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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 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 1RARA generetinoic acid receptor alphaNormal FunctionThe RARA gene provides instructions for making a transcription factor called the retinoic acid receptor alpha RARa A transcription factor is a prot 1 Atopic dermatitis Description also known as atopic eczemaalso known as atopic eczema dermatitisdermatitis often disappears before adolescence. However, in some affected individuals the condition co 1 Alpers-Huttenlocher syndrome Description Alpers-Huttenlocher 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 Isolated Duane retraction syndrome Description Isolated Duane retraction syndrome is a disorder of eye movement. This condition toward the eartoward the ear toward the nosetoward the nose retractsr 1 Dupuytren contracture Description Dupuytren contracture is characterized by a deformity of the hand in which the joints of extendedextended flexedflexed supports the body's muscles, joints, organs, 1 Dyskeratosis congenita Description Dyskeratosis congenita is a disorder that can affect many parts of the body. There are three features that are characteristic of this disorder: fingernails and to 1 Terminal osseous dysplasia Description Terminal osseous dysplasia is a disorder primarily involving skeletal abnormalities and certain skin changes. It is a member of a group of related conditions 1 Early-onset isolated dystonia Description Early-onset isolated dystonia is one of many forms of dystonia, which is a group of muscle contractionsmuscle contractions tremorstremors other uncontrolle 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 FBLN5 gene fibulin 5 Normal Function The FBLN5 gene provides instructions for making a protein called fibulin-5. This protein is part of a group of proteins called fibulins. Fibulins have a varie 1 Hypertension Description Hypertension is abnormally high blood pressure in the arteries, which are the blood vessels that carry blood from the heart to the rest of the body. As the heart beats, it 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