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2016 ; 6
(ä): 36313
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English Wikipedia
Identification of G8969 A in mitochondrial ATP6 gene that severely compromises
ATP synthase function in a patient with IgA nephropathy
#MMPMID27812026
Wen S
; Niedzwiecka K
; Zhao W
; Xu S
; Liang S
; Zhu X
; Xie H
; Tribouillard-Tanvier D
; Giraud MF
; Zeng C
; Dautant A
; Kucharczyk R
; Liu Z
; di Rago JP
; Chen H
Sci Rep
2016[Nov]; 6
(ä): 36313
PMID27812026
show ga
Here we elucidated the pathogenesis of a 14-year-old Chinese female who initially
developed an isolated nephropathy followed by a complex clinical presentation
with brain and muscle problems, which indicated that the disease process was
possibly due to a mitochondrial dysfunction. Careful evaluation of renal biopsy
samples revealed a decreased staining of cells induced by COX and NADH
dehydrogenase activities, and a strong fragmentation of the mitochondrial
network. These anomalies were due to the presence of a mutation in the
mitochondrial ATP6 gene, G8969>A. This mutation leads to replacement of a highly
conserved serine residue at position 148 of the a-subunit of ATP synthase.
Increasing the mutation load in cybrid cell lines was paralleled by the
appearance of abnormal mitochondrial morphologies, diminished respiration and
enhanced production of reactive oxygen species. An equivalent of the G8969>A
mutation in yeast had dramatic consequences on ATP synthase, with a block in
proton translocation. The mutation was particularly abundant (89%) in the kidney
compared to blood and urine, which is likely the reason why this organ was
affected first. Based on these findings, we suggest that nephrologists should pay
more attention to the possibility of a mitochondrial dysfunction when evaluating
patients suffering from kidney problems.