Pyridoxamine-5-phosphate deficiency-developmental and epileptic encephalopathy

Pyridoxamine-5-phosphate oxidase deficiency (also called PNPO deficiency or PMP oxidase deficiency) is a very rare inherited brain disorder that affects how the body processes vitamin B6. The body needs a specific form of vitamin B6 called pyridoxal-5-phosphate (PLP) to keep the brain working properly. In this condition, a faulty gene means the body cannot make enough PLP, which causes the brain to become starved of a critical chemical it needs to function. This leads to a type of severe brain disorder called a developmental and epileptic encephalopathy. The most striking feature of this disease is seizures that begin very early in life, often within hours or days of birth. These seizures are usually very hard to control with standard anti-seizure medicines. Babies may also show signs of brain distress before birth, such as abnormal movements in the womb. Without early treatment, the ongoing seizures cause serious damage to the developing brain, leading to intellectual disability and developmental delays. The good news is that this condition can be treated with vitamin B6 supplements, specifically pyridoxal-5-phosphate (PLP) or sometimes pyridoxine. Starting treatment as early as possible is critical to protecting the brain and improving outcomes. Children who are diagnosed and treated quickly have a better chance of reaching developmental milestones, though many still face ongoing challenges.

Data sourced from FDA regulatory filings and ClinicalTrials.gov. Updated periodically.

Bring these to your next appointment

• Q1.What is the best form and dose of vitamin B6 for my child, and how will we know if it is working?,How quickly should we expect seizures to improve after starting PLP treatment, and what should we do if they do not?,Should we do genetic testing on other family members, and what are the chances of this happening in a future pregnancy?,What therapies (physical, speech, occupational) should my child start, and how soon?,Are there any signs of vitamin B6 toxicity I should watch for at home?,Does my child need an emergency seizure rescue plan, and what medicines should we have at home?,Is there a newborn screening test available so future siblings could be diagnosed earlier?

Common questions about Pyridoxamine-5-phosphate deficiency-developmental and epileptic encephalopathy

Related conditions

Other rare diseases commonly researched alongside Pyridoxamine-5-phosphate deficiency-developmental and epileptic encephalopathy.

• Folinic acid-responsive seizures→