The 'master switch gene which causes obesity has been identified, scientists have claimed. The DNA is thought to be what controls other genes found in the bodys fat cells. Researchers said the breakthrough could help treat obesity-related diseases such as heart disease and diabetes. Scientists have already identified a gene called KLF14 as being linked to type 2 diabetes and cholesterol levels, but until now they didnt know what role it played. The team of scientists analysed more than 20,000 genes in fat samples taken from under the skin of 800 female, British twins. A link was found between the KLF14 gene and the levels of distant genes found in fat tissue, showing that KLF14 acts as the controller. The findings were confirmed in 600 fat samples from a separate group of people from Iceland. DM