A national ecosystem for long-read genome sequencing: Integrating population genomics and rare disease diagnostics in Sweden

First-line long-read genome sequencing, backed by a national long-read population reference

This Swedish work brings together two initiatives: Genome of Sweden, the national contribution to Genome of Europe, whose first release of 576 individuals provides population-scale maps of genetic and epigenetic variation, and the Genomic Medicine Sweden – Rare Diseases long-read pilot. Among 485 probands, 161 (33.2%) received a molecular diagnosis, with long-read genome sequencing adding clinical value in 40 (24.8% of diagnoses). As a first-line test, it could have avoided at least 42 follow-up analyses and an additional testing cycle in 7.2% of probands. The authors present this national ecosystem as a scalable model for other countries.

Synthesis written by Geno'X. For the full original abstract, please refer to the source publication.

A preprint not yet peer reviewed, but one of the first reports of a national implementation of long-read genome sequencing in rare disease diagnostics. The key figure, added value in a quarter of diagnoses, is not broken down by variant type in the abstract, and cost per sample is not reported. A long-read population reference is an often underestimated prerequisite: without matching allele frequencies, interpreting variants detected by long-read sequencing remains fragile.

Analysis by Dr Thibaut Benquey