ratio, through the sensor SIRT1, influences BMAL1
and CLOCK in both central and peripheral clocks.
Schibler and colleagues report similar results in the same issue of Cell, demonstrating that SIRT1 levels rise and fall throughout the day, and that SIRT1, CLOCK and BMAL1
interact in a circadian manner.
Disruption of the clock components CLOCK and BMAL1 leads to hypoinsulinaemia and diabetes.
BMAL1 and CLOCK, two essential components of the circadian clock, are involved in glucose homeostasis.
This and other findings suggested that the REV-ERBs, act as a break on the genes BMAL1
Brain, muscle ARNT-like protein 1 (Bmall) siRNA and Mr or Bmall expression plasmids were used to analyze the effect of BMAL1
on PPAR-a expression in c7 cells.
In the new study, Sassone-Corsi's group shows that SIRT1 indeed acts as tick to CLOCK's tock, removing an acetyl group from histones and also from CLOCK's partner, BMAL1
acute exposure) increases BMAL1
expression in these cells (Ando et al.
Scientists knew that two genes, CLOCK and BMAL1
, served as the key drivers for raising PER protein levels.
Some of the genes known to be involved in these loops include CLOCK, BMAL1
, and PER1 and PER2.
also codes for a transcription factor that works together with the CLOCK protein.