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Novel mutations in a Thai patient with methylmalonic acidemia
Voraratt Champattanachai1, James R Ketudat Cairns, Vorasuk Shotelersuk
1Laboratory of Biochemistry, Chulabhorn Research Institute, Vipavadee-Rangsit Highway, Bangkok 10210, Thailand.
Molecular Genetics and Metabolism
|September 2, 2003
Summary
This study identifies two novel mutations in a Thai patient with methylmalonic acidemia (MMA). These genetic findings explain the lack of methylmalonyl-CoA mutase (MCM) activity in the patient.
Area of Science:
- Biochemistry
- Genetics
- Metabolic Disorders
Background:
- Methylmalonic acidemia (MMA) is a rare inherited metabolic disorder.
- It is characterized by the inability to properly metabolize certain fats and amino acids.
- Deficiency in methylmalonyl-CoA mutase (MCM) activity is a key feature of some MMA subtypes.
Observation:
- A Thai patient with MMA and no detectable methylmalonyl-CoA mutase (MCM) activity was studied.
- The patient presented with the mut(0) phenotype, indicating a severe deficiency in MCM function.
- Genetic analysis was performed to identify the underlying cause of the enzyme deficiency.
Findings:
- The patient was found to be heterozygous for two previously unidentified mutations in the MCM gene: 1048delT and 1706_1707delGGinsTA (G544X).
- These mutations were inherited from the patient's mother and father, respectively.
- A polymorphism, A499T, was also identified but did not impact recombinant MCM activity, suggesting it is not pathogenic.
Implications:
- These novel mutations provide new insights into the genetic basis of methylmalonic acidemia.
- Understanding these mutations can aid in the diagnosis and genetic counseling of MMA patients.
- Further research into MCM mutations can contribute to developing targeted therapies for metabolic disorders.