Browsing by Author "Beetz, Christian"

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    Defining the clinical, molecular and imaging spectrum of adaptor protein complex 4-associated hereditary spastic paraplegia
    (OXFORD UNIV PRESS, 2020-01-01) Ebrahimi-Fakhari, Darius; Teinert, Julian; Behne, Robert; Wimmer, Miriam; D'Amore, Angelica; Eberhardt, Kathrin; Brechmann, Barbara; Ziegler, Marvin; Jensen, Dana M.; Nagabhyrava, Premsai; Geisel, Gregory; Carmody, Erin; Shamshad, Uzma; Dies, Kira A.; Yuskaitis, Christopher J.; Salussolia, Catherine L.; Ebrahimi-Fakhari, Daniel; Pearson, Toni S.; Saffari, Afshin; Ziegler, Andreas; Koelker, Stefan; Volkmann, Jens; Wiesener, Antje; Bearden, David R.; Lakhani, Shenela; Segal, Devorah; Udwadia-Hegde, Anaita; Martinuzzi, Andrea; Hirst, Jennifer; Perlman, Seth; Takiyama, Yoshihisa; Xiromerisiou, Georgia; Vill, Katharina; Walker, William O.; Shukla, Anju; Gupta, Rachana Dubey; Dahl, Niklas; Aksoy, Ayse; Verhelst, Helene; Delgado, Mauricio R.; Pourova, Radka Kremlikova; Sadek, Abdelrahim A.; Elkhateeb, Nour M.; Blumkin, Lubov; Brea-Fernandez, Alejandro J.; Dacruz-Alvarez, David; Smol, Thomas; Ghoumid, Jamal; Miguel, Diego; Heine, Constanze; Schlump, Jan-Ulrich; Langen, Hendrik; Baets, Jonathan; Bulk, Saskia; Darvish, Hossein; Bakhtiari, Somayeh; Kruer, Michael C.; Lim-Melia, Elizabeth; Aydinli, Nur; Alanay, Yasemin; El-Rashidy, Omnia; Nampoothiri, Sheela; Patel, Chirag; Beetz, Christian; Bauer, Peter; Yoon, Grace; Guillot, Mireille; Miller, Steven P.; Bourinaris, Thomas; Houlden, Henry; Robelin, Laura; Anheim, Mathieu; Alamri, Abdullah S.; Mahmoud, Adel A. H.; Inaloo, Soroor; Habibzadeh, Parham; Faghihi, Mohammad Ali; Jansen, Anna C.; Brock, Stefanie; Roubertie, Agathe; Darras, Basil T.; Agrawal, Pankaj B.; Santorelli, Filippo M.; Gleeson, Joseph; Zaki, Maha S.; Sheikh I, Sarah; Bennett, James T.; Sahin, Mustafa
    Bi-allelic loss-of-function variants in genes that encode subunits of the adaptor protein complex 4 (AP-4) lead to prototypical yet poorly understood forms of childhood-onset and complex hereditary spastic paraplegia: SPG47 (AP4B1), SPG50 (AP4M1), SPG51 (AP4E1) and SPG52 (AP4S1). Here, we report a detailed cross-sectional analysis of clinical, imaging and molecular data of 156 patients from 101 families. Enrolled patients were of diverse ethnic backgrounds and covered a wide age range (1.0-49.3 years). While the mean age at symptom onset was 0.8 +/- 0.6 years {[}standard deviation (SD), range 0.2-5.0], the mean age at diagnosis was 10.2 +/- 8.5 years (SD, range 0.1-46.3). We define a set of core features: early-onset developmental delay with delayed motor milestones and significant speech delay (50\% non-verbal)
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    Successful application of genome sequencing in a diagnostic setting: 1007 index cases from a clinically heterogeneous cohort
    (SPRINGERNATURE, 2021-01-01) Bertoli-Avella, Aida M.; Beetz, Christian; Ameziane, Najim; Rocha, Maria Eugenia; Guatibonza, Pilar; Pereira, Catarina; Calvo, Maria; Herrera-Ordonez, Natalia; Segura-Castel, Monica; Diego-Alvarez, Dan; Zawada, Michal; Kandaswamy, Krishna K.; Werber, Martin; Paknia, Omid; Zielske, Susan; Ugrinovski, Dimitar; Warnack, Gitte; Kampe, Kapil; Iurascu, Marius-Ionut; Cozma, Claudia; Vogel, Florian; Alhashem, Amal; Hertecant, Jozef; Al-Shamsi, Aisha M.; Alswaid, Abdulrahman Faiz; Eyaid, Wafaa; Al Mutairi, Fuad; Alfares, Ahmed; Albalwi, Mohammed A.; Alfadhel, Majid; Al-Sannaa, Nouriya Abbas; Reardon, Willie; Alanay, Yasemin; Rolfs, Arndt; Bauer, Peter
    Despite clear technical superiority of genome sequencing (GS) over other diagnostic methods such as exome sequencing (ES), few studies are available regarding the advantages of its clinical application. We analyzed 1007 consecutive index cases for whom GS was performed in a diagnostic setting over a 2-year period. We reported pathogenic and likely pathogenic (P/LP) variants that explain the patients' phenotype in 212 of the 1007 cases (21.1\%). In 245 additional cases (24.3\%), a variant of unknown significance (VUS) related to the phenotype was reported. We especially investigated patients which had had ES with no genetic diagnosis (n = 358). For this group, GS diagnostic yield was 14.5\% (52 patients with P/LP out of 358). GS should be especially indicated for ES-negative cases since up to 29.6\% of them could benefit from GS testing (14.5\% with P/LP, n = 52 and 15.1\% with VUS, n = 54). Genetic diagnoses in most of the ES-negative/GS-positive cases were determined by technical superiority of GS, i.e., access to noncoding regions and more uniform coverage. Importantly, we reported 79 noncoding variants, of which, 41 variants were classified as P/LP. Interpretation of noncoding variants remains challenging, and in many cases, complementary methods based on direct enzyme assessment, biomarker testing and RNA analysis are needed for variant classification and diagnosis. We present the largest cohort of patients with GS performed in a clinical setting to date. The results of this study should direct the decision for GS as standard second-line, or even first-line stand-alone test.