PROTOCOL OUTLINE:

Patients are evaluated annually or biannually, depending on disease status and progression. Patients undergo a complete medical history, an extensive family pedigree, and a physical examination. Patients undergo general laboratory, imaging, physiologic, and clinical laboratory studies according to their disease type. Patients undergo specialized laboratory studies including plasma and leukocyte enzyme assays, quantitative urinary mucopolysaccharides and oligosaccharides, urine and plasma glycolipids, plasma and urine amino acids, urine organic acids, lymphoblastoid culture, DNA isolation from peripheral leukocytes, skin biopsy for fibroblast culture (if indicated), and medical photography. Patients also receive consultations with various specialties including ophthalmology, ENT, cardiology, pulmonary, gastroenterology/nutrition, hematology, neurology, orthopedics, rehabilitation medicine/physical therapy, and dermatology.

• Suspected diagnosis (homozygous or heterozygous) of a genetic disorder including, but not limited to, one of the following: Tay-Sachs disease (adult form) Congenital erythropoietic porphyria Galactosemia Mitochondrial myopathy Globoid cell leukodystrophy (Krabbe disease) Methylmalonic acidemia Isovaleric acidemia Morquio type A Glycogen storage disease type 1AB Ornithine aminotransferase deficiency Ceroid lipofuscinosis Glutaric aciduria type 1 Citrullinemia Other malformation syndromes, lysosomal storage disorders, or peroxisomal disorders