Hinweise zu Qualitätskriterien von Zeitschriften
Open-Access-Richtlinie der Helmholtz-Gemeinschaft 2016
CC Licencences
Metriken für Publikationen
Startseite
Login
English
Erweiterte Suche
Durchblättern nach ...
Publikationen im Überblick
HGF Fortschrittsbericht
OA Publikationen
Neue Publikation eintragen
Neue Publikation holen aus...
Fehlende Publikation melden
Ansprechpartner
Hilfe
Bibliometrische Indikatoren
Text
Endnote (RIS)
BibTeX
Postprint
Forschungsdaten
DOI
PMC
 |
Open Access Green |
möglich sobald bei der ZB eingereicht worden ist.
Repeat-associated ataxias in a German patient cohort analysed by targeted parallel long-read sequencing.
Brain:awaf318 (2025)
Postprint
Forschungsdaten
DOI
PMC
Hereditary adult-onset ataxias are a heterogeneous group of phenotypically overlapping conditions, often caused by pathogenic expansions of short tandem repeats. Currently, 18 repeat disorders with a core phenotype of adult-onset ataxia are known. Diagnosis typically relies on sequential PCR-based methods, which are labour-intensive and lack precision. Long-read sequencing (LRS) has the potential to overcome these limitations and is currently implemented and validated in clinical genetics. Using clinical nanopore Cas9-targeted sequencing (Clin-CATS) for parallel in-depth repeat analysis, we evaluated a diagnostic cohort of 513 adult-onset ataxia patients, determining frequencies of all known repeat-associated ataxias except Spinocerebellar ataxia 4 (SCA4), as well as the carrier frequencies for autosomal-recessive disorders, RFC1 spectrum disorder and Friedreich's ataxia (FRDA). Additionally, phenotypes of patients with established genetic diagnoses were characterized, especially those of patients living with RFC1 spectrum disorder and SCA27B. Repeat-associated ataxias were confirmed in 33.3% of cases, including rare ataxias, such as SCA10, SCA36 and SCA37, alongside as the most prevalent conditions SCA27B and RFC1 spectrum disorder. Potentially pathogenic expansions in FGF14 were identified in an additional 4.7% of patients. Testing of another 347 patients for ZFHX3 expansions linked to SCA4 did not identify any cases. Dual diagnoses were frequent, occuring in 6.4% of patients with repeat-associated ataxia. We confirmed a high RFC1 spectrum disorder carrier frequency (7.2%) and reclassified certain FXN expansions as likely non-pathogenic, resulting in a lower than estimated carrier frequency for FRDA of 0.8%. We also identified novel repeat configurations in several loci and illustrated the high heterogeneity of repeat expansions in RFC1, highlighting it as a potential source of false results when using PCR-based methods. This study underscores the diagnostic advantages of LRS for comprehensive repeat analysis and recommends its adoption as a standard in clinical genetics, replacing Southern blot and PCR-based approaches. Furthermore, based on our findings in a large patient cohort a re-evaluation of existing phenotype-genotype correlations is recommended as well as evaluating additional parameters besides repeat length to improve diagnostic precision of repeat analysis.
Impact Factor
Scopus SNIP
Altmetric
11.700
0.000
Anmerkungen
Besondere Publikation
Auf Hompepage verbergern
Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Schlagwörter
Rfc1 ; Hereditary Ataxia ; Long-read Sequencing ; Repeat Analysis ; Repeat Expansion Disorders
Sprache
englisch
Veröffentlichungsjahr
2025
HGF-Berichtsjahr
2025
ISSN (print) / ISBN
0006-8950
e-ISSN
1460-2156
Zeitschrift
Brain: A Journal of Neurology
Quellenangaben
Artikelnummer: awaf318
Verlag
Oxford University Press
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute of Neurogenomics (ING)
POF Topic(s)
30205 - Bioengineering and Digital Health
Forschungsfeld(er)
Genetics and Epidemiology
PSP-Element(e)
G-503200-001
PubMed ID
40898875
Erfassungsdatum
2025-10-17