Methylmalonic Acidemia
What is Methylmalonic Acidemia?
Methylmalonic acidemia is a rare inherited disorder that affects how your body breaks down certain proteins and fats. When you have this condition, your body cannot properly process specific amino acids and fatty acids. This leads to a buildup of methylmalonic acid in your blood and urine.
The condition is caused by a problem with enzymes that help convert methylmalonic acid into other substances your body can use. Without these working enzymes, methylmalonic acid accumulates to harmful levels. This can damage your brain, liver, kidneys, and other organs if not managed properly.
Most people with methylmalonic acidemia are diagnosed in infancy through newborn screening. However, milder forms may not show symptoms until later in childhood or even adulthood. Early detection and treatment are essential to prevent serious health problems and developmental delays.
Symptoms
- Poor feeding and refusal to eat in infants
- Vomiting and excessive tiredness or lethargy
- Weak muscle tone or floppiness
- Developmental delays and intellectual disability
- Failure to gain weight or grow at expected rates
- Breathing problems and rapid breathing
- Seizures or unusual movements
- Dehydration and metabolic acidosis
- Kidney problems over time
- Vision problems and eye abnormalities
Some people with milder forms may have few symptoms early in life. Symptoms often appear during periods of illness, stress, or increased protein intake. These episodes are called metabolic crises and require immediate medical attention.
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Causes and risk factors
Methylmalonic acidemia is caused by genetic mutations passed from parents to children. Most cases follow an autosomal recessive pattern, meaning both parents must carry the gene mutation for a child to develop the condition. The mutations affect genes that make enzymes needed to break down certain amino acids and odd-chain fatty acids.
In some cases, the condition results from problems with vitamin B12 metabolism rather than enzyme deficiencies. Risk factors include having parents who are carriers of the gene mutation, or parents who are related by blood. Certain ethnic groups have higher carrier rates. The condition is present from birth and cannot be prevented, but genetic counseling can help families understand their risk.
How it's diagnosed
Methylmalonic acidemia is usually diagnosed through newborn screening programs that test for elevated methylmalonic acid levels. Blood and urine tests measure methylmalonic acid and other organic acids to confirm the diagnosis. Genetic testing can identify the specific mutation causing the condition.
Rite Aid offers testing that can detect elevated methylmalonic acid levels in your blood or urine. Our panel includes methylmalonic acid testing and urine ketones, which help monitor for metabolic crises. Additional tests may measure vitamin B12 levels and amino acid profiles. A specialist will interpret results and guide treatment based on your specific enzyme deficiency.
Treatment options
- Low-protein diet to reduce methylmalonic acid production
- Avoiding fasting and eating frequent small meals
- High doses of vitamin B12 injections for responsive types
- L-carnitine supplements to help remove toxic substances
- Antibiotics to reduce gut bacteria that produce certain acids
- Emergency protocols during illness to prevent metabolic crises
- Intravenous fluids and medications during acute episodes
- Kidney transplant or liver transplant in severe cases
- Regular monitoring with blood and urine tests
- Working with a metabolic specialist and dietitian
Concerned about Methylmalonic Acidemia? Get tested at Rite Aid.
- Simple blood draw at your nearest lab
- Results in days, not weeks
- Share results with your doctor
Frequently asked questions
Methylmalonic acidemia is a rare genetic disorder that prevents your body from properly breaking down certain proteins and fats. This causes a harmful buildup of methylmalonic acid in your blood and urine. The condition can damage organs if not treated early and requires lifelong management with diet and monitoring.
Early signs in infants include poor feeding, excessive vomiting, and extreme tiredness. Babies may appear floppy with weak muscle tone and fail to gain weight. Breathing problems and dehydration can develop quickly. Most cases are caught through newborn screening before symptoms appear.
Yes, milder forms of methylmalonic acidemia may not be diagnosed until adulthood. Adults may experience fatigue, kidney problems, and episodes of metabolic crisis during illness or stress. Some people live with mild symptoms for years before diagnosis. Genetic testing and methylmalonic acid levels confirm the condition.
Most cases follow an autosomal recessive pattern, meaning both parents must carry the gene mutation. Each child of two carriers has a 25% chance of having the condition and a 50% chance of being a carrier. Genetic counseling helps families understand their risks and options for future pregnancies.
Blood and urine tests measure methylmalonic acid levels, which are significantly elevated in people with this condition. Urine ketones help monitor for metabolic crises and acute episodes. Additional testing may include vitamin B12 levels, amino acid profiles, and genetic testing to identify specific mutations.
A low-protein diet is essential, with careful limits on foods high in certain amino acids. This includes reducing meat, fish, eggs, dairy products, and legumes. A metabolic dietitian creates a personalized meal plan with special medical foods and formulas. Avoid fasting and eat frequent small meals throughout the day.
There is no cure for methylmalonic acidemia, but it can be managed with treatment. Early diagnosis and careful management help prevent complications and improve quality of life. Some people respond to vitamin B12 treatment, while others need strict dietary control. Organ transplantation may be an option in severe cases.
A metabolic crisis happens when methylmalonic acid and other toxic substances build up to dangerous levels. This can occur during illness, stress, fasting, or increased protein intake. Symptoms include severe vomiting, extreme lethargy, breathing problems, and dehydration. Metabolic crises require immediate emergency treatment to prevent organ damage.
Regular monitoring is essential, typically every three to six months when stable. Testing includes methylmalonic acid levels, kidney function, blood counts, and nutritional status. More frequent testing is needed during illness or after treatment changes. Your metabolic specialist will create a personalized monitoring schedule based on your specific needs.
Pregnancy can be challenging for women with methylmalonic acidemia due to increased protein needs and metabolic stress. Close monitoring by a high-risk pregnancy team and metabolic specialist is essential. Diet adjustments and frequent testing help maintain safe methylmalonic acid levels. Genetic counseling is recommended before pregnancy to discuss risks and options.