[Gene mutation analysis in patients with propionic acidemia].

Area of Science:

• Biochemistry
• Genetics
• Metabolic Disorders

Background:

• Propionic acidemia (PA) is an inherited metabolic disorder resulting from propionyl-CoA carboxylase (PCC) deficiency.
• PCC is a crucial enzyme composed of alpha-PCC and beta-PCC subunits, encoded by PCCA and PCCB genes, respectively.
• Mutations in PCCA or PCCB lead to PA, impacting the urea cycle and amino acid metabolism.

Purpose of the Study:

• To investigate the mutation spectrum of PCCA and PCCB genes in Chinese patients with propionic acidemia.
• To identify novel mutations associated with PA in this population.

Main Methods:

• Genomic DNA was extracted from peripheral blood leukocytes of 11 unrelated Chinese PA patients.
• Polymerase chain reaction (PCR) amplification and direct sequencing were used to analyze all 39 exons of the PCCA and PCCB genes.
• Sequencing was performed using an ABI 3700 Automated DNA Sequencer.

Main Results:

• Thirteen distinct mutations were identified across the PCCA and PCCB genes in the 11 patients.
• Ten of these mutations were novel, while three were previously reported.
• Specific mutations included missense, splicing, deletion, and insertion-deletion types in both alpha-PCC and beta-PCC subunits.

Conclusions:

• The study identified a total of 13 mutations in 11 Chinese PA patients, with 10 being novel.
• No single mutation was found to be predominant in the Chinese PCCA and PCCB deficient patient cohort.
• Genetic analysis reveals a diverse range of mutations contributing to propionic acidemia in China.