Phenotypic variations in 3 children with POLG1 mutations.

Abstract

Autosomal inherited mitochondrial diseases have been of increasing interest among clinicians and mitochondrial research groups because these diseases are caused through a secondary effect on the mitochondrial DNA. It was thought that the genetic stability of mitochondrial DNA relies on the accuracy of DNA polymerase gamma. Mutations of DNA polymerase gamma 1 gene (MIM# 174763) have been shown to be a cause of mitochondrial disorders associated with Mendelian disorders characterized by multiple mitochondrial DNA deletions or depletions. To date, several clinical phenotypes associated with polymerase gamma mutation have been reported presenting in both adults and children. We present 3 children in whom were found to have reported pathogenic DNA polymerase gamma 1 mutations: heterozygous p.G517V in 2 half siblings and heterozygous p.T251I and p.P587L in the other. The aim of this communication is to report 3 pediatric cases associated with DNA polymerase gamma 1 mutations to augment the expanding clinical phenotype that has been previously reported.

• Authors: Prinyarat Burusnukul, Emily C de los Reyes
• Journal: Journal of child neurology (J Child Neurol) Vol. 24 Issue 4 Pg. 482-6 (Apr 2009) ISSN: 1708-8283 [Electronic] United States
• PMID: 19189930 (Publication Type: Case Reports, Journal Article)

Chemical References

• DNA, Mitochondrial
• Genetic Markers
• DNA Polymerase gamma
• DNA-Directed DNA Polymerase
• POLG protein, human

Topics

• Child
• Child, Preschool
• Chromosome Disorders (genetics)
• DNA Mutational Analysis
• DNA Polymerase gamma
• DNA, Mitochondrial (genetics)
• DNA-Directed DNA Polymerase (genetics)
• Developmental Disabilities (enzymology, genetics, physiopathology)
• Epilepsy (enzymology, genetics, physiopathology)
• Genetic Markers (genetics)
• Genetic Predisposition to Disease (genetics)
• Genotype
• Humans
• Infant
• Inheritance Patterns (genetics)
• Male
• Mitochondrial Diseases (enzymology, genetics, physiopathology)
• Mutation (genetics)
• Myoclonus (enzymology, genetics, physiopathology)
• Phenotype
• Predictive Value of Tests
• Prognosis