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OBJECTIVES: I. Characterize enzyme defects in patients with known or suspected porphyria and their family members.
II. Determine whether selected patients are eligible for other porphyria research protocols.
III. Provide blood, urine, and fecal samples from well characterized patients and their family members to investigators studying the nature of specific mutations in genes for heme biosynthetic pathway enzymes.
PROTOCOL OUTLINE: All patients are evaluated for porphyria type and factors contributing to the clinical expression of their particular form of the disease. Testing includes erythrocyte porphobilinogen deaminase, erythrocyte protoporphyrin, plasma porphyrins, and urinary and fecal porphyrins and precursors.
Selected patients are entered into other porphyrin research protocols in this and other institutions, including analysis of DNA to identify specific mutations in genes for heme biosynthetic pathway enzymes.
Primary Purpose: Screening
University of Texas Medical Branch
National Center for Research Resources (NCRR)
Published on BioPortfolio: 2014-08-27T03:58:18-0400
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An autosomal recessive porphyria that is due to a deficiency of UROPORPHYRINOGEN III SYNTHASE in the BONE MARROW; also known as congenital erythropoietic porphyria. This disease is characterized by SPLENOMEGALY; ANEMIA; photosensitivity; cutaneous lesions; accumulation of hydroxymethylbilane; and increased excretion of UROPORPHYRINS and COPROPORPHYRINS.
An autosomal recessive cutaneous porphyria that is due to a deficiency of UROPORPHYRINOGEN DECARBOXYLASE in both the LIVER and the BONE MARROW. Similar to PORPHYRIA CUTANEA TARDA, this disorder is caused by defects in the fifth enzyme in the 8-enzyme biosynthetic pathway of HEME, but is a homozygous enzyme deficiency with less than 10% of the normal enzyme activity. Cutaneous lesions are severe and mutilating.
An autosomal dominant porphyria that is due to a deficiency of HYDROXYMETHYLBILANE SYNTHASE in the LIVER, the third enzyme in the 8-enzyme biosynthetic pathway of HEME. Clinical features are recurrent and life-threatening neurologic disturbances, ABDOMINAL PAIN, and elevated level of AMINOLEVULINIC ACID and PORPHOBILINOGEN in the urine.
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