TREH (Trehalase): TREH is a gene that encodes the enzyme trehalase, which is responsible for breaking down trehalose, a disaccharide sugar. Trehalase plays a crucial role in carbohydrate metabolism, particularly in the gut where trehalose is hydrolyzed. Deficiencies in trehalase activity can lead to trehalose intolerance, causing gastrointestinal symptoms after consuming trehalose.