A closer look at expanded carrier screening from a PGD perspective.

Area of Science:

• Reproductive Genetics
• Genetic Screening
• Genomics

Background:

• Traditional carrier screening relied on ethnicity and family history for limited genetic conditions.
• Expanded carrier screening now utilizes broad genetic panels for hundreds of disorders.
• The goal is to enhance reproductive autonomy through preconception knowledge and options like PGD.

Purpose of the Study:

• To highlight challenges and limitations associated with expanded carrier screening.
• To inform patients and stakeholders about potential issues with PGD eligibility and result interpretation.
• To prompt a reevaluation of embryo testing and prioritization strategies in light of comprehensive screening.

Main Methods:

• Review of current practices and implications of expanded carrier screening panels.
• Analysis of potential limitations concerning PGD eligibility with heterogeneous conditions.
• Discussion of challenges arising from variants of uncertain significance and comprehensive carrier identification.

Main Results:

• Expanded panels may not guarantee PGD eligibility due to condition heterogeneity.
• Lack of family history in panel-identified couples necessitates new considerations for PGD.
• Increased incidence of complex genetic profiles (e.g., carrier + variant of uncertain significance) requires PGD discussion.
• Comprehensive screening necessitates reassessment of embryo testing and prioritization.

Conclusions:

• Patients must be informed about potential limitations of expanded carrier screening before testing.
• The interpretation of results, especially concerning PGD, requires careful consideration of individual circumstances.
• Stakeholders need to be aware of the challenges and limitations associated with positive results from expanded carrier screening panels.