Browsing by Author "Lohmann, Katja"

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    Author Correction: Elucidating causative gene variants in hereditary Parkinson’s disease in the Global Parkinson’s Genetics Program (GP2)
    (Springer Nature, 2023-09-13) Lange, Lara M.; Avenali, Micol; Ellis, Melina; Illarionova, Anastasia; Keller Sarmiento, Ignacio J.; Tan, Ai-Huey; Madoev, Harutyun; Galandra, Caterina; Junker, Johanna; Roopnarain, Karisha; Solle, Justin; Wegel, Claire; Fang, Zih-Hua; Heutink, Peter; Kumar, Kishore R.; Lim, Shen-Yang; Valente, Enza Maria; Nalls, Mike; Blauwendraat, Cornelis; Singleton, Andrew; Mencacci, Niccolo; Lohmann, Katja; Klein, Christine; Global Parkinson’s Genetic Program (GP2); Medical and Molecular Genetics, School of Medicine
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    Elucidating causative gene variants in hereditary Parkinson's disease in the Global Parkinson's Genetics Program (GP2)
    (Springer Nature, 2023-06-27) Lange, Lara M.; Avenali, Micol; Ellis, Melina; Illarionova, Anastasia; Keller Sarmiento, Ignacio J.; Tan, Ai-Huey; Madoev, Harutyun; Galandra, Caterina; Junker, Johanna; Roopnarain, Karisha; Solle, Justin; Wegel, Claire; Fang, Zih-Hua; Heutink, Peter; Kumar, Kishore R.; Lim, Shen-Yang; Valente, Enza Maria; Nalls, Mike; Blauwendraat, Cornelis; Singleton, Andrew; Mencacci, Niccolo; Lohmann, Katja; Klein, Christine; Global Parkinson’s Genetic Program (GP2); Medical and Molecular Genetics, School of Medicine
    The Monogenic Network of the Global Parkinson’s Genetics Program (GP2) aims to create an efficient infrastructure to accelerate the identification of novel genetic causes of Parkinson’s disease (PD) and to improve our understanding of already identified genetic causes, such as reduced penetrance and variable clinical expressivity of known disease-causing variants. We aim to perform short- and long-read whole-genome sequencing for up to 10,000 patients with parkinsonism. Important features of this project are global involvement and focusing on historically underrepresented populations.
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    Parkinson's disease variant detection and disclosure: PD GENEration, a North American study
    (Oxford University Press, 2024) Cook, Lola; Verbrugge, Jennifer; Schwantes-An, Tae-Hwi; Schulze, Jeanine; Foroud, Tatiana; Hall, Anne; Marder, Karen S.; Mata, Ignacio F.; Mencacci, Niccolò E.; Nance, Martha A.; Schwarzschild, Michael A.; Simuni, Tanya; Bressman, Susan; Wills, Anne-Marie; Fernandez, Hubert H.; Litvan, Irene; Lyons, Kelly E.; Shill, Holly A.; Singer, Carlos; Tropea, Thomas F.; Vanegas Arroyave, Nora; Carbonell, Janfreisy; Cruz Vicioso, Rossy; Katus, Linn; Quinn, Joseph F.; Hodges, Priscila D.; Meng, Yan; Strom, Samuel P.; Blauwendraat, Cornelis; Lohmann, Katja; Casaceli, Cynthia; Rao, Shilpa C.; Ghosh Galvelis, Kamalini; Naito, Anna; Beck, James C.; Alcalay, Roy N.; Medical and Molecular Genetics, School of Medicine
    Variants in seven genes (LRRK2, GBA1, PRKN, SNCA, PINK1, PARK7 and VPS35) have been formally adjudicated as causal contributors to Parkinson's disease; however, individuals with Parkinson's disease are often unaware of their genetic status since clinical testing is infrequently offered. As a result, genetic information is not incorporated into clinical care, and variant-targeted precision medicine trials struggle to enrol people with Parkinson's disease. Understanding the yield of genetic testing using an established gene panel in a large, geographically diverse North American population would help patients, clinicians, clinical researchers, laboratories and insurers better understand the importance of genetics in approaching Parkinson's disease. PD GENEration is an ongoing multi-centre, observational study (NCT04057794, NCT04994015) offering genetic testing with results disclosure and genetic counselling to those in the US (including Puerto Rico), Canada and the Dominican Republic, through local clinical sites or remotely through self-enrolment. DNA samples are analysed by next-generation sequencing including deletion/duplication analysis (Fulgent Genetics) with targeted testing of seven major Parkinson's disease-related genes. Variants classified as pathogenic/likely pathogenic/risk variants are disclosed to all tested participants by either neurologists or genetic counsellors. Demographic and clinical features are collected at baseline visits. Between September 2019 and June 2023, the study enrolled 10 510 participants across >85 centres, with 8301 having received results. Participants were: 59% male; 86% White, 2% Asian, 4% Black/African American, 9% Hispanic/Latino; mean age 67.4 ± 10.8 years. Reportable genetic variants were observed in 13% of all participants, including 18% of participants with one or more 'high risk factors' for a genetic aetiology: early onset (<50 years), high-risk ancestry (Ashkenazi Jewish/Basque/North African Berber), an affected first-degree relative; and, importantly, in 9.1% of people with none of these risk factors. Reportable variants in GBA1 were identified in 7.7% of all participants; 2.4% in LRRK2; 2.1% in PRKN; 0.1% in SNCA; and 0.2% in PINK1, PARK7 or VPS35 combined. Variants in more than one of the seven genes were identified in 0.4% of participants. Approximately 13% of study participants had a reportable genetic variant, with a 9% yield in people with no high-risk factors. This supports the promotion of universal access to genetic testing for Parkinson's disease, as well as therapeutic trials for GBA1 and LRRK2-related Parkinson's disease.
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    Relevance of genetic testing in the gene-targeted trial era: the Rostock Parkinson's disease study
    (Oxford University Press, 2024) Westenberger, Ana; Skrahina, Volha; Usnich, Tatiana; Beetz, Christian; Vollstedt, Eva-Juliane; Laabs, Björn-Hergen; Paul, Jefri J.; Curado, Filipa; Skobalj, Snezana; Gaber, Hanaa; Olmedillas, Maria; Bogdanovic, Xenia; Ameziane, Najim; Schell, Nathalie; Aasly, Jan Olav; Afshari, Mitra; Agarwal, Pinky; Aldred, Jason; Alonso-Frech, Fernando; Anderson, Roderick; Araújo, Rui; Arkadir, David; Avenali, Micol; Balal, Mehmet; Benizri, Sandra; Bette, Sagari; Bhatia, Perminder; Bonello, Michael; Braga-Neto, Pedro; Brauneis, Sarah; Costa Cardoso, Francisco Eduardo; Cavallieri, Francesco; Classen, Joseph; Cohen, Lisa; Coletta, Della; Crosiers, David; Cullufi, Paskal; Dashtipour, Khashayar; Demirkiran, Meltem; de Carvalho Aguiar, Patricia; De Rosa, Anna; Djaldetti, Ruth; Dogu, Okan; Dos Santos Ghilardi, Maria Gabriela; Eggers, Carsten; Elibol, Bulent; Ellenbogen, Aaron; Ertan, Sibel; Fabiani, Giorgio; Falkenburger, Björn H.; Farrow, Simon; Fay-Karmon, Tsviya; Ferencz, Gerald J.; Fonoff, Erich Talamoni; Fragoso, Yara Dadalti; Genç, Gençer; Gorospe, Arantza; Grandas, Francisco; Gruber, Doreen; Gudesblatt, Mark; Gurevich, Tanya; Hagenah, Johann; Hanagasi, Hasmet A.; Hassin-Baer, Sharon; Hauser, Robert A.; Hernández-Vara, Jorge; Herting, Birgit; Hinson, Vanessa K.; Hogg, Elliot; Hu, Michele T.; Hummelgen, Eduardo; Hussey, Kelly; Infante, Jon; Isaacson, Stuart H.; Jauma, Serge; Koleva-Alazeh, Natalia; Kuhlenbäumer, Gregor; Kühn, Andrea; Litvan, Irene; López-Manzanares, Lydia; Luxmore, McKenzie; Manandhar, Sujeena; Marcaud, Veronique; Markopoulou, Katerina; Marras, Connie; McKenzie, Mark; Matarazzo, Michele; Merello, Marcelo; Mollenhauer, Brit; Morgan, John C.; Mullin, Stephen; Musacchio, Thomas; Myers, Bennett; Negrotti, Anna; Nieves, Anette; Nitsan, Zeev; Oskooilar, Nader; Öztop-Çakmak, Özgür; Pal, Gian; Pavese, Nicola; Percesepe, Antonio; Piccoli, Tommaso; Pinto de Souza, Carolina; Prell, Tino; Pulera, Mark; Raw, Jason; Reetz, Kathrin; Reiner, Johnathan; Rosenberg, David; Ruiz-Lopez, Marta; Ruiz Martinez, Javier; Sammler, Esther; Santos-Lobato, Bruno Lopes; Saunders-Pullman, Rachel; Schlesinger, Ilana; Schofield, Christine M.; Schumacher-Schuh, Artur F.; Scott, Burton; Sesar, Ángel; Shafer, Stuart J.; Sheridan, Ray; Silverdale, Monty; Sophia, Rani; Spitz, Mariana; Stathis, Pantelis; Stocchi, Fabrizio; Tagliati, Michele; Tai, Yen F.; Terwecoren, Annelies; Thonke, Sven; Tönges, Lars; Toschi, Giulia; Tumas, Vitor; Urban, Peter Paul; Vacca, Laura; Vandenberghe, Wim; Valente, Enza Maria; Valzania, Franco; Vela-Desojo, Lydia; Weill, Caroline; Weise, David; Wojcieszek, Joanne; Wolz, Martin; Yahalom, Gilad; Yalcin-Cakmakli, Gul; Zittel, Simone; Zlotnik, Yair; Kandaswamy, Krishna K.; Balck, Alexander; Hanssen, Henrike; Borsche, Max; Lange, Lara M.; Csoti, Ilona; Lohmann, Katja; Kasten, Meike; Brüggemann, Norbert; Rolfs, Arndt; Klein, Christine; Bauer, Peter; Neurology, School of Medicine
    Estimates of the spectrum and frequency of pathogenic variants in Parkinson's disease (PD) in different populations are currently limited and biased. Furthermore, although therapeutic modification of several genetic targets has reached the clinical trial stage, a major obstacle in conducting these trials is that PD patients are largely unaware of their genetic status and, therefore, cannot be recruited. Expanding the number of investigated PD-related genes and including genes related to disorders with overlapping clinical features in large, well-phenotyped PD patient groups is a prerequisite for capturing the full variant spectrum underlying PD and for stratifying and prioritizing patients for gene-targeted clinical trials. The Rostock Parkinson's disease (ROPAD) study is an observational clinical study aiming to determine the frequency and spectrum of genetic variants contributing to PD in a large international cohort. We investigated variants in 50 genes with either an established relevance for PD or possible phenotypic overlap in a group of 12 580 PD patients from 16 countries [62.3% male; 92.0% White; 27.0% positive family history (FH+), median age at onset (AAO) 59 years] using a next-generation sequencing panel. Altogether, in 1864 (14.8%) ROPAD participants (58.1% male; 91.0% White, 35.5% FH+, median AAO 55 years), a PD-relevant genetic test (PDGT) was positive based on GBA1 risk variants (10.4%) or pathogenic/likely pathogenic variants in LRRK2 (2.9%), PRKN (0.9%), SNCA (0.2%) or PINK1 (0.1%) or a combination of two genetic findings in two genes (∼0.2%). Of note, the adjusted positive PDGT fraction, i.e. the fraction of positive PDGTs per country weighted by the fraction of the population of the world that they represent, was 14.5%. Positive PDGTs were identified in 19.9% of patients with an AAO ≤ 50 years, in 19.5% of patients with FH+ and in 26.9% with an AAO ≤ 50 years and FH+. In comparison to the idiopathic PD group (6846 patients with benign variants), the positive PDGT group had a significantly lower AAO (4 years, P = 9 × 10-34). The probability of a positive PDGT decreased by 3% with every additional AAO year (P = 1 × 10-35). Female patients were 22% more likely to have a positive PDGT (P = 3 × 10-4), and for individuals with FH+ this likelihood was 55% higher (P = 1 × 10-14). About 0.8% of the ROPAD participants had positive genetic testing findings in parkinsonism-, dystonia/dyskinesia- or dementia-related genes. In the emerging era of gene-targeted PD clinical trials, our finding that ∼15% of patients harbour potentially actionable genetic variants offers an important prospect to affected individuals and their families and underlines the need for genetic testing in PD patients. Thus, the insights from the ROPAD study allow for data-driven, differential genetic counselling across the spectrum of different AAOs and family histories and promote a possible policy change in the application of genetic testing as a routine part of patient evaluation and care in PD.