Harnessing rare variants in neuropsychiatric and neurodevelopment disorders-a Keystone Symposia report

Genomics of Suicidal Behaviors: What Can We Learn from Polygenic Scores?

Substantial evidence supports the role of genetic factors in suicide behaviors (SBs). The most recent and powered genome-wide association studies identified significant loci for suicide, suicide attempts, and suicide ideation. Nonetheless, more research is needed to fully understand its impact. A novel approach considering the genetic complexity of SBs is polygenic scores that, in conjunction with individual and environmental factors, may have promising results to inform suicide risk stratification. Communicating this information to patients and the open population may have ethical implications that need to be considered to avoid iatrogenic effects.

Neuropsychological assessment in rare pediatric neurogenetic disorders: considerations for cross-cultural clinical research

Neuropsychological assessment in rare neurodevelopmental disorders has provided clinicians and researchers with a more comprehensive view of natural history as well as opportunities for additional endpoints in treatment trials. While challenges to protocol development have been addressed in the literature, cultural considerations have been overly broad resulting in limited utility when including mixed international samples. Using experiences over the past five years with the development of ten different protocols for neurogenetic rare diseases, this paper presents further considerations for protocol development that are culturally sensitive to international samples. Recommendations are offered across areas including participants from multiple countries; cognitive, sensory and motor impairments; psychometrics; and assessment logistics. A neuropsychological assessment selection checklist that guides researchers and clinicians through considerations and a standard operating procedure that provides guidance on thinking through the assessment process are offered.

Genetic modifiers of rare variants in monogenic developmental disorder loci

Rare damaging variants in a large number of genes are known to cause monogenic developmental disorders (DDs) and have also been shown to cause milder subclinical phenotypes in population cohorts. Here, we show that carrying multiple (2-5) rare damaging variants across 599 dominant DD genes has an additive adverse effect on numerous cognitive and socioeconomic traits in UK Biobank, which can be partially counterbalanced by a higher educational attainment polygenic score (EA-PGS). Phenotypic deviators from expected EA-PGS could be partly explained by the enrichment or depletion of rare DD variants. Among carriers of rare DD variants, those with a DD-related clinical diagnosis had a substantially lower EA-PGS and more severe phenotype than those without a clinical diagnosis. Our results suggest that the overall burden of both rare and common variants can modify the expressivity of a phenotype, which may then influence whether an individual reaches the threshold for clinical disease.