In the human body, there's a tiny structure that houses a huge amount of information: it's - the human gene. A gene is a length of DNA and helps to shape much of who we are. So, if something should go wrong with one of these smallest of elements, a giant-sized problem can result. And that's the case in the genetic mutation that causes a condition known as tuberous sclerosis, or TS. As you'll see in this episode Tuberous Sclerosis is a mysterious disease that causes lesions or tumors that can invade major organs. And though TS tumors are typically benign, they can bring on alarming consequences such as learning disorders, seizures, even autism.