Clinical and molecular features of encephalomyopathy due to the A3302G mutation in the mitochondrial tRNA(Leu(UUR)) gene.
ACTA ACUST UNITED AC 2006;
62:1920-3. [PMID:
16344351 DOI:
10.1001/archneur.62.12.1920]
[Citation(s) in RCA: 11] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022]
Abstract
BACKGROUND
The mitochondrial DNA mutation A3302G in the tRNA(Leu(UUR)) gene causes respiratory chain complex I deficiency. The main clinical feature appears to be a progressive mitochondrial myopathy with proximal muscle weakness.
OBJECTIVE
To report on clinical and molecular features in 4 novel patients with the A3302G mutation.
DESIGN
Case reports.
PATIENTS
Four patients (3 of whom are from the same family) with a myopathy caused by the A3302G mitochondrial DNA mutation.
MAIN OUTCOME MEASURE
Identification of the A3302G mutation by DNA sequencing.
RESULTS
All 4 patients had an adult-onset progressive mitochondrial myopathy with proximal muscle weakness, resulting in exercise intolerance. In 2 unrelated patients, upper limb reflexes were absent with preservation of at least some lower limb reflexes. Other features including hearing loss, recurrent headaches, ptosis, progressive external ophthalmoplegia, and depression were present.
CONCLUSION
While the dominant clinical features of the A3302G mutation were exercise intolerance and proximal muscle weakness, other features of mitochondrial encephalomyopathies, previously not described for this mutation, were present.
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