Dr. Costain will discuss findings from systematically assessing rare canonical splice site variants in blood expressed genes in a cohort of individuals who underwent genome sequencing and RNA-seq. The team found that up to 1 in 4 variants may not cause loss-of-function, and that in silico predictions using established tools and published guidelines were often discordant with RNA-seq data.

Erin Thorpe Venti will present findings from an observational, retrospective analysis of 1,004 underserved individuals from 8 countries with suspected rare genetic disease who received clinical genome sequencing (cGS) through the iHope program, a philanthropic testing access program.

Dr. Gabrielle Lemire will discuss exome copy number variant (CNV) detection, analysis and classification on a cohort of 6,633 families with undiagnosed rare genetic disorders. With the resolution provided by exome sequencing, they identified a causative CNV in 2.6% of families and assessed CNV pathogenicity by applying an advanced classification approach.

Dr. Appelbaum will discuss findings from a series of focus groups with patients, clinicians, and IRB members on return of polygenic risk scores in research. Despite strong interest in such results, they found multiple barriers to their effective use to improve health.

Pengfei Liu will present on a novel workflow for rare disease diagnostics using RNA-seq. The workflow leverages patient cell transdifferentiation into induced neurons to improve molecular diagnostic yield of neurological genetic disorders.