Preferred Label : Coenzyme q10 deficiency, primary, 1;
Symbol : COQ10D1;
CISMeF acronym : COQ10D1;
Type : Phenotype, molecular basis known;
Alternative titles and symbols : Coq10 deficiency, primary, 1; Ubiquinone deficiency 1; Coenzyme q deficiency 1; Coq deficiency 1;
Description : Primary CoQ10 deficiency is a rare, clinically heterogeneous autosomal recessive disorder
caused by mutation in any of the genes encoding proteins directly involved in the
synthesis of coenzyme Q (review by Quinzii and Hirano, 2011). Coenzyme Q10 (CoQ10),
or ubiquinone, is a mobile lipophilic electron carrier critical for electron transfer
by the mitochondrial inner membrane respiratory chain (Duncan et al., 2009). The disorder
has been associated with 5 major phenotypes, but the molecular basis has not been
determined in most patients with the disorder and there are no clear genotype/phenotype
correlations. The phenotypes include an encephalomyopathic form with seizures and
ataxia (Ogasahara et al., 1989); a multisystem infantile form with encephalopathy,
cardiomyopathy and renal failure (Rotig et al., 2000); a predominantly cerebellar
form with ataxia and cerebellar atrophy (Lamperti et al., 2003); Leigh syndrome with
growth retardation (van Maldergem et al., 2002); and an isolated myopathic form (Lalani
et al., 2005). The correct diagnosis is important because some patients may show a
favorable response to CoQ10 treatment. - Genetic Heterogeneity of Primary Coenzyme
Q10 Deficiency See also COQ10D2 (614651), caused by mutation in the PDSS1 gene (607429)
on chromosome 10p12; COQ10D3 (614652), caused by mutation in the PDSS2 gene (610564)
on chromosome 6q21; COQ10D4 (612016), caused by mutation in the COQ8 gene (ADCK3;
606980) on chromosome 1q42; COQ10D5 (614654), caused by mutation in the COQ9 gene
(612837) on chromosome 16q21; and COQ10D6 (614650), caused by mutation in the COQ6
gene (614647) on chromosome 14q24. A single patient with primary CoQ10 deficiency
associated with a de novo heterozygous 3.9-Mb deletion on chromosome 9q34 has been
reported; the deleted region included at least 80 genes, 1 of which was COQ4 (612898)
(Salviati et al., 2012). Secondary CoQ10 deficiency has been reported in association
with glutaric aciduria type IIC (MADD; 231680), caused by mutation in the;
Inheritance : Autosomal recessive;
Molecular basis : Caused by mutation in the Coenzyme Q2, polyprenyltransferase gene (COQ2, 609825.0001);
Laboratory abnormalities : Decreased activity of coenzyme Q10-dependent respiratory chain complexes; Decreased levels of coenzyme Q10 in skeletal muscle (5-35%); Increased serum creatine kinase;
Prefixed ID : #607426;
Origin ID : 607426;
UMLS CUI : C3551954;
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