Source:http://linkedlifedata.com/resource/umls/id/C0162565
MSH: 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.,NCI: A genetic metabolic disorder inherited in an autosomal dominant pattern. It is caused by a deficiency of the enzyme porphobilinogen deaminase, which is involved in heme biosynthesis. Signs and symptoms include nausea, vomiting, severe abdominal pain and distension, urinary retention, port-wine urine discoloration, hypertension, tachycardia, muscle weakness, loss of sensation, anxiety, depression, and arm, leg and back pain.