Parallel in-depth analysis of repeat expansions: an updated Clin-CATS workflow for nanopore R10 flow cells
Scholz, V.; Schoenrock, V.; Erdmann, H.; Prokosch, V.; Schoedel, M.; Almus, M.; Sauer, M.; Mayer, V.; Breithausen, E.; van Buren, I.; Dineiger, C.; Heintz, C.; Hallermayr, A.; Neuhann, T.; Holinski-Feder, E.; Abicht, A.; Benet-Pages, A.; Lucas, M. C.
Show abstract
Hereditary ataxias, caused by expansions of short tandem repeats, are difficult to diagnose using traditional PCR and Southern blot methods, which struggle to detect complex repeat expansions and cannot assess repeat interruptions or methylation. We present an updated Clinical Nanopore Cas9-Targeted Sequencing (Clin-CATS) workflow for analyzing repeat expansions, now compatible with the Oxford Nanopore Technologies R10 flow cell. The workflow incorporates the ONT wf-human-variation Epi2Me workflow, including the Straglr tool to analyze basecalled reads, ensuring compatibility with past, current, and future sequencing chemistries. It expands the number of genes analyzed from 10 to 27 within the ataxia panel and introduces new gene panels for myopathy, neurodegeneration, and ALS/motor neuron disease. Validated with Coriell reference and clinical samples, this method improves the analysis of pathogenic repeat expansions, providing deeper insights into repeat structures while addressing the limitations of traditional approaches.
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