TY - JOUR
T1 - Clinical spectrum of mitochondrial DNA depletion due to mutations in the thymidine kinase 2 gene
AU - Oskoui, Maryam
AU - Davidzon, Guido
AU - Pascual, Juan
AU - Erazo, Ricardo
AU - Gurgel-Giannetti, Juliana
AU - Krishna, Sindu
AU - Bonilla, Eduardo
AU - De Vivo, Darryl C.
AU - Shanske, Sara
AU - DiMauro, Salvatore
N1 - Copyright:
Copyright 2008 Elsevier B.V., All rights reserved.
PY - 2006/8
Y1 - 2006/8
N2 - Background: Mitochondrial DNA depletion syndrome is an autosomal recessive disorder characterized by decreased mitochondrial DNA copy numbers in affected tissues. It has been linked to 4 genes involved in deoxyribonucleotide triphosphate metabolism: thymidine kinase 2 (TK2), deoxyguanosine kinase (DGUOK), polymerase gamma (POLG), and SUCLA2, the gene encoding the β-subunit of the adenosine diphosphate-forming succinyl coenzyme A synthetase ligase. Objective: To highlight the variability in the clinical spectrum of TK2-related mitochondrial DNA depletion syndrome. Design: Review of patients and the literature. Setting: Tertiary care university. Patients: Four patients with mitochondrial DNA depletion syndrome and mutations in the TK2 gene. Main Outcome Measures: Definition of clinical variability. Results: Patient 1 had evidence of lower motoneuron disease and was initially diagnosed as having spinal muscular atrophy type 3. Patient 2, who is alive and ambulatory at age 9 years, presented at age 2 years with a slowly progressive mitochondrial myopathy. Patient 3 had a more severe myopathy, with onset in infancy and death at age 6 years of respiratory failure. Patient 4 had a rapidly progressive congenital myopathy with rigid spine syndrome and he died at age 19 months. Conclusion: The clinical spectrum of TK2 mutations is not limited to severe infantile myopathy with motor regression and early death but includes spinal muscular atrophy type 3-like presentation, rigid spine syndrome, and subacute myopathy without motor regression and with longer survival.
AB - Background: Mitochondrial DNA depletion syndrome is an autosomal recessive disorder characterized by decreased mitochondrial DNA copy numbers in affected tissues. It has been linked to 4 genes involved in deoxyribonucleotide triphosphate metabolism: thymidine kinase 2 (TK2), deoxyguanosine kinase (DGUOK), polymerase gamma (POLG), and SUCLA2, the gene encoding the β-subunit of the adenosine diphosphate-forming succinyl coenzyme A synthetase ligase. Objective: To highlight the variability in the clinical spectrum of TK2-related mitochondrial DNA depletion syndrome. Design: Review of patients and the literature. Setting: Tertiary care university. Patients: Four patients with mitochondrial DNA depletion syndrome and mutations in the TK2 gene. Main Outcome Measures: Definition of clinical variability. Results: Patient 1 had evidence of lower motoneuron disease and was initially diagnosed as having spinal muscular atrophy type 3. Patient 2, who is alive and ambulatory at age 9 years, presented at age 2 years with a slowly progressive mitochondrial myopathy. Patient 3 had a more severe myopathy, with onset in infancy and death at age 6 years of respiratory failure. Patient 4 had a rapidly progressive congenital myopathy with rigid spine syndrome and he died at age 19 months. Conclusion: The clinical spectrum of TK2 mutations is not limited to severe infantile myopathy with motor regression and early death but includes spinal muscular atrophy type 3-like presentation, rigid spine syndrome, and subacute myopathy without motor regression and with longer survival.
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U2 - 10.1001/archneur.63.8.1122
DO - 10.1001/archneur.63.8.1122
M3 - Article
C2 - 16908738
AN - SCOPUS:33747192567
SN - 0003-9942
VL - 63
SP - 1122
EP - 1126
JO - Archives of neurology
JF - Archives of neurology
IS - 8
ER -