This gene, the clock gene, plays a role in controlling the biological timetable of human DNA.
20 17 the winner of the nobel prize in physiology or medicine isolated the gene (PER gene) that controls the biological circadian rhythm (biological clock) from the genome of Drosophila. Studies have shown that the PER protein encoded by this gene accumulates in the nucleus at night and degrades in the morning. When PER protein accumulates to a certain amount, it will inhibit the expression of PER gene, resulting in the inability to synthesize PER protein, so animals gradually enter a state of sleep. The biological clock also affects other multicellular organisms (including humans) through this mechanism.