کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2069113 | 1078372 | 2009 | 7 صفحه PDF | دانلود رایگان |
We report a 12-year-old patient with growth retardation, exercise intolerance, lactic acidosis (increasing after exercise) and autoimmune polyendocrinopathy type 2. Muscle biopsy shows abundant COX-negative fibers, subsarcolemmal mitochondrial aggregates and markedly reduced activities of all respiratory chain complexes. Genetic analysis identified two new cosegregating mutations in Met-tRNA (m.4415A > G) and Cox III (m.9922A > C), located in highly conserved regions of MtDNA. Both the mutations are heteroplasmics in multiple patients’ tissues. Single-muscle fiber analysis showed significantly higher levels of both the mutations in COX-negative than in normal fibers. In addition, a possible link between the mitochondrial dysfunction and the autoimmune disease is suggested.
Journal: Mitochondrion - Volume 9, Issue 2, April 2009, Pages 123–129