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Journal of Pediatrics 1994-Jan

Mitochondrial DNA rearrangements with onset as chronic diarrhea with villous atrophy.

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Krækjan er vistuð á klemmuspjaldið
V Cormier-Daire
J P Bonnefont
P Rustin
C Maurage
H Ogler
J Schmitz
C Ricour
J M Saudubray
A Munnich
A Rötig

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Útdráttur

We report two unrelated children with onset of chronic diarrhea and villous atrophy in the first years of life. Elevated plasma lactate concentrations and lactate/pyruvate and ketone body molar ratios suggested a genetic defect of oxidative phosphorylation. Analysis of the mitochondrial respiratory chain showed a complex III deficiency in muscle of both patients. Southern blot analysis provided evidence of heteroplasmic mitochondrial DNA rearrangements that involve deletion and deletion-duplication. Directly repeated sequences (10 and 11 base pairs, respectively) were present in the wild type of mitochondrial genome at the boundaries of the deletion. Neither parent of either patient had rearranged molecules in their circulating lymphocytes. It appears that a mitochondrial disorder can have chronic diarrhea and villous atrophy as the initial clinical feature. On the basis of these observations, we suggest that genetic defects of mitochondrial energy supply be considered in elucidating the origin of unexplained chronic diarrheas, especially when other, unrelated symptoms occur in the course of the disease.

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