MODY – Maturity Onset Diabetes of the Young – is a rare form of diabetes (3% of those diagnosed under the age of 30). MODY is caused by a change in a single gene. This means there is a 1 in 2 chance of inheriting MODY from an affected parent and it runs in families. The most common genes that cause MODY are HNF1A, HNF4A, HNF1B and glucokinase. The condition presents differently depending on which gene is affected. It is important to know which gene is causing MODY, as treatment varies accordingly. Some forms of MODY may require insulin injections, while others are treated using drugs to boost insulin production in the pancreas. One form of MODY requires no treatment at all. MODY is typically diagnosed under the age of 25, often with a family history of diabetes.