O A Ross

..20-2.83; p = 0.006). Haplotype analysis suggests an ancestral founder for carriers approximately 2,500 years ago. These findings support the importance of LRRK2 variants in sporadic Parkinson's disease. Ann Neurol 2008...

..Herein we characterize five families with parkinsonism that have been identified to harbor multiplication of the chromosomal 4q21 locus containing the alpha-synuclein gene (SNCA)...

..Taken together our results do not support a role for Omi/HtrA2 variants in the pathogenesis of Parkinson's disease...

..4,617 controls) and PD (678 PDs vs. 712 controls) for association with disease risk (case-controls), age-at-diagnosis (cases) and brain gene expression levels (autopsied subjects)...

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..Here, we review the role of copy number variants and the mechanistic insights they have provided on the pathogenesis of Parkinson's disease...

..These data do not support a role for this common variant in PD etiology...

..No evidence was found for the presence of a mutation at this codon in our series. These data would suggest that this Lrrk2 variant does not contribute in susceptibility to PSP...

..The absence of this variant in control subjects and the presence of two other pathogenic variants at this amino acid position collectively support the contention that R1441H is a pathogenic substitution...

..16, n=2696). We observed a modest association between DBH -1021C>T and AAO in the combined series (p=0.01). Taken together, these findings indicate that DBH -1021C>T does not play a major role in the pathogenesis of Parkinson's disease...

..Given the ethnic-specific LRRK2 variation previously identified in PD further studies in under-represented populations are warranted...

..It is now crucial to identify the susceptibility allele and elucidate its functionality which may generate a therapeutic target for PD...

..We therefore assessed the frequency of LRRK2 exonic variants in individuals with and without PD, to investigate the role of the variants in PD susceptibility...

..Whilst an association between the tau gene (MAPT)-containing H1 haplotype and supranuclear gaze palsy (PSP) has long been recognized, the effect of H1 on risk for Parkinson's disease (PD) has remained more contentious...

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..Recently, an association was reported between the calcium buffer, calbindin (rs1805874) and risk of PD in a Japanese patient-control series...

..The Lrrk2 protein is a member of the ROCO family, which also includes Lrrk1 and Dapk1. Functional genetic variants of the DAPK1 gene (rs4877365 and rs4878104) have been previously associated with Alzheimer's disease...

..In the current study, we attempt to validate previously published findings, evaluating gene-gene interactions between SNCA, MAPT, and GSK3B in association with PD...

..Our work highlights the fact that a proportion of clinically typical, late-onset PD cases have a genetic basis...

..rs5848 is located within a micro-RNA binding site and affects the expression of GRN...

..Several dominantly inherited pathogenic substitutions have been identified in different domains of the Lrrk2 protein. Herein, we characterize the clinical and genetic features associated with Lrrk2 p.R1441C...

..However we can not rule out other genetic variation at the LRRK2 locus may play a role in parkinsonian disorders with amyotrophic lateral sclerosis and may be considered candidates for genetic screening...

..15, P=0.27). When combining all four series the observed trend was statistically significant (OR: 1.30, P<0.001). This study shows that reappraisal of publicly available results of GWAS may help nominate new risk factors for PD...

..This study does not support a significant role for genetic variation at the GCH1 locus in EOPD. However, our results further highlight the relevance of PRKN screening in familial EOPD...

..None of these patients presented with a family history of parkinsonism at the time of diagnosis. Thus, approximately 5% of sporadic patients with PD from the North of Spain have either Lrrk2 G2019S or R1441G substitutions...

..This study evaluated whether genetic risk factors for CAD and MI also affect susceptibility to ischaemic stroke in Caucasians and African Americans...

..Using a sliding scale of MAPT H1-specific haplotypes--in age/sex-matched PD cases and controls from central Norway--we have refined the disease association to within an approximately 90-kb interval of the 5' end of the MAPT locus...

..3; 95% CI: 0.6-2.8; P = 0.45). These findings highlight the importance of using family-based studies and multiple population screenings when examining the association of these polymorphic LRRK2 gene variants with Parkinson's disease...

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..Comparison of evolutionary interspecies sequences of LRRK1 and LRRK2 suggests they diverged from a common founder gene...

..Our data suggest that the association between ELAVL4 and PD previously observed might be explained by a Celtic-founder effect...

..Our study demonstrates a significant association between LINGO1 rs9652490 and essential tremor (P = 0.014) and Parkinson disease (P = 0.0003), thus providing the first evidence of a genetic link between both diseases...

..2 years younger age at disease onset. In conclusion we show that the interaction of Lrrk1-Lrrk2 can form protein dimers and this interaction may influence the age of symptomatic manifestation in Lrrk2-parkinsonism patients...

..Our data indicate that genetic variability in USP24 is associated with PD. Although our work extends and confirms a previous report, the observed effect size does not explain the PARK10 linkage peak...

..0 (95% CI: 0.3-29, p=0.3). All three affected carriers were classified as diffuse Lewy body disease (n=3/50; 6%). Our study suggests glucosidase-beta variants have a limited role in susceptibility to Lewy body disease in North America...

..We found no evidence of association between FGF20 variability and PD risk, and no relationship between the rs12720208 genotype, FGF20 and alpha-synuclein protein levels...

..Our findings show that DCTN1 mutations, previously associated with motor neuron disease, can underlie the selective vulnerability of other neuronal populations in distinct neurodegenerative disorders...

..As future therapies are targeted to specific protein abnormalities, identifying the genetic causes and associated clinical and pathological features will determine diagnosis, preventative medicine and drug intervention strategies...

..To determine the association of the genes that encode alpha-, beta-, and gamma-synuclein (SNCA, SNCB, and SNCG, respectively) with diffuse Lewy body disease (DLBD)...

..The "common" LRRK2 G2019S kinase domain substitution has been reported to account for approximately 5% of familial and 1% of sporadic Parkinson disease...

..Two rare coding variants ss65713826 and ss65713830 were more frequent in patients than controls. However, their identification in healthy controls and lack of co-segregation with disease suggests they may represent benign polymorphisms...

..Moreover, our findings demonstrate that common genetic coding variants contribute to Parkinson's disease in a population specific manner which may have important implications for future genome-wide association studies...

..A role for Lrrk2 in neurogenesis might provide further insight into the aberrant role of mutant protein in age-associated neurodegeneration with pleomorphic pathology...

..Previous epidemiologic and genetic studies have suggested a link between Parkinson disease (PD), essential tremor (ET), and restless legs syndrome (RLS)...

..Statistical analysis failed to identify significant differences in the frequency of these variants between the case and control groups; therefore our results do not support a role for these DRD3 and HS1BP3 variants in PD...

..However, in vivo studies are required to assess whether there is an indirect link between Lrrk2 and parkin in disease pathogenesis...

..However, these results do not exclude a possible role of other genetic variants within the LRRK2 gene in AD or other forms of dementia...

..The Lrrk2 kinase domain G2019S substitution is the most common genetic basis of familial and sporadic parkinsonism. Patients harboring the G2019S substitution usually present with clinical Parkinson's disease...

..Herein, we provide an overview of the genetics of PD, how these discoveries are revolutionizing long-held beliefs and more importantly how this knowledge may be translated into patient therapy...

..Identifying possible genetic determinants of outcome will also open new avenues of research into stroke therapeutics beyond thrombolysis...

..The present study did not find any SNCA multiplications in a series of 58 pathologically confirmed MSA cases excluding this event as a common cause of MSA. The question of a genetic component in MSA remains to be answered...

..G2019S variant in North Africa...

..These findings may be coincidental; however, there is a small nucleus of LRRK2-positive patients displaying atypical features suggesting a role for this protein in other neurodegenerative disorders...

..Herein we discuss these genes and the potential role of genetics in the more common sporadic form of stroke and therapeutic intervention strategies...

..Future investigation of these candidates is now warranted and may help resolve the pathomechanism behind Lrrk2 neurodegeneration...

..However, no age-related allele or genotype frequencies were observed for either polymorphic nucleotide...

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..Five populations were investigated, Northern Ireland, South African Zulu, Omani, Singapore Chinese and Mexican Mestizos...

..These results would suggest that polymorphism of the alpha-synuclein gene may not play as significant a role in the pathogenesis of idiopathic PD as previously hypothesised...

..These findings lead one to postulate that the mt4216C variant, in linkage with the mtDNA TJ cluster, may influence mitochondrial dysfunction, resulting in an increased risk of PD...

..Better determination of subsets of PD patients based upon the presence of specific phenotypic features may improve the accuracy of association studies...

..Our findings highlight the importance of Lrrk2 parkinsonism in this population and may have important consequences for its extended Diaspora in North, Central and South Americas...

..These findings suggest Lrrk2 G2019S may play an important role in Parkinson's disease on the South American Continent and further studies are now warranted...

..The influence of the G2019S substitution on protein function and disease phenotype has yet to be fully resolved, but its elucidation will undoubtedly further our understanding of the mechanisms underlying Parkinson's disease...

..In view of the lack of studies to date, investigating the role of the KIR gene system in healthy ageing, further analysis of KIR diversity is required to fully elucidate it's role in respect to age-related disease and longevity...

..This study observed no differences in the frequency of cytokine promoter polymorphisms associated with variant levels of expression in patients with CF and a non-CF population of Northern Ireland...

..These findings would suggest that polymorphism of cytokine genes may not play as crucial a role in healthy ageing as previously believed...

..A similar explanation may also apply to the in vitro model of T cell ageing if the vast majority of the cells are replicating rather than entering senescence...

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