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Season-dependent effects of photoperiod and temperature on circadian rhythm of arylalkylamine N-acetyltransferase2 gene expression in pineal organ of an air-breathing catfish, Clarias gariepinus
Seasonal effects of day length and temperature on daily patterns of a key sleep-related gene in the pineal gland of air-breathing catfish
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Abstract
Aanat2 gene expression in the pineal organ of Clarias gariepinus shows a prominent circadian rhythm regardless of photoperiods and temperatures.
- The study measured aanat2 mRNA levels using Real-Time PCR.
- Circadian rhythm of aanat2 gene expression is influenced by different lighting regimes and temperatures in a seasonal manner.
- Pineal organs maintained in vitro exhibited a circadian rhythm under both 12L-12D and continuous dark (DD) conditions.
- A free-running rhythm of aanat2 expression was observed in pineal organs under constant light (LL) and DD conditions.
- Findings suggest the presence of an endogenous circadian oscillator in the fish pineal organ that is entrained by light-dark cycles.
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