Mitochondrial disease is phenotypically and genetically heterogeneous with an estimated prevalence of 1 in 4,300. Mutations in the POLG gene, encoding the catalytic subunit of DNA polymerase gamma, are an important cause of mitochondrial disease. The spectrum of clinical manifestations in POLG-related mitochondrial disease is variable, with disease onset ranging from adulthood-onset dominant or...

Polymerase gamma is a mitochondrial DNA polymerase, that responsible for the replication of (mtDNA). It encoded by POLG gene, on chromosome 15q25. Various mutations in this gene have been described, with varied phenotypic manifestations. The triad sensory ataxic neuropathy, dysarthria, and ophthalmoparesis (SANDO) has reported only small group patients mutations. We report case male, who presen...

BACKGROUND Both dominant and recessive mutations were reported in the gene encoding the mitochondrial (mt) DNA polymerase gamma (POLG) in patients with progressive external ophthalmoplegia (PEO). Phenotypes other than PEO were recently documented in patients with mutations in the POLG gene. OBJECTIVE To screen patients with mitochondrial disease and multiple mtDNA deletions in muscle for muta...

PURPOSE To assess the frequency and clinical features of childhood-onset intractable epilepsy caused by the most common mutations in the POLG gene, which encodes the catalytic subunit of mitochondrial DNA polymerase gamma. METHODS Children presenting with nonsyndromic intractable epilepsy of unknown etiology but without documented liver dysfunction at presentation were eligible for this prosp...

BACKGROUND/AIMS Alpers syndrome is a developmental mitochondrial DNA depletion syndrome leading to fatal brain and liver disease in children and young adults. Mutations in the gene for the mitochondrial DNA polymerase (POLG) have recently been shown to cause this disorder. METHODS The POLG locus was sequenced in 15 sequential probands diagnosed with Alpers syndrome. In addition, the POLG muta...

BACKGROUND Progressive ataxia and palatal tremor (PAPT) can be observed in both acquired brainstem or cerebellar lesions and genetic disorders. PHENOMENOLOGY SHOWN PAPT due to mutation in POLG, the gene encoding the mitochondrial DNA polymerase. EDUCATIONAL VALUE POLG mutation should be considered in patients with PAPT, particularly when additional clues such as a sensory neuronopathy or an...

The inability to replicate mitochondrial genomes (mtDNA) by the mitochondrial DNA polymerase (pol γ) leads to a subset of mitochondrial diseases. Many mutations in POLG, the gene that encodes pol γ, have been associated with mitochondrial diseases such as myocerebrohepatopathy spectrum (MCHS) disorders, Alpers-Huttenlocher syndrome, myoclonic epilepsy myopathy sensory ataxia (MEMSA), ataxia neu...

OBJECTIVE To describe an unusual clinical phenotype in an adult harboring 2 compound heterozygous polymerase γ (POLG) mutations. DESIGN Case report. SETTING University-based outpatient neurology clinic and pathology and genetics laboratory. PATIENT A 27-year-old man presenting with isolated distal myopathy of the upper extremities in the absence of sensory disturbances. RESULTS Histoche...

BACKGROUND Male fertility largely depends on the quality of sperm production, which may be affected by environmental and genetic factors. In this study, we explored a possible role of the polymerase gamma (POLG) gene polymorphism, recently reported to be associated with male infertility in some populations. METHODS The polymorphic CAG repeat (usually 10 codons long) in the POLG gene was studi...

BACKGROUND Mutations in the DNA polymerase-gamma (POLG) gene are a major cause of clinically heterogeneous mitochondrial diseases, associated with mtDNA depletion and multiple deletions. OBJECTIVE To determine the spectrum of POLG mutations in our Dutch patient cohort, to evaluate the pathogenicity of novel mutations, and to establish genotype-phenotype correlations. RESULTS The authors ide...