Abstract:
OBJECTIVE:We aimed to investigate the prevalence of TOR1A, GNAL and THAP1 variants as the cause of dystonia in a cohort of Spanish patients with isolated dystonia and in the literature. METHODS:A population of 2028 subjects (including 1053 patients with different subtypes of isolated dystonia and 975 healthy controls) from southern and central Spain was included. The genes TOR1A, THAP1 and GNAL were screened using a combination of high-resolution melting analysis and direct DNA resequencing. In addition, an extensive literature search to identify original articles (published before 10 August 2020) reporting mutations in TOR1A, THAP1 or GNAL associated to dystonia was performed. RESULTS:Pathogenic or likely pathogenic variants in TOR1A, THAP1 and GNAL were identified in 0.48%, 0.57% and 0.29% of our patients, respectively. Five patients carried the variation p.Glu303del in TOR1A. A very rare variant in GNAL (p.Ser238Asn) was found as a putative risk factor for dystonia. In the literature, variations in TOR1A, THAP1 and GNAL accounted for about 6%, 1.8% and 1.1% of published dystonia patients, respectively. CONCLUSIONS:There is a different genetic contribution to dystonia of these three genes in our patients (about 1.3% of patients) and in the literature (about 3.6% of patients), probably due the high proportion of adult-onset cases in our cohort. As regards age at onset, site of dystonia onset, and final distribution, in our population there is a clear differentiation between DYT-TOR1A and DYT-GNAL, with DYT-THAP1 likely to be an intermediate phenotype.
journal_name
Eur J Neuroljournal_title
European journal of neurologyauthors
Gómez-Garre P,Jesús S,Periñán MT,Adarmes A,Alonso-Canovas A,Blanco-Ollero A,Buiza-Rueda D,Carrillo F,Catalán-Alonso MJ,Del Val J,Escamilla-Sevilla F,Espinosa-Rosso R,Fernández-Moreno MC,García-Moreno JM,García-Ruiz PJ,Giacodoi
10.1111/ene.14638subject
Has Abstractpub_date
2020-11-11 00:00:00eissn
1351-5101issn
1468-1331pub_type
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