RESUMEN
Understanding attitudes towards genetic exceptionalism and confidentiality is important in guiding policies regarding special protections for genetic/genomic information stored in electronic health records (EHR). The goals of this study were to determine biobank participants' attitudes towards genetic exceptionalism and confidentiality and whether those attitudes are related to their preference for return of genetic results. An online questionnaire was distributed to patients with an EHR and email address who had previously enrolled in the BioMe Biobank program. Most participants responded with similar levels of concern in scenarios involving the use of genetic information and other types of health information, suggesting that participants want similar protections for genetic data as other types of sensitive health information, particularly mental health and family history records. Of the 829 respondents, the majority had genetic exceptionalist views when directly asked, even though their concerns about confidentiality were similar for their genetic information and other health information. There were no differences in genetic exceptionalist views between those who had a documented preference to have genetic results returned and those who did not. Notably, for many participants, their recall of preference did not align with their documented preference. The majority of biobank participants were most anxious about the loss of confidentiality for genetic, mental health, and family history information, indicating that certain types of health information are considered more "sensitive" than others. These findings suggest the importance of assuring people participating in biobank research that the confidentiality of their "sensitive" health information is secured.
RESUMEN
Heterozygous missense variants and in-frame indels in SMC3 are a cause of Cornelia de Lange syndrome (CdLS), marked by intellectual disability, growth deficiency, and dysmorphism, via an apparent dominant-negative mechanism. However, the spectrum of manifestations associated with SMC3 loss-of-function variants has not been reported, leading to hypotheses of alternative phenotypes or even developmental lethality. We used matchmaking servers, patient registries, and other resources to identify individuals with heterozygous, predicted loss-of-function (pLoF) variants in SMC3, and analyzed population databases to characterize mutational intolerance in this gene. Here, we show that SMC3 behaves as an archetypal haploinsufficient gene: it is highly constrained against pLoF variants, strongly depleted for missense variants, and pLoF variants are associated with a range of developmental phenotypes. Among 14 individuals with SMC3 pLoF variants, phenotypes were variable but coalesced on low growth parameters, developmental delay/intellectual disability, and dysmorphism, reminiscent of atypical CdLS. Comparisons to individuals with SMC3 missense/in-frame indel variants demonstrated an overall milder presentation in pLoF carriers. Furthermore, several individuals harboring pLoF variants in SMC3 were nonpenetrant for growth, developmental, and/or dysmorphic features, and some had alternative symptomatologies with rational biological links to SMC3. Analyses of tumor and model system transcriptomic data and epigenetic data in a subset of cases suggest that SMC3 pLoF variants reduce SMC3 expression but do not strongly support clustering with functional genomic signatures of typical CdLS. Our finding of substantial population-scale LoF intolerance in concert with variable growth and developmental features in subjects with SMC3 pLoF variants expands the scope of cohesinopathies, informs on their allelic architecture, and suggests the existence of additional clearly LoF-constrained genes whose disease links will be confirmed only by multilayered genomic data paired with careful phenotyping.
