Publications

Date Revised: October 2024

Thank you to all the families for participating in Simons Searchlight. Through your involvement, we aim to assist researchers and geneticists worldwide in understanding genetic disorders affecting you or your family.

The research conducted using Simons Searchlight data has resulted in numerous published papers. These papers undergo a peer-review process, where other scientists assess and validate the research before publication in scientific journals. Additionally, some findings are shared via preprints, allowing rapid dissemination of information to the scientific community.

Many of the publications feature the name “Simons Variation in Individuals Project” (SimonsVIP), which was the original name of our research program, now known as Simons Searchlight.

The listed articles are organized chronologically, from oldest to newest. You can explore publications by specific genetic conditions using the categories below.

As of October 2024, Simons Searchlight has contributed to 108 publications and preprints, and we will continue to summarize new publications.

For accessibility, the Simons Foundation encourages researchers to make their publications open access. If you cannot access a journal article, we recommend reaching out to the last author listed on the paper to request a copy.

Understanding Publication Reference Titles:

-The article title is followed by publication details, including where and when it was published.
– If there are more than three authors, we use “et al.” to represent additional contributors.
– Journals are referenced using shorthand names.

Disclaimer: Please be aware that papers posted on medRxiv (pronounced med-archive) or bioRxiv (pronounced bio-archive) are not peer-reviewed or edited before online publication. In contrast, all other articles listed here have undergone review by fellow researchers to ensure quality and accuracy. While posting on medRxiv or bioRxiv allows researchers to share findings quickly, the final published results may differ after undergoing formal peer review for journal publication.

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Genetic Condition
Year of Publication
108 Publications
Absence seizures and sleep abnormalities in a rat model of GRIN2B neurodevelopmental disorder
  • This study looked at the role of GRIN2B-related syndrome on the sleep-wake cycle in a rat animal model.Show More
  • The researchers did not use Simons Searchlight data in their analysis, but they referenced learnings from a 2021 Simons Searchlight registry report on sleep for the GRIN2B community. The researchers cite the report as important background information on sleep in people with GRIN2B-related syndrome. Sleep is often dysfunctional, and many people struggle with falling and staying asleep, and have breathing irregularities during sleep.
  • The researchers found that the GRIN2B rat had dysfunctional sleep patterns, and may be a potential animal model of the disorder for pre-clinical studies.Show Less
bioRxiv Preprint, (2024)
Hristova et al.
Full Article

GRIN2B
2024

Beyond the diagnosis: Evaluation of quality-of-life measures and family functioning in SLC6A1 related neurodevelopmental disorder
  • The researchers studied parent-reported quality of life (QOL) measures to determine a baseline for quality of life in preparation for a future clinical trial. Creating a baseline, or starting point, for quality of life is important when there are clinical trials that improve the quality of life of the person and their family.Show More
  • Simons Searchlight quality of life data from 32 participants was used in combination with the authors’ clinical trial readiness study quality of life data from 20 participants. These data were used to characterize the QOL for the SLC6A1-related neurodevelopmental disorder (SLC6A1-NDD) community. This is the first study to define the QOL for people with SLC6A1-NDD and their families.
  • The researchers used different surveys to capture QOL: 1) Quality of Life Inventory-Disability, a survey that is well studied for people with intellectual disability; 2) PedsQL Family Impact Module, a survey that aims to determine the effect of the person’s diagnosis on the family; and 3) Quality of Life Childhood Epilepsy survey, which is used to determine the effect of epilepsy on people experiencing seizures and intellectual disability.
  • The researchers found that in general, the total scores for Quality of Life Inventory-Disability were higher than PedsQL Family Impact Module scores and Quality of Life Childhood Epilepsy survey scores. Higher scores indicated a higher QOL. The lowest domains within the QOL surveys were Physical Ability and Negative Emotions, and the highest domains were Social and Positive Emotions.
  • The researchers were careful in their interpretations of these results, as stronger conclusions will require studying more individuals. The researchers think that they have generated QOL reference ranges for people with SLC61A-NDD.Show Less
Pediatr Neurol 155, 160-166 (2024)
Dahshi et al.
Full Article

SLC6A1
2024

Improvement of variant reclassification in genetic neurodevelopmental conditions
  • When a person receives genetic testing, the medical community has to interpret the genetic variants found. This interpretation includes a ranking of whether the variant causes an issue for the person, from problematic to not problematic. This includes the following categories: Pathogenic, Likely Pathogenic, Variant of Uncertain Significance (VUS), Likely Benign, and Benign. A VUS is not a genetic diagnosis, but it indicates that a variant needs more information to determine a genetic diagnosis.Show More
  • This research article reviews genetic variant reinterpretation for all the variants in Simons Searchlight up to December 2022. To our knowledge, this is the only international research registry of its kind that is performing a detailed review of genetic laboratory results across genetic neurodevelopmental conditions. In this study, Simons Searchlight found that in general, genetic variants are more often upgraded to likely pathogenic or pathogenic.
  • Some of the reasons we would like to highlight how a VUS was upgraded to likely pathogenic or pathogenic within our database are: 1) the variant was not found in either parent (this helped in reclassification of 32.3 percent of participants); 2) Simons Searchlight collects genetic testing reports internationally (this led to 18.0 percent of upgrades due to rare variants being submitted multiple times to the registry).
  • We looked at self-reported race/ethnicity information and our data suggested that White participants submitted VUS at a lower frequency than participants of other races and ethnicities. In addition, participants of other races and ethnicities were less likely to have a VUS that was reclassified. Because fewer people of color are included in the genetic sequencing data, it is difficult for the genetics community to interpret variants.
  • A comparison between ClinVar, another international genetic database, and Simons Searchlight VUS reclassifications for SCN2A, SLC6A1, and STXBP1 demonstrated that Simons Searchlight reclassifies variants at a significantly higher rate than those variants submitted to ClinVar alone.Show Less
GIM Open 2, 101845 (2024)
Kowanda et al.
Full Article

All Genes
2024

Association of behavioural and social–communicative profiles in children with 16p11.2 copy number variants: A multi-site study
  • In this study, the researchers aimed to identify the differences and associations of behavioural and social–communicative features of children with 16p11.2 deletion syndrome and 16p11.2 duplication.Show More
  • The researchers studied Simons Searchlight participants: 23 with 16p11.2 deletion and 10 with 16p11.2 duplication. They also studied participants from the Netherlands: 24 with 16p11.2 deletion and 11 with 16p11.2 duplication.
  • The researchers found that people with 16p11.2 deletion and 16p11.2 duplication had similar scores on the Full-Scale Intelligence Quotient (FSIQ), which is a scale for a person’s cognitive capacity. They found that FSIQ scores were lower than average for these participants, but the researchers suggested that because the group of people were identified by clinical symptoms, this might skew the FSIQ scores.
  • Participants with 16p11.2 deletion had behavior issues 52 percent of the time. Participants who were 16p11.2 duplication carriers had behavior issues 89 percent of the time. Not all people with 16p11.2 deletion or duplication met the criteria for an autism diagnosis, but almost everyone had features of autism, and most people had delayed speech and language milestones that required speech therapy. Difficulty with the use of context in communication was observed in 93 percent of 16p11.2 duplication carriers and 77 percent of 16p11.2 deletion carriers.
  • Participants with a 16p11.2 duplication had more issues with social responsiveness, such as more difficulty with interpersonal activities and stereotypic behaviors related to autism. Withdrawn and depressed behaviors were more often reported for people with 16p11.2 deletion.Show Less
J Intellect Disabil Res Epub ahead of print, (2024)
Verbesselt et al.
Full Article

16p11.2 deletion
16p11.2 duplication
2024

Discovering the gene-brain-behavior link in autism via generative machine learning
  • The researchers used machine learning to study how brain mass is distributed and how it changes. This technique allowed the researchers to examine cell movement, organization, and cell changes in the brain. The researchers hypothesized that machine learning could detect more subtle changes in the brain than the human eye.Show More
  • The researchers studied brain images from Simons Searchlight participants, including 48 with 16p11.2 deletion and 40 who were 16p11.2 duplication carriers. The researchers also studied 118 people with no genetic conditions.
  • The researchers found that genetic cohorts are more unique based on white matter distribution (parts that look white on brain imaging and are involved in transmitting brain signals) than gray matter distribution (parts that appear gray on brain imaging and are involved in receiving brain signals).
  • The researchers suggested that nearly everyone with a deletion or duplication had detectable brain structure changes. Consistent with other research, the researchers found that people with 16p11.2 deletions have tissue overgrowth and people with 16p11.2 duplications have tissue undergrowth. With issues in brain areas associated with processing emotions, abilities to perceive visible space in their environment, ability to handle multiple sensory inputs, and language.
  • The researchers used three-dimensional (3D) transport-based morphometry (TBM) to assign scores to specific medical features in people with 16p11.2 deletion or duplication syndrome.
  • A negative TBM score in gray or white matter was associated with having an articulation disorder (an inability to make speech sounds).
  • The researchers suggested that certain common changes in the brain matter of the cerebral cortex of 16p11.2 deletion carriers or duplication carriers were linked to IQ levels. The cerebral cortex is the outer layer of the human brain.
  • This research was supported by a grant from the Simons Foundation Autism Research Initiative (SFARI).Show Less
Sci Adv 10, eadl5307 (2024)
Kundu et al.
Full Article

16p11.2 deletion
16p11.2 duplication
2024

Nav1.2 channel mutations preventing fast inactivation lead to SCN2A encephalopathy
  • Genetic variants in SCN2A-related syndrome result in a gain of function, a loss of function, or a mixed function of the SCN2A protein. It is not always obvious how a change in the SCN2A gene will affect the SCN2A protein. To better understand this requires testing in the research laboratory.Show More
  • Researchers tested different SCN2A genetic variants to learn how they would affect the SCN2A protein, called the Nav1.2 channel. Variants that affect protein function can result in abnormal brain cell activity.
  • The researchers used some SCN2A data from Simons Searchlight.
  • The researchers studied the following missense variants: p.Asn1662Asp, p.Leu1657Pro, p.Pro1658Ser, p.Ala1659Val, p.Phe1651Cys, p.Met1501Val, and p.Met1501Thr.
  • The researchers found that the p.Pro1658Ser, p.Ala1659Val, p.Phe1651Cys, p.Met1501Val, and p.Met1501Thr variants resulted in a gain of function SCN2A protein and over excitability of the Nav1.2 channel.
  • Variants p.Asn1662Asp and p.Leu1657Pro caused a Nav1.2 channel that could not be turned off, resulting in the early-infantile developmental and epileptic encephalopathy medical features associated with a gain of function.
  • The researchers suggested that their method is better at detecting the subtle variant differences in SCN2A as compared with other techniques. Importantly, other techniques might conclude that p.Asn1662Asp and p.Leu1657Pro are loss of function variants.Show Less
Brain Awae213, (2024)
Berecki et al.
Full Article

SCN2A
2024

Motor difficulties in 16p11.2 copy number variation
  • The researchers studied the differences in motor abilities in people with 16p11.2 deletions and duplications.Show More
  • The researchers studied Simons Searchlight participants, including 133 who were 16p11.2 deletion carriers, 122 who were 16p11.2 duplication carriers, and 388 family members who did not carry a genetic variant.
  • For some measures of motor function, the researchers found that 16p11.2 deletion carriers had more difficulties than duplication carriers. 16p11.2 deletion carriers were more likely to be diagnosed with developmental coordination disorder, were more likely to report difficulty with coordination, and had impaired performance on an executive function test. But, the researchers found no differences between 16p11.2 deletion and duplication carriers with respect to age of first walking or impairment in walking.
  • 16p11.2 deletion carriers were less likely than duplication carriers to have tremors and difficulty with gross movements of arms and fingerprint dexterity.
  • Overall, the researchers suggested that people with 16p11.2 deletions might have more difficulty with gross motor issues, whereas people with 16p11.2 duplications might have more issues with fine motor skills.
  • The researchers did not find a link between IQ and coordination or motor speed.Show Less
Autism Res 17, 906-916 (2024)
Jutla et al.
Full Article

16p11.2 deletion
16p11.2 duplication
2024