J 2020

Monogenic variants in dystonia: an exome-wide sequencing study

ZECH, M., R. JECH, S. BOESCH, M. SKORVANEK, S. WEBER et. al.

Basic information

Original name

Monogenic variants in dystonia: an exome-wide sequencing study

Authors

ZECH, M., R. JECH, S. BOESCH, M. SKORVANEK, S. WEBER, M. WAGNER, C. ZHAO, A. JOCHIM, J. NECPAL, Y. DINCER, K. VILL, F. DISTEIMAIER, M. STOKLOSA, M. KRENN, S. GRUNWALD, T. BOCK-BIERBAUM, A. FECIKOVA, P. HAVRANKOVA, J. ROTH, I. PRIHODOVA, M. ADAMOVICOVA, O. ULMANOVA, K. BECHYNE, Pavlína DANHOFER (203 Czech Republic, belonging to the institution), B. VESELY, V. HAN, P. PAVELEKOVA, Z. GDOVINOVA, T. MANTEL, T. MEINDL, A. SITZBERGER, S. SCHRODER, A. BLASCHEK, T. ROSER, M. BONFERT, E. HABERLANDT, B. PLECKO, B. LEINEWEBER, S. BERWECK, T. HERBERHOLD, B. LANGGUTH, J. SVANTNEROVA, M. MINAR, G. A. RAMOS-RIVERA, M. H. WOJCIK, S. PAJUSALU, K. OUNAP, U. A. SCHATZ, L. POLSLER, I. MILENKOVIC, F. LACCONE, V. PILHOFER, R. COLOMBO, S. PATZER, A. IUSO, J. VERA, M. TRONCOSO, F. FANG, H. PROKISCH, F. WILBERT, M. ECKENWEILER, E. GRAF, D. S. WESTPHAL, K. M. RIEDHAMMER, T. BRUNET, B. ALHADDAD, R. BERUTTI, T. M. STROM, M. HECHT, M. BAUMANN, M. WOLF, A. TELEGRAFI, R. E. PERSON, F. M. ZAMORA, L. B. HENDERSON, D. WEISE, T. MUSACCHIO, J. VOLKMANN, A. SZUTO, J. BECKER, K. CREMER, T. SYCHA, F. ZIMPRICH, V. KRAUS, C. MAKOWSKI, P. GONZALEZ-ALEGRE, T. M. BARDAKJIAN, L. J. OZELIUS, A. VETRO, R. GUERRINI, E. MAIER, I. BORGGRAEFE, A. KUSTER, S. B. WORTMANN, A. HACKENBERG, R. STEINFELD, B. ASSMANN, C. STAUFNER, T. OPLADEN, E. RUZICKA, R. D. COHN, D. DYMENT, W. K. CHUNG, H. ENGELS, A. CEBALLOS-BAUMANN, R. PLOSKI, O. DAUMKE, B. HASLINGER, V. MALL, K. OEXLE and J. WINKEHNANN (guarantor)

Edition

Lancet Neurology, London, UK, Elsevier, 2020, 1474-4422

Other information

Language

English

Type of outcome

Článek v odborném periodiku

Field of Study

30103 Neurosciences

Country of publisher

United States of America

Confidentiality degree

není předmětem státního či obchodního tajemství

References:

Impact factor

Impact factor: 44.182

RIV identification code

RIV/00216224:14110/20:00117064

Organization unit

Faculty of Medicine

UT WoS

000581121200023

Keywords in English

dystonia; monogenic variants

Tags

Tags

International impact, Reviewed
Změněno: 7/2/2022 10:12, Mgr. Tereza Miškechová

Abstract

V originále

Background Dystonia is a clinically and genetically heterogeneous condition that occurs in isolation (isolated dystonia), in combination with other movement disorders (combined dystonia), or in the context of multisymptomatic phenotypes (isolated or combined dystonia with other neurological involvement). However, our understanding of its aetiology is still incomplete. We aimed to elucidate the monogenic causes for the major clinical categories of dystonia. Methods For this exome-wide sequencing study, study participants were identified at 33 movement-disorder and neuropaediatric specialty centres in Austria, Czech Republic, France, Germany, Poland, Slovakia, and Switzerland. Each individual with dystonia was diagnosed in accordance with the dystonia consensus definition. Index cases were eligible for this study if they had no previous genetic diagnosis and no indication of an acquired cause of their illness. The second criterion was not applied to a subset of participants with a working clinical diagnosis of dystonic cerebral palsy. Genomic DNA was extracted from blood of participants and whole-exome sequenced. To find causative variants in known disorder-associated genes, all variants were filtered, and unreported variants were classified according to American College of Medical Genetics and Genomics guidelines. All considered variants were reviewed in expert round-table sessions to validate their clinical significance. Variants that survived filtering and interpretation procedures were defined as diagnostic variants. In the cases that went undiagnosed, candidate dystonia-causing genes were prioritised in a stepwise workflow. Findings We sequenced the exomes of 764 individuals with dystonia and 346 healthy parents who were recruited between June 1, 2015, and July 31, 2019. We identified causative or probable causative variants in 135 (19%) of 728 families, involving 78 distinct monogenic disorders. We observed a larger proportion of individuals with diagnostic variants in those with dystonia (either isolated or combined) with coexisting non-movement disorder-related neurological symptoms (100 [45%] of 222; excepting cases with evidence of perinatal brain injury) than in those with combined (19 [19%] of 98) or isolated (16 [4%] of 388) dystonia. Across all categories of dystonia, 104 (65%) of the 160 detected variants affected genes which are associated with neurodevelopmental disorders. We found diagnostic variants in 11 genes not previously linked to dystonia, and propose a predictive clinical score that could guide the implementation of exome sequencing in routine diagnostics. In cases without perinatal sentinel events, genomic alterations contributed substantively to the diagnosis of dystonic cerebral palsy. In 15 families, we delineated 12 candidate genes. These include IMPDH2, encoding a key purine biosynthetic enzyme, for which robust evidence existed for its involvement in a neurodevelopmental disorder with dystonia. We identified six variants in IMPDH2, collected from four independent cohorts, that were predicted to be deleterious de-novo variants and expected to result in deregulation of purine metabolism. Interpretation In this study, we have determined the role of monogenic variants across the range of dystonic disorders, providing guidance for the introduction of personalised care strategies and fostering follow-up pathophysiological explorations.

Links

ROZV/28/LF6/2020, interní kód MU
Name: Etiopatogeneze poruch autistického spektra (PAS): genetické a neuroimunologické aspekty
Investor: Ministry of Education, Youth and Sports of the CR, Internal development projects