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A Caucasian family with the 3271 mutation in mitochondrial DNA
S K Marie1, Y Goto, M R Passos-Bueno
1Department of Neurology, Faculty of Medicine, University of Sao Paulo, Brazil.
Abstract:
The second most common mutation associated with MELAS (mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes) in Japan is the 3271 mutation. This mutation was found in a Brazilian family of Portuguese and Italian descent, indicating that this mutation also exists in a race other than Japanese. The propositus had mild clinical manifestations atypical of MELAS, suggesting that patients with the 3271 mutation exhibit heterogeneous phenotypic expression as seen in the 3243 mutation.
Insights
The mitochondrial 3271 mutation, common in Japan, was identified in a Brazilian family. This suggests broader ethnic prevalence and varied symptoms in MELAS patients with this mutation.
Area of Science:
- Genetics
- Neurology
- Mitochondrial Diseases
Background:
- Mitochondrial myopathy, encephalopathy, lactic acidosis, and stroke-like episodes (MELAS) is a significant mitochondrial disorder.
- The MELAS 3271 mutation is the second most prevalent in Japan.
Observation:
- The MELAS 3271 mutation was detected in a Brazilian family with Portuguese and Italian ancestry.
- This finding expands the known ethnic distribution of the 3271 mutation beyond Japanese populations.
Findings:
- The propositus presented with mild, atypical clinical manifestations of MELAS.
- This indicates that the 3271 mutation can lead to diverse phenotypic expressions.
Implications:
- The 3271 mutation may be present in diverse ethnic groups, not exclusively Japanese.
- Phenotypic heterogeneity in MELAS patients with the 3271 mutation mirrors that observed with the 3243 mutation, requiring broader diagnostic considerations.