Ethical issues in genomics research in persons with Alzheimer's Disease/Alzheimer's Disease-related dementia (AD/ADRD): a systematic review.

Introduction: Given the growing number of Alzheimer's Disease and Alzheimer's Disease Related Dementias (AD/ADRD) genomics research projects and the vulnerabilities of study participants, it is critical to evaluate the literature on the ethical challenges in such studies to ensure high ethical standards.

Methods: We conducted a systematic review of the literature on ethical issues in AD/ADRD genomics research. We searched Embase, PsycINFO, CiNAHL, Scopus, and Ovid Medline for empirical and normative papers published in peer-reviewed journals on the ethical issues involved in conducting genomics research among persons with AD/ADRD. We used ethical principles from an existing framework as a priori codes to categorize the ethical issues and adapted another framework of Dementia Research Ethical Issues (DREI) as subcategories for our synthesis. We used the 2021 PRISMA guidelines to guide our study.

Results: We screened 5,509 papers and included 27 of these papers in the systematic review after deduplication, title, and full-text review. The papers contained 109 ethical issues that were mapped against 42 out of 75 relevant DREIs. The highest number of DREIs were mapped to "respect for persons and communities", "favorable risk-benefit ratio", "informed consent" and "scientific validity". The least mapped principles to the DREIs were "fair participant selection", "independent review", "social value", and "collaborative partnership".

Conclusion: Our review showed that there is a dearth of literature on the ethical principles of "fair participant selection", "independent review", "social value" and "collaborative partnership" in genomics research on AD/ADRDs. It is difficult to draw firm conclusions from the distribution of attention paid to specific principles because these may only reflect the concerns of AD/ADRD genomics research ethicists in high-income countries. There is need for more research on the ethics of AD/ADRD genomics research in low and middle-income countries for a more balanced account of the important ethical considerations in this field.