Dataset Information

Genetic and Phenotypic Basis of Autosomal Dominant Parkinson's Disease in a Large Multi-Center Cohort.

ABSTRACT: LRRK2, SNCA, and VPS35 are unequivocally associated with autosomal dominant Parkinson's disease (PD). We evaluated the prevalence of LRRK2, SNCA, and VPS35 mutations and associated clinical features in a large French multi-center cohort of PD patients. Demographic and clinical data were collected for 1,805 index cases (592 with autosomal dominant inheritance and 1,213 isolated cases) since 1990. All probands were screened with TaqMan assays for LRRK2 Gly2019Ser. In the absence of this mutation, the coding sequences of the three genes were analyzed by Sanger sequencing and/or next-generation sequencing. The data for the three genes were analyzed according to age at onset, family history, ethnic origin and clinical features. We identified 160 index cases (8.9%) with known pathogenic variants: 138 with pathogenic LRRK2 variants (7.6%), including 136 with the Gly2019Ser mutation, 19 with SNCA point mutations or genomic rearrangements (1.1%), and three with the VPS35 Asp620Asn mutation (0.16%). Mutation frequencies were higher in familial than isolated cases, consistent with autosomal dominant inheritance (12.0 vs. 7.3%; OR 1.7, 95% CI [1.2-2.4], p = 0.001). PD patients with LRRK2 variants were more likely to have higher rates of late-onset PD (>50 years; OR 1.5, 95% CI [1.0-2.1], p = 0.03), whereas those with SNCA mutations tended to have earlier age at onset disease (≤ 50 years, p = 0.06). The clinical features of LRRK2 carriers and those without any pathogenic variants in known PD-associated genes were similar. The likelihood of detecting disease-causing mutations was higher in cases compatible with autosomal dominant inheritance.

SUBMITTER: Lesage S

PROVIDER: S-EPMC7399219 | biostudies-literature | 2020

REPOSITORIES: biostudies-literature

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Genetic and Phenotypic Basis of Autosomal Dominant Parkinson's Disease in a Large Multi-Center Cohort.

Lesage Suzanne S Houot Marion M Mangone Graziella G Tesson Christelle C Bertrand Hélène H Forlani Sylvie S Anheim Mathieu M Brefel-Courbon Christine C Broussolle Emmanuel E Thobois Stéphane S Damier Philippe P Durif Franck F Roze Emmanuel E Tison François F Grabli David D Ory-Magne Fabienne F Degos Bertrand B Viallet François F Cormier-Dequaire Florence F Ouvrard-Hernandez Anne-Marie AM Vidailhet Marie M Lohmann Ebba E Singleton Andrew A Corvol Jean-Christophe JC Brice Alexis A

Frontiers in neurology 20200728

LRRK2, SNCA, and VPS35 are unequivocally associated with autosomal dominant Parkinson's disease (PD). We evaluated the prevalence of LRRK2, SNCA, and VPS35 mutations and associated clinical features in a large French multi-center cohort of PD patients. Demographic and clinical data were collected for 1,805 index cases (592 with autosomal dominant inheritance and 1,213 isolated cases) since 1990. All probands were screened with TaqMan assays for LRRK2 Gly2019Ser ...[more]

PMID: 32849182

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Project description:Retinitis pigmentosa (RP) is the most common form of inherited retinal dystrophy, and 15-25% of RP is transmitted as an autosomal dominant (ad) trait. The objectives of this study were to establish the variant profile in a large cohort of adRP families and to elucidate the variant spectrum of each adRP gene in Chinese patients. A total of 138 probands clinically diagnosed with RP as a presumed autosomal dominant trait were recruited. All probands underwent ophthalmic examinations by specialists. A combination of molecular screening methods, including targeted next-generation sequencing, Sanger DNA sequencing, and multiplex ligation probe amplification assay, was used to detect variants. We identified heterozygous variants of 11 adRP genes in 73 probands, hemizygous, or heterozygous variants of X-linked RP genes in six patients, compound heterozygous variants of autosomal recessive RP genes in three pseudodominant families, and one heterozygous variant of one ad cone and rod dystrophy gene in one proband. One proband was found carrying both variants in RPGR and FAM161A. The overall detection rate was 59.4% (82/138). We detected 72 distinct disease-causing variants involving 16 RP genes and one cone-rod dystrophy gene; 33 of these variants have not been reported previously. Disease-causing variants were identified in the adRP genes in 52.9% of the families, followed by 4.3% in the X-linked RP genes, and 2.2% in the autosomal recessive genes. The most frequent mutant genes were RHO, PRPF31, RP1, SNRNP200, and PRPF8, which explained up to 78.0% of the genetically diagnosed families. Most of the variants identified in adRP genes were missense, and copy number variations were common (7/20) in the PRPF31 gene. We established the profile of the mutated genes and the variant spectrum of adRP genes in a large cohort of Chinese patients, providing essential information for genetic counseling and future development of therapeutics for retinal dystrophy inherited as a dominant trait.

Project description:BackgroundThe use of proactive genetic screening for disease prevention and early detection is not yet widespread. Professional practice guidelines from the American College of Medical Genetics and Genomics (ACMG) have encouraged reporting pathogenic variants that confer personal risk for actionable monogenic hereditary disorders, but only as secondary findings from exome or genome sequencing. The Centers for Disease Control and Prevention (CDC) recognizes the potential public health impact of three Tier 1 actionable disorders. Here, we report results of a large multi-center cohort study to determine the yield and potential value of screening healthy individuals for variants associated with a broad range of actionable monogenic disorders, outside the context of secondary findings.MethodsEligible adults were offered a proactive genetic screening test by health care providers in a variety of clinical settings. The screening panel based on next-generation sequencing contained up to 147 genes associated with monogenic disorders within cancer, cardiovascular, and other important clinical areas. Sequence and intragenic copy number variants classified as pathogenic, likely pathogenic, pathogenic (low penetrance), or increased risk allele were considered clinically significant and reported. Results were analyzed by clinical area and severity/burden of disease using chi-square tests without Yates' correction.ResultsAmong 10,478 unrelated adults screened, 1619 (15.5%) had results indicating personal risk for an actionable monogenic disorder. In contrast, only 3.1 to 5.2% had clinically reportable variants in genes suggested by the ACMG version 2 secondary findings list to be examined during exome or genome sequencing, and 2% had reportable variants related to CDC Tier 1 conditions. Among patients, 649 (6.2%) were positive for a genotype associated with a disease of high severity/burden, including hereditary cancer syndromes, cardiovascular disorders, or malignant hyperthermia susceptibility.ConclusionsThis is one of the first real-world examples of specialists and primary care providers using genetic screening with a multi-gene panel to identify health risks in their patients. Nearly one in six individuals screened for variants associated with actionable monogenic disorders had clinically significant results. These findings provide a foundation for further studies to assess the role of genetic screening as part of regular medical care.

Dataset Information

Genetic and Phenotypic Basis of Autosomal Dominant Parkinson's Disease in a Large Multi-Center Cohort.

Publications

Genetic and Phenotypic Basis of Autosomal Dominant Parkinson's Disease in a Large Multi-Center Cohort.

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