Variant reporting
We have long known that databases and registries in the United States have an increased representation of individuals from European ancestries.5,6 However, there have been limited conversations about how the lack of representation within our databases and registries leads to inequities in guidelines and the care that we provide to patients. As a result, studies have shown higher rates of variants of uncertain significance (VUS) identified during genetic testing in non-White individuals than in Whites.16 When it comes to reporting of variants, carrier screening laboratories follow guidelines set forth by the ACMG, and most laboratories only report likely pathogenic or pathogenic variants.17 It is unknown how the higher rate of VUSs in the non-White population, and lack of data and representation in databases and software used to calculate predicted phenotype, impacts identification of at-risk carrier couples in these underrepresented populations. It is imperative that we increase knowledge and representation of variants across ethnicities to improve sensitivity and specificity across the population and not just for those of European descent.
Moving forward
Being aware of social- and race-based biases in carrier screening is important, but modifying structural systems to increase representation, access, and utility of carrier screening is a critical next step. Organizations like ACOG and ACMG have committed not only to understanding but also to addressing factors that have led to disparities and inequities in health care delivery and access.18,19 Actionable steps include offering a universal carrier screening program to all preconception and prenatal patients that addresses conditions with increased carrier frequency, in any population, defined as severe and moderate phenotype with established natural history.3,4 Educational materials should be provided to detail risks, benefits, and limitations of carrier screening, as well as shared decision making between patient and provider to align the patient’s wishes for the information provided by carrier screening.
A broader number of conditions offered through carrier screening will increase the likelihood of positive carrier results. The increase in carriers identified should be viewed as more accurate reproductive risk assessment in the context of equitable care, rather than justification for panels to be limited to specific ancestries. Simultaneous or tandem reproductive partner or donor testing can be considered to reduce clinical workload and time for results return.
In addition, increased representation of individuals who are from diverse ancestries in promotional and educational resources can reinforce that risk for Mendelian conditions is not specific to single ancestries or for targeted conditions. Future research should be conducted to examine the role of racial disparities related to carrier screening and greater inclusion and recruitment of diverse populations in data sets and research studies.
Learned biases toward race, religion, gender identity, sexual orientation, and economic status in the context of carrier screening should be examined and challenged to increase access for all patients who may benefit from this testing. For example, the use of gendered language within carrier screening guidelines and policies and how such screening is offered to patients should be examined. Guidelines do not specify what to do when someone is adopted, for instance, or does not know their ethnicity. It is important that, as genomic testing becomes more available, individuals and groups are not left behind and existing gaps are not further widened. Assessing for genetic variation that modifies for disease or treatment will be more powerful than stratifying based on race. Carrier screening panels should be comprehensive regardless of ancestry to ensure coverage for global genetic variation and to increase access for all patients to risk assessments that promote informed reproductive decision making.
Health equity requires unlearning certain behaviors
As clinicians we all have a commitment to educate and empower one another to offer care that helps promote health equity. Equitable care requires us to look at the current gaps and figure out what programs and initiatives need to be designed to address those gaps. Carrier screening is one such area in which we can work together to improve the overall care that our patients receive, but it is imperative that we examine our practices and unlearn behaviors that contribute to existing disparities. ●