Photoperiod differentially regulates clock genes’ expression in the suprachiasmatic nucleus of Syrian hamster

Photoperiod significantly affects the expression of clock genes in the suprachiasmatic nuclei of Syrian hamsters.

• All clock genes studied exhibit different expression patterns when exposed to long and short photoperiods.
• Under short photoperiods, Per1, Per2, Per3, and Cry2 show a shorter peak expression duration compared to long photoperiods.
• mRNA expression of Per1, Per3, and Cry1 is advanced in phase under short photoperiods relative to long photoperiods.
• Per3 demonstrates a higher amplitude peak of mRNA expression under short photoperiods, while Per1 and Per2 remain unchanged.
• Bmal1 expression is phase advanced in short photoperiods without a change in duration, and Clock expression displays rhythmicity only under short photoperiods.

AI simplified