Beyond the "Jewish panel": the importance of offering expanded carrier screening to the Ashkenazi Jewish population.

Objective: To assess whether or not the current American College of Obstetricians and Gynecologists (ACOG) recommendations regarding carrier screening are sufficiently robust in detecting mutations in the Ashkenazi Jewish (AJ) population.

Design: Cross-sectional study.

Setting: Outreach program at university community center.

Patients: Self-identified Jewish students, 18-24 years of age, interested in genetic carrier testing.

Interventions: Expanded carrier screening (ECS) with the use of a commercially available targeted genotyping panel including >700 mutations in 180 genes.

Main Outcome Measures: Gene mutations found in this population were grouped into three categories based on ACOG's 2017 committee opinion regarding carrier screening: category 1: the four commonly recommended genetic conditions known to be a risk for this population; category 2: 14 genetic disorders that should be considered for more comprehensive screening, including those of category 1; and category 3: the ECS panel, which includes category 2.

Results: A total of 81 students underwent screening and 36 (44.4%) were ascertained to be carriers of at least one mutation. A total of 45 mutations were identified, as 8 students were carriers for more than one condition. If testing were limited to category 1, 84% of the mutations would not have been identified, and if limited to category 2, 55% of mutations would have gone undetected.

Conclusions: Individuals of Ashkenazi Jewish descent are at significant risk for carrying a variety of single-gene mutations and therefore they should be offered panethnic ECS to increase the likelihood of detecting preventable disorders.