Dopaminergic denervation severity depends on COMT Val158Met polymorphism in Parkinson’s disease
Identifieur interne : 000332 ( Hal/Corpus ); précédent : 000331; suivant : 000333Dopaminergic denervation severity depends on COMT Val158Met polymorphism in Parkinson’s disease
Auteurs : Julia Muellner ; Iman Gharrad ; Marie-Odile Habert ; Aurélie Kas ; Jean-Baptiste Martini ; Florence Cormier-Dequaire ; Khadija Tahiri ; Marie Vidailhet ; Niklaus Meier ; Alexis Brice ; Michael Schuepbach ; Alain Mallet ; Andreas Hartmann ; Jean-Christophe CorvolSource :
- Parkinsonism and Related Disorders [ 1353-8020 ] ; 2015-02-19.
English descriptors
Abstract
Background : Catecholamine-O-methyl-tranferase (COMT) initiates dopamine degradation. Its activity is mainly determined by a single nucleotide polymorphism in the COMT gene (Val158Met, rs4680) separating high (Val/Val, COMTHH), intermediate (Val/Met, COMTHL) and low metabolizers (Met/Met, COMTLL). We investigated dopaminergic denervation in the striatum in PD patients according to COMT rs4680 genotype.Methods : Patients with idiopathic PD were assessed for motor severity (UPDRS-III rating scale in OFF-state), dopaminergic denervation using [123I]-FP-CIT SPECT imaging, and genotyped for the COMT rs4680 enzyme. [123I]-FP-CIT binding potential (BP) for each voxel was defined by the ratio of tracer-binding in the region of interest (striatum, caudate nucleus and putamen) to that in a region of non-specific activity. Genotyping was performed using TaqMan® SNP genotyping assay. We used a regression model to evaluate the effect of COMT genotype on the BP in the striatum and its sub-regions.Results : Genotype distribution was: 11 (27.5%) COMTHH, 26 (65%) COMTHL and 3 (7.5%) COMTLL. There were no significant differences in disease severity, treatments, or motor scores between genotypes. When adjusted to clinical severity, gender and age, low and intermediate metabolizers showed significantly higher rates of striatal denervation (COMTHL+LL BP=1.32 +/- 0.04) than high metabolizers (COMTHH, BP=1.6 +/- 0.08; F(1.34)=9.0, p=0.005). Striatal sub-regions showed similar results. BP and UPDRS-III motor scores (r=0.44, p=0.04) (p<0.001) were highly correlated. There was a gender effect, but no gender-genotype interaction.Conclusions : Striatal denervation differs according to COMT-Val158Met polymorphism. COMT activity may play a role as a compensatory mechanism in PD motor symptoms.
Url:
DOI: 10.1016/j.parkreldis.2015.02.009
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Hal:hal-01120290Le document en format XML
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<front><div type="abstract" xml:lang="en">Background : Catecholamine-O-methyl-tranferase (COMT) initiates dopamine degradation. Its activity is mainly determined by a single nucleotide polymorphism in the COMT gene (Val158Met, rs4680) separating high (Val/Val, COMTHH), intermediate (Val/Met, COMTHL) and low metabolizers (Met/Met, COMTLL). We investigated dopaminergic denervation in the striatum in PD patients according to COMT rs4680 genotype.Methods : Patients with idiopathic PD were assessed for motor severity (UPDRS-III rating scale in OFF-state), dopaminergic denervation using [123I]-FP-CIT SPECT imaging, and genotyped for the COMT rs4680 enzyme. [123I]-FP-CIT binding potential (BP) for each voxel was defined by the ratio of tracer-binding in the region of interest (striatum, caudate nucleus and putamen) to that in a region of non-specific activity. Genotyping was performed using TaqMan® SNP genotyping assay. We used a regression model to evaluate the effect of COMT genotype on the BP in the striatum and its sub-regions.Results : Genotype distribution was: 11 (27.5%) COMTHH, 26 (65%) COMTHL and 3 (7.5%) COMTLL. There were no significant differences in disease severity, treatments, or motor scores between genotypes. When adjusted to clinical severity, gender and age, low and intermediate metabolizers showed significantly higher rates of striatal denervation (COMTHL+LL BP=1.32 +/- 0.04) than high metabolizers (COMTHH, BP=1.6 +/- 0.08; F(1.34)=9.0, p=0.005). Striatal sub-regions showed similar results. BP and UPDRS-III motor scores (r=0.44, p=0.04) (p<0.001) were highly correlated. There was a gender effect, but no gender-genotype interaction.Conclusions : Striatal denervation differs according to COMT-Val158Met polymorphism. COMT activity may play a role as a compensatory mechanism in PD motor symptoms.</div>
</front>
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<author role="aut"> <persName> <forename type="first">Florence</forename>
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<abstract xml:lang="en">Background : Catecholamine-O-methyl-tranferase (COMT) initiates dopamine degradation. Its activity is mainly determined by a single nucleotide polymorphism in the COMT gene (Val158Met, rs4680) separating high (Val/Val, COMTHH), intermediate (Val/Met, COMTHL) and low metabolizers (Met/Met, COMTLL). We investigated dopaminergic denervation in the striatum in PD patients according to COMT rs4680 genotype.Methods : Patients with idiopathic PD were assessed for motor severity (UPDRS-III rating scale in OFF-state), dopaminergic denervation using [123I]-FP-CIT SPECT imaging, and genotyped for the COMT rs4680 enzyme. [123I]-FP-CIT binding potential (BP) for each voxel was defined by the ratio of tracer-binding in the region of interest (striatum, caudate nucleus and putamen) to that in a region of non-specific activity. Genotyping was performed using TaqMan® SNP genotyping assay. We used a regression model to evaluate the effect of COMT genotype on the BP in the striatum and its sub-regions.Results : Genotype distribution was: 11 (27.5%) COMTHH, 26 (65%) COMTHL and 3 (7.5%) COMTLL. There were no significant differences in disease severity, treatments, or motor scores between genotypes. When adjusted to clinical severity, gender and age, low and intermediate metabolizers showed significantly higher rates of striatal denervation (COMTHL+LL BP=1.32 +/- 0.04) than high metabolizers (COMTHH, BP=1.6 +/- 0.08; F(1.34)=9.0, p=0.005). Striatal sub-regions showed similar results. BP and UPDRS-III motor scores (r=0.44, p=0.04) (p<0.001) were highly correlated. There was a gender effect, but no gender-genotype interaction.Conclusions : Striatal denervation differs according to COMT-Val158Met polymorphism. COMT activity may play a role as a compensatory mechanism in PD motor symptoms.</abstract>
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