods collected from the Fram Strait.

Main Results:

  • Pteropod shells, despite localized dissolution and damage, maintained structural integrity through the thickening of the inner shell wall.
  • One specimen exhibited a four-fold increase in shell thickness due to repair material, indicating significant regenerative capacity.
  • Observed evidence of both mechanical and dissolution-induced damage in the studied specimens.

Conclusions:

  • Pteropods demonstrate remarkable resilience to ocean acidification through active shell repair and maintenance.
  • The ability to repair shells suggests a greater capacity to withstand changing ocean conditions than previously assumed.
  • Shell repair likely incurs a metabolic cost, which could impact pteropod populations and the broader marine ecosystem.