Leigh syndrome with nephropathy and CoQ10 deficiency due to decaprenyl diphosphate synthase subunit 2 (PDSS2) mutations.
Coenzyme Q(10) (CoQ(10)) is a vital lipophilic molecule that transfers electrons from mitochondrial respiratory chain complexes I and II to complex III. Deficiency of CoQ(10) has been associated with diverse clinical phenotypes, but, in most patients, the molecular cause is unknown. The first defect in a CoQ(10) biosynthetic gene, COQ2, was identified in a child with encephalomyopathy and nephrotic syndrome and in a younger sibling with only nephropathy. Here, we describe an infant with severe Leigh syndrome, nephrotic syndrome, and CoQ(10) deficiency in muscle and fibroblasts and compound heterozygous mutations in the PDSS2 gene, which encodes a subunit of decaprenyl diphosphate synthase, the first enzyme of the CoQ(10) biosynthetic pathway. Biochemical assays with radiolabeled substrates indicated a severe defect in decaprenyl diphosphate synthase in the patient's fibroblasts. This is the first description of pathogenic mutations in PDSS2 and confirms the molecular and clinical heterogeneity of primary CoQ(10) deficiency.
López
Luis Carlos
LC
Department of Neurology, Columbia University College of Physicians and Surgeons, New York, NY 10032, USA.
Schuelke
Markus
M
Quinzii
Catarina M
CM
Kanki
Tomotake
T
Rodenburg
Richard J T
RJ
Naini
Ali
A
Dimauro
Salvatore
S
Hirano
Michio
M
D019883:Alkyl and Aryl Transferases / Q000235:genetics* / Q000378:metabolism; D001710:Biotin / Q000627:therapeutic use; D002331:Carnitine / Q000627:therapeutic use; D016022:Case-Control Studies; D002478:Cells, Cultured; D003067:Coenzymes; D005347:Fibroblasts / Q000378:metabolism; D006801:Humans; D007223:Infant; D007674:Kidney Diseases / Q000188:drug therapy / Q000209:etiology / Q000235:genetics*; D007888:Leigh Disease / Q000150:complications / Q000188:drug therapy / Q000235:genetics*; D009123:Muscle Hypotonia / Q000235:genetics; D009154:Mutation; D021122:Protein Subunits; D012256:Riboflavin / Q000627:therapeutic use; D013831:Thiamine / Q000627:therapeutic use; D014451:Ubiquinone / Q000031:analogs & derivatives* / Q000096:biosynthesis / Q000172:deficiency
D003067:Coenzymes; D021122:Protein Subunits; D014451:Ubiquinone; D001710:Biotin; D019883:Alkyl and Aryl Transferases; C039821:decaprenyl pyrophosphate synthetase; C024989:coenzyme Q10; D002331:Carnitine; D012256:Riboflavin; D013831:Thiamine