Takahashi of the University of Texas Southwestern Medical Seth and Center D. Crosby of the Washington University College of Medicine. In their study, the researchers knocked out the clock genes in islet beta-cells in mice and discovered the animals developed impaired glucose tolerance and abnormally low levels of insulin and went on to build up diabetes. The clock of the beta-cell coordinates glucose management, and the increased loss of the clock inhibited the cells from secreting insulin. Related StoriesVaccination against type 1 diabetes may soon be available to youthful childrenHigher insulin levels linked to worse prognosis in advanced breast cancerSleep reduction reduces insulin sensitivity, raises diabetes risk’The variation we find in insulin secretion in humans and susceptibility to diabetes is probable related to this clock system,’ stated Bass, an endocrinologist been trained in molecular genetics.Jude investigators demonstrated that the protein created by the Arf gene normally blocks signals that trigger the development of pericytes. This blockage causes the network of blood vessels these cells nurture to degenerate. In the first embryo, this network, called the hyaloid vascular system, grows in to the clear, jelly-like area of the eyes called the vitreous, between the lens of the eye in the front and the retina behind the eye. The network grows through the early component of eye development, and the arteries die and the network disappears. When this network persists-as it can in the absence of Arf-it disrupts the power of the developing vision to develop to its normal size-a disease known as persistent hyperplastic primary vitreous.