Long-read sequencing in rare-disease diagnosis

Long reads can span repeats, structural variants and methylation patterns that are difficult to resolve with short-read sequencing.

A rare-disease cohort study evaluated long-read sequencing alongside short-read analysis and reported additional candidate and diagnostic variants in several families.

Long reads can preserve the order of sequence across repetitive regions, phase variants and provide information about some methylation patterns. These capabilities can reveal changes that are hard to call with shorter fragments.

The study does not imply that every unresolved diagnosis will be solved by long reads. Coverage, analysis pipelines, variant interpretation and access to confirmatory testing remain decisive.

STKEY note: diagnostic decisions belong to qualified clinical teams; this is a research summary.