Unbalanced deoxynucleotide pools cause mitochondrial DNA instability in thymidine phosphorylase-deficient mice.
Hum Mol Genet
; 18(4): 714-22, 2009 Feb 15.
Article
en En
| MEDLINE
| ID: mdl-19028666
ABSTRACT
Replication and repair of DNA require equilibrated pools of deoxynucleoside triphosphate precursors. This concept has been proven by in vitro studies over many years, but in vivo models are required to demonstrate its relevance to multicellular organisms and to human diseases. Accordingly, we have generated thymidine phosphorylase (TP) and uridine phosphorylase (UP) double knockout (TP(-/-)UP(-/-)) mice, which show severe TP deficiency, increased thymidine and deoxyuridine in tissues and elevated mitochondrial deoxythymidine triphosphate. As consequences of the nucleotide pool imbalances, brains of mutant mice developed partial depletion of mtDNA, deficiencies of respiratory chain complexes and encephalopathy. These findings largely account for the pathogenesis of mitochondrial neurogastrointestinal encephalopathy (MNGIE), the first inherited human disorder of nucleoside metabolism associated with somatic DNA instability.
Texto completo:
1
Banco de datos:
MEDLINE
Asunto principal:
Errores Innatos del Metabolismo de la Purina-Pirimidina
/
Timidina Fosforilasa
/
Uridina Fosforilasa
/
ADN Mitocondrial
/
Inestabilidad Genómica
/
Desoxirribonucleótidos
Tipo de estudio:
Prognostic_studies
Límite:
Animals
/
Humans
Idioma:
En
Revista:
Hum Mol Genet
Asunto de la revista:
BIOLOGIA MOLECULAR
/
GENETICA MEDICA
Año:
2009
Tipo del documento:
Article
País de afiliación:
Estados Unidos