Mitochondrial malic enzyme polymorphism among different ethnic groups in Singapore

Area of Science:

• Biochemistry
• Human Genetics
• Population Genetics

Background:

• Mitochondrial malic enzyme (EC 1.1.1.40; MEM) is a key metabolic enzyme.
• Understanding MEM genetic variation is important for population genetics and disease association studies.

Purpose of the Study:

• To investigate the genetic polymorphism of mitochondrial malic enzyme (MEM) in different ethnic groups.
• To determine the gene frequencies of MEM1 in Chinese, Indian, and Malay populations.

Main Methods:

• Starch-gel electrophoresis was used to analyze post-mortem brain samples.
• 453 unrelated individuals from Chinese, Indian, Malay, and other racial groups were studied.
• Gene frequencies and deviations from Hardy-Weinberg equilibrium were calculated.

Main Results:

• The estimated MEM1 gene frequencies were 0.7111 (Chinese), 0.6100 (Indians), and 0.6769 (Malays).
• No significant deviation from Hardy-Weinberg equilibrium was observed in Chinese and Malay populations.
• A significant deviation, characterized by a deficiency of heterozygotes, was found in the Indian population.
• Mitochondrial malic enzyme supernatant (MES) did not exhibit polymorphism.

Conclusions:

• The MEM1 gene exhibits population-specific allele frequencies.
• The observed genetic variation in the Indian population warrants further investigation.
• MEM is a potentially useful genetic marker for population studies.