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1 AlpersHuttenlocher syndrome Description AlpersHuttenlocher syndrome is one of the most severe of a group of conditions called the POLG related disorders The conditions in this group feature a. 1 How Genes Work 1 What are proteins and what do they do? Proteins are large, complex molecules that play many critical roles in the body. They do most of the work in cells and are required for t 1PIGA genephosphatidylinositol glycan anchor biosynthesis class ANormal FunctionThe PIGA gene provides instructions for making a protein called phosphatidylinositol glycan class A This protein takes p 1MelanomaDescriptionMelanoma is a type of skin cancer that begins in pigment-producing cells called melanocytes This cancer typically occurs in areas that are only occasionally sun-exposed tumors are 1 Psoriatic arthritis Description arthritisarthritis in combination with a skin disorder called psoriasis. Psoriasis is a chronic inflammatory condition characterized by patches of red, irritated ski 1 ANTXR2 gene ANTXR cell adhesion molecule 2 Normal Function The ANTXR2 gene provides instructions for making a protein that is found at the surface of many types of cells. The ANTXR2 protein is be 1 Dermatofibrosarcoma protuberans Description Dermatofibrosarcoma protuberans is a rare type of cancer that causes a tumor in the deep layers of skin. This condition is a type of soft tissue sarcoma, 1 ADAMTS2 gene ADAM metallopeptidase with thrombospondin type 1 motif 2 Normal Function The ADAMTS2 gene provides instructions for making an enzyme that processes several types of procollagen molec 1 Ellis-van Creveld syndrome Description Ellis-van Creveld syndrome is an inherited disorder of bone growth that results in very dwarfismdwarfism lower legs and a narrow chest with short ribs. Ellis- 1 Childhood absence epilepsy Description epilepsyepilepsy . This condition begins in childhood, usually between ages 3 and 8. Affected children also known as petit mal seizuresalso known as petit mal 1 Sandhoff disease Description Sandhoff disease is a rare inherited disorder that progressively destroys nerve cells ( central nervous systemcentral nervous system classified into three major types ba 1 Pantothenate kinase-associated neurodegeneration Description Pantothenate kinase-associated neurodegeneration (formerly called Hallervorden-Spatz syndrome) is a disorder of the nervous system. This 1 Stickler syndrome Description Stickler syndrome is a group of hereditary conditions characterized by a distinctive facial appearance, eye abnormalities, hearing loss, and joint problems. These sign 1 Nail-patella syndrome Description Nail-patella syndrome is characterized by abnormalities of the nails, knees, elbows, and pelvis. The features of nail-patella syndrome vary in severity between aff 1 Y chromosome infertility Description Y chromosome infertility is a condition that affects the production of sperm and causes male infertility, which means it is difficult or impossible for affected