Intrahepatic cholestasis due to mitochondrial respiratory chain complex I deficiency in a Chinese boy

WU Tong-Fei; LIU Yu-Peng; WANG Qiao; LI Xi-Yuan; MA Yan-Yan; SONG Jin-Qing; YANG Yan-Ling

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Chinese Journal of Contemporary Pediatrics ›› 2012, Vol. 14 ›› Issue (4) : 241-246.

Intrahepatic cholestasis due to mitochondrial respiratory chain complex I deficiency in a Chinese boy

WU Tong-Fei, LIU Yu-Peng, WANG Qiao, LI Xi-Yuan, MA Yan-Yan, SONG Jin-Qing, YANG Yan-Ling

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Abstract

Mitochondrial respiratory chain deficiency is a common cause of mitochondrial disease in children. This study aimed to review the clinical, enzymatic and genetic characteristics of a Chinese boy with progressive intrahepatic cholestasis due to mitochondrial respiratory chain complex I deficiency. The boy developed diarrhea from the age of 13 months, followed by progressive body weight loss, jaundice and weakness. His urine organic acids, blood amino acids and acylcarnitines profiles were normal. Mitochondrial respiratory chain complexes I to V activities in peripheral leukocytes were measured using spectrophotometric assay. Complex I activity was reduced. 5821G>A mutation was indentified by gene sequencing on tRNA-cys of mitochondrial gene in the patient and his mother. Vitamin supplements, liver protection, antibiotics and plasma infusion were not effective in the patient. Unfortunately, the boy died at the age of 17 months. Mitochondrial respiratory chain complex I deficiency is the most common mitochondrial respiratory chain disorder. This was the first case of intrahepatic cholestasis due to complex I deficiency confirmed by mitochondrial respiratory chain enzyme activity assay and gene analysis in China. It was concluded that mitochondrial hepatopathy is one of major causes of metabolic hepatopathy. Biochemical assay, mitochondrial respiratory chain complex activities assay and genetic analysis are crucial for the etiological diagnosis of metabolic hepatopathy.

Key words

Mitochondrial disease / Mitochondrial respiratory chain / Mitochondrial respiratory chain complex I deficiency / Cholestasis / Mutation / Mitochondrial hepatopathy / Child

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WU Tong-Fei, LIU Yu-Peng, WANG Qiao, LI Xi-Yuan, MA Yan-Yan, SONG Jin-Qing, YANG Yan-Ling. Intrahepatic cholestasis due to mitochondrial respiratory chain complex I deficiency in a Chinese boy[J]. Chinese Journal of Contemporary Pediatrics. 2012, 14(4): 241-246

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