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Ascorbate synthesis in fishes: A review.

Biyun Ching1, Shit F Chew, Yuen K Ip

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African lungfish brains can synthesize the essential nutrient ascorbate (vitamin C). This study reviews ascorbate synthesis in fish, highlighting this unusual brain-based production pathway.

Keywords:
Ascorbic aciddehydroascorbategulonolactone oxidaseoxidative stressvitamin C

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Area of Science:

  • Biochemistry
  • Comparative Physiology
  • Neuroscience

Background:

  • Ascorbate (vitamin C) biosynthesis is primarily known in vertebrate liver and kidney.
  • The enzyme l-gulono-γ-lactone oxidase is critical for ascorbate synthesis.
  • Previous research has not extensively explored ascorbate synthesis in fish brains.

Purpose of the Study:

  • To review current knowledge of ascorbate biosynthesis in fish.
  • To discuss the implications of discovering ascorbate synthesis in the African lungfish brain.
  • To propose future research directions for ascorbate synthesis in fish.

Main Methods:

  • Literature review of studies on ascorbate synthesis in vertebrates and fish.
  • Analysis of a recent study reporting l-gulono-γ-lactone oxidase expression in Protopterus annectens brain.
  • Comparative analysis of ascorbate synthesis pathways across different fish species.

Main Results:

  • The enzyme l-gulono-γ-lactone oxidase, essential for ascorbate production, has been identified in the brain of the African lungfish (Protopterus annectens).
  • This finding suggests a potential site for ascorbate biosynthesis within the central nervous system of this species.
  • Existing literature confirms ascorbate synthesis in fish liver/kidney but highlights the novelty of brain-based synthesis.

Conclusions:

  • The discovery of ascorbate biosynthesis in the African lungfish brain represents an unusual and significant finding in vertebrate biochemistry.
  • Further research is warranted to elucidate the functional role and regulation of brain-based ascorbate synthesis in fish.
  • Understanding this pathway could offer new insights into neuroprotection and metabolic adaptations in aquatic vertebrates.