Margarida Maia, PhD, science writer —

Certain triggers of acute intermittent porphyria (AIP) may also affect the function of the brain’s mitochondria — the bean-shaped structures that produce energy inside cells — according to a mouse study conducted by researchers in Argentina. While it is unknown whether this holds true in humans, understanding “the mechanisms…

Acute intermittent porphyria (AIP) manifests in a variety of ways, but in China, the most common symptoms are abdominal pain and problems resulting from damage to the brain and spinal cord, a review study has found. Nearly all Chinese patients with AIP — about 95% — experienced abdominal pain,…

Treatment with cimetidine, an over-the-counter (OTC) medication normally used to treat heartburn, may help children with erythropoietic protoporphyria (EPP) build tolerance to sunlight — and this may translate into better quality of life — according to reports of EPP cases in Italy. “Based on the literature and our clinical…

A rarely reported mutation in the HMBS gene was identified as the cause of recurrent, hard-to-treat episodes of acute intermittent porphyria (AIP) in a young Mexican woman, according to a case report. While it’s unclear whether the mutation is linked to a more severe clinical presentation, its identification “underscores…

Different mutations in the HMBS gene — the cause of acute intermittent porphyria (AIP) — are not associated with distinct activity levels of the resulting enzyme but generally reduce its levels by about half, a review study has found. About 90% of AIP patients have reduced activity levels of…

A new mutation in the HMBS gene was identified as the cause of acute intermittent porphyria (AIP) in a woman, and also detected in her daughter, who showed no symptoms of the disease, according to a study in China. The mutation was found to affect splicing — the process…

People with acute intermittent porphyria (AIP) who have high levels of porphyrin precursors in the urine are more likely to develop primary liver cancer, according to a new study that also found the risks are higher for these AIP patients after age 65. “Individualized PLC [primary liver cancer] risk…

Many of the symptoms of erythropoietic protoporphyria (EPP), a form of porphyria, may not be reported fully or at all, and this may make it harder to diagnose the rare disease, according to a new U.S. study. Researchers observed that nearly all patients in the…

Many people with acute hepatic porphyria (AHP) in Japan already have complications related to their disease at the time they’re diagnosed and about one in 10 take medications that could make their attacks worse, a study has found. Researchers observed that while a little more than half the patients received…

A boy in Iran was found to carry two copies of a previously unknown mutation in the PPOX gene that caused both skin and neurological symptoms of variegate porphyria (VP), according to a recent case report. “To the best of our knowledge, around 15 cases with homozygous VP [both…