Photic regulation of arylalkylamine N-acetyltransferasel mRNA in trout retina

Nov 30, 2000Neuroreport

Light control of a key enzyme gene in trout eye

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Abstract

AANAT1 gene expression in the trout retina varies daily, with high levels during the dark phase under light-dark cycles.

  • Melatonin production in most vertebrates is influenced by light-dark cycles and a circadian clock.
  • Rainbow trout have two AANAT genes, AANAT1 and AANAT2, with distinct expression patterns.
  • AANAT1 is exclusively expressed in the retina, while AANAT2 is found in the pineal organ and brain.
  • AANAT1 mRNA levels show daily variations in the retina, peaking during the dark phase.
  • Under constant light or darkness, AANAT1 mRNA levels do not exhibit circadian oscillation, indicating regulation by lighting conditions rather than a circadian clock.

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