Clock gene per 2 daily rhythm: Correlation with the serum level of uncoupling protein 1 (UCP1) in goat and horse.

The research article discusses an investigation into the correlation between the daily rhythms of the Per2 gene and the uncoupling protein 1 (UCP1) in goats and horses, and how their relationship in these species varies from what has been found in other mammals.

Research Purpose and Methodology

• The study was designed to examine the link between the circadian rhythm of the Per2 gene and uncoupling protein 1 (UCP1) in ruminant (goats) and non-ruminant (horses) species. Per2 is a gene linked to the regulation of circadian rhythms, while UCP1 is a protein related to adaptive thermogenesis (the process by which organisms produce heat).
• The sample size was ten, made up of clinically healthy, non-pregnant, and non-lactating Maltese female goats and Italian Saddle horses. All animals were kept under natural photoperiods (consistent day and night schedules) and conditions that simulated environmental temperature and humidity.
• The researchers collected blood samples from each animal every four hours over a 48-hour period to measure Per2 gene expression and serum UCP1 concentration.

Research Findings

• Results demonstrated that levels of Per2 and UCP1 were statistically influenced by the species and time of data collection. However, they were not affected by the day of monitoring.
• The Per2 gene exhibited daily rhythmicity, which means it followed a consistent cycle. Its amplitude or level of expression varied between species; it was diurnal (active during the day) in goats and nocturnal (active during the night) in horses.
• Contrary to Per2, UCP1 did not show daily rhythmicity, meaning its presence in the blood did not follow a daily cycle of highs and lows.
• During the experimental period, a notable observation was a negative correlation between Per2 and UCP1 in horses.

Conclusion

• According to the study, the role of the Per2 gene in thermogenesis induced by beige adipocytes or type of fat cells through the activation of UCP1 did not reflect what has been found in other mammalian species. This suggests that the interaction and the nature of influence between Per2 and UCP1 might vary across different species.
• The researchers concluded by highlighting that further studies are needed to establish the correlation between these two in equids, or members of the horse family.