Multi-gene testing in neurological disorders showed an improved diagnostic yield: data from over 1000 Indian patients

Aparna Ganapathy,Avshesh Mishra, Megha Rani Soni, Priyanka Kumar, Mukunth Sadagopan,Anil Vittal Kanthi, Irene Rosetta Pia Patric, Sobha George,Aparajit Sridharan, T. C. Thyagarajan, S. L. Aswathy, H. K. Vidya, Swathi M. Chinnappa, Swetha Nayanala, Manasa B. Prakash, Vijayashree G. Raghavendrachar,Minothi Parulekar,Vykuntaraju K. Gowda,Sheela Nampoothiri,Ramshekhar N. Menon,Divya Pachat,Vrajesh Udani,Neeta Naik,Mahesh Kamate,A. Radha Rama Devi,P. A. Mohammed Kunju,Mohandas Nair, Anaita Udwadia Hegde, M. Pradeep Kumar,Soumya Sundaram,Preetha Tilak,Ratna D. Puri, Krati Shah, Jayesh Sheth,Qurratulain Hasan, Frenny Sheth,Pooja Agrawal,Shanmukh Katragadda,Vamsi Veeramachaneni,Vijay Chandru,Ramesh Hariharan,Ashraf U. Mannan

Journal of Neurology(2019)

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摘要
Background Neurological disorders are clinically heterogeneous group of disorders and are major causes of disability and death. Several of these disorders are caused due to genetic aberration. A precise and confirmatory diagnosis in the patients in a timely manner is essential for appropriate therapeutic and management strategies. Due to the complexity of the clinical presentations across various neurological disorders, arriving at an accurate diagnosis remains a challenge. Methods We sequenced 1012 unrelated patients from India with suspected neurological disorders, using TruSight One panel. Genetic variations were identified using the Strand NGS software and interpreted using the StrandOmics platform. Results We were able to detect mutations in 197 genes in 405 (40%) cases and 178 mutations were novel. The highest diagnostic rate was observed among patients with muscular dystrophy (64%) followed by leukodystrophy and ataxia (43%, each). In our cohort, 26% of the patients who received definitive diagnosis were primarily referred with complex neurological phenotypes with no suggestive diagnosis. In terms of mutations types, 62.8% were truncating and in addition, 13.4% were structural variants, which are also likely to cause loss of function. Conclusion In our study, we observed an improved performance of multi-gene panel testing, with an overall diagnostic yield of 40%. Furthermore, we show that NGS (next-generation sequencing)-based testing is comprehensive and can detect all types of variants including structural variants. It can be considered as a single-platform genetic test for neurological disorders that can provide a swift and definitive diagnosis in a cost-effective manner.
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关键词
Neurological disorders, Genetic testing, Next-generation sequencing, Multi-gene panel
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