• J Coll Physicians Surg Pak · Dec 2022

    Case Reports

    Novel Mutation of Hydroxymethylbilane Synthase in a Case of Acute Intermittent Porphyria Presenting with Posterior Reversible Encephalopathy Syndrome.

    • A Li Yang, Li Min Ma, Hong Ju Zhang, and Jie Wen Zhang.
    • Department of Neurology, Henan Provincial People's Hospital of Zhengzhou University, Zhengzhou, China.
    • J Coll Physicians Surg Pak. 2022 Dec 1; 32 (12): SS102SS104SS102-SS104.

    AbstractAcute intermittent porphyria (AIP) is an autosomal, dominant, hereditary metabolic disease caused by an inherited deficiency of hydroxymethylbilane synthase (HMBS), a crucial enzyme in the heme biosynthetic pathway. It can affect the central, peripheral, and autonomic nervous systems. We report a 23-year Chinese woman who presented with severe abdominal pain, convulsions, constipation, tachycardia, quadriparesis, and hyponatremia, accompanied by posterior reversible encephalopathy syndrome (PRES). The clinical diagnosis of AIP was made after positive urine Watson-Schwartz test for porphobilinogen (PBG). Genetic testing is important for AIP patients in confirming the diagnosis. We identified a new insertion mutation in intron 14 [c.1005dupC (p.I336Hfs*23)] of the HMBS in her genomic DNA. Timely and accurate treatment of AIP may improve disease prognosis. Key Words: Acute intermittent porphyria, Mutation, Posterior reversible encephalopathy syndrome.

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