Porphyrias: A 2015 update

Area of Science:

• Biochemistry
• Genetics
• Metabolic Disorders

Background:

• Hereditary porphyrias are a group of eight genetic disorders impacting the heme biosynthesis pathway.
• Each disorder results from a specific enzyme deficiency, causing the accumulation of heme precursors like ALA, porphobilinogen, and porphyrins.
• Porphyrias are classified as hepatic or erythropoietic, manifesting with neurovisceral symptoms, skin lesions, or both.

Purpose of the Study:

• To summarize the classification, clinical manifestations, and diagnostic importance of hereditary porphyrias.
• To highlight the risks of severe complications, including hepatocellular carcinoma and liver failure.
• To emphasize the necessity of early diagnosis and family screening for effective management.

Main Methods:

• Review of the pathophysiology and clinical presentation of the eight hereditary porphyrias.
• Classification based on the primary organ affected (hepatic or erythropoietic).
• Discussion of diagnostic approaches involving biochemical metabolite measurements.

Main Results:

• Porphyrias present with diverse symptoms, ranging from acute neurovisceral crises to skin fragility and photosensitivity.
• Specific types like acute hepatic porphyrias and erythropoietic protoporphyria carry risks of life-threatening conditions and long-term liver damage.
• Hepatocellular carcinoma is a noted risk in certain porphyrias, with or without cirrhosis or iron overload.

Conclusions:

• Porphyrias remain underdiagnosed, underscoring the need for increased awareness and suspicion.
• Prompt biochemical diagnosis is essential for initiating timely treatment and preventing chronic hepatic complications.
• Family screening for presymptomatic carriers is crucial for disease prevention and management of long-term health risks.