Low frequency of Parkin, Tyrosine Hydroxylase, and GTP Cyclohydrolase I gene mutations in a Danish population of early‐onset Parkinson's Disease
Identifieur interne : 001265 ( Main/Exploration ); précédent : 001264; suivant : 001266Low frequency of Parkin, Tyrosine Hydroxylase, and GTP Cyclohydrolase I gene mutations in a Danish population of early‐onset Parkinson's Disease
Auteurs : J. M. Hertz [Danemark] ; K. Stergaard [Danemark] ; I. Juncker [Danemark] ; S. Pedersen [Danemark] ; A. Romstad [Danemark] ; L. B. M Ller [Danemark] ; F. Güttler [Danemark] ; E. Dupont [Danemark]Source :
- European Journal of Neurology [ 1351-5101 ] ; 2006-04.
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Abstract
Autosomal recessive Parkinson's disease (PD) with early‐onset may be caused by mutations in the parkin gene (PARK2). We have ascertained 87 Danish patients with an early‐onset form of PD (age at onset ≤40 years, or ≤50 years if family history is positive) in a multicenter study in order to determine the frequency of PARK2 mutations. Analysis of the GTP cyclohydrolase I gene (GCH1) and the tyrosine hydroxylase gene (TH), mutated in dopa‐responsive dystonia and juvenile PD, have also been included. Ten different PARK2 mutations were identified in 10 patients. Two of the patients (2.3%) were found to have homozygous or compound heterozygous mutations, and eight of the patients (9.2%) were found to be heterozygous. A mutation has been identified in 10.4% of the sporadic cases and in 15.0% of cases with a positive family history of PD. One patient was found to be heterozygous for both a PARK2 mutation and a missense mutation (A6T) in TH of unknown significance. It cannot be excluded that both mutations contribute to the phenotype. No other putative disease causing TH or GCH1 mutations were found. In conclusion, homozygous, or compound heterozygous PARK2 mutations, and mutations in GCH1 and TH, are rare even in a population of PD patients with early‐onset of the disease.
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DOI: 10.1111/j.1468-1331.2006.01249.x
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We have ascertained 87 Danish patients with an early‐onset form of PD (age at onset ≤40 years, or ≤50 years if family history is positive) in a multicenter study in order to determine the frequency of PARK2 mutations. Analysis of the GTP cyclohydrolase I gene (GCH1) and the tyrosine hydroxylase gene (TH), mutated in dopa‐responsive dystonia and juvenile PD, have also been included. Ten different PARK2 mutations were identified in 10 patients. Two of the patients (2.3%) were found to have homozygous or compound heterozygous mutations, and eight of the patients (9.2%) were found to be heterozygous. A mutation has been identified in 10.4% of the sporadic cases and in 15.0% of cases with a positive family history of PD. One patient was found to be heterozygous for both a PARK2 mutation and a missense mutation (A6T) in TH of unknown significance. It cannot be excluded that both mutations contribute to the phenotype. No other putative disease causing TH or GCH1 mutations were found. 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