Research

Neurodevelopmental Disorders

Epilepsy and Neuro-developmental disorders (NDD) are often caused by genetic mutations that lead to haploinsufficiency, or a loss-of-gene function. Mutations that cause haploinsufficiency of neurodevelopmental genes affect over 200,000 births each year, and commonly result in congenital malformations, intellectual disability, epilepsy and motor and behavioral impairments. While symptomatic treatments exist, for most conditions there are no treatments that directly correct the reduced levels of the haploinsufficient gene. 

To tackle this issue, we’re thrilled to announce that a $25 million gift from an anonymous donor to Penn Medicine and Children’s Hospital of Philadelphia (CHOP) will establish the Center for Epilepsy and Neurodevelopmental Disorders (ENDD). This center will be led by director Benjamin Prosser, PhD, and co-directors Beverly Davidson, PhD,and Ingo Helbig, MD. In addition, ENDD works closely with a multi-disciplinary group of investigators focused on developing new therapies for these intractable conditions, including the Heller Lab at Penn and Debbie French and the Human Pluripotent Stem Cell Core at CHOP, to develop iPS-models of NDD and test novel therapies.

 

The group is focused on developing anti-sense oligonucleotide (ASO), small molecule, and CRISPR-based strategies for the treatment of NDD, with our initial focus on STXBP1- and SYNGAP1-related disorders. The ENDD team is supported by collaborations with the pharmaceutical and biotechnology sector, private foundations including the Syngap Research Fund and STXBP1 Foundation, and philanthropic efforts.

Related Publications

CRISPR-mediated transcriptional activation as a mutation-independent therapeutic strategy for SYNGAP1-related intellectual disability.

CRISPR-mediated transcriptional activation as a mutation-independent therapeutic strategy for SYNGAP1-related intellectual disability.
Sichlinger L, Reilly MB, Arora S, Zhang S, Marotta N, Rodríguez-Acevedo KL, Hooks M, Czarnecki KS, Winter JJ, Waxman EA, Dungan LV, Hong I, Araki Y, Johnson R, Huganir RL, Pavani G, French DL, Davidson BL, Prosser BL, Heller EA.
bioRxiv [Preprint]. 2025 Oct 29:2025.10.28.685100. doi: 10.1101/2025.10.28.685100.PMID: 41279390

Neurodevelopmental Disorders

Familial SYNGAP1 variants define the boundaries of a complex neurodevelopmental disorder with epilepsy

Familial SYNGAP1 variants define the boundaries of a complex neurodevelopmental disorder with epilepsy.
Harrison AG, Magielski JH, McSalley I, Ganesan S, Prentice AJ, Cunningham KG, Pierce SR, Boland MJ, Prosser BL, Helbig I, McKee JL.
Epilepsia. 2025 Sep 23;66(9):3505-3515. doi: 10.1111/epi.18469. PMID: 40407699.

Neurodevelopmental Disorders

Clinical signatures of SYNGAP1-related disorders through data integration.

Clinical signatures of SYNGAP1-related disorders through data integration.
McKee JL, Magielski JH, Xian J, Cohen S, Toib J, Harrison A, Chen C, Kim D, Rathod A, Brimble E, Fitter N, Graglia JM, Helde KA, McKeown Ruggiero S, Boland MJ, Prosser BL, Sederman R, Helbig I.
Genet Med. 2025 Jun;27(6):101419. https://doi.org/10.1016/j.gim.2025.101419. PMID: 40119723. PMCID: PMC12419475.

Neurodevelopmental Disorders

Translatable electrophysiological and behavioral abnormalities in a humanized model of SYNGAP1-disorder.

Translatable electrophysiological and behavioral abnormalities in a humanized model of SYNGAP1-disorder.
Felix AJ, Brown, BL, Marotta N, Gessner, MJ, Houserova, M, Huerta-Ocampo I, Wilson T, Randell R, Dawicki-McKenna JM, Reinhardt D, Uchida K, McSalley I, McKee JL, Helbig I, Boland MJ, Davidson BL, Prosser BL.
bioRxiv. 2024 August 22 (updated 2025 November 8). doi:10.1101/2024.08.22.609238v3.

Neurodevelopmental Disorders

STXBP1: fast-forward to a brighter future – a patient organization perspective.

STXBP1: fast-forward to a brighter future – a patient organization perspective.
Goss JR, Prosser BL, Helbig I, Son Rigby C.
Ther Adv Rare Dis. 2024 Jun 18;5:26330040241257221. doi: 10.1177/26330040241257221. PMID: 38898886. eCollection 2024 Jan-Dec. Review

Neurodevelopmental Disorders

Accelerating therapeutic development and clinical trial readiness for STXBP1 and SYNGAP1 disorders.

Accelerating therapeutic development and clinical trial readiness for STXBP1 and SYNGAP1 disorders.
Marotta N, Boland MJ, Prosser BL.
Probl Pediatr Adolesc Health Care. 2024 Mar 11:101576. doi: 10.1016/j.cppeds.2024.101576. PMID: 38472035. Review.

Neurodevelopmental Disorders

Early life seizures and epileptic spasms in STXBP1 -related disorders.

Early life seizures and epileptic spasms in STXBP1 -related disorders.
Thalwitzer KM, Xian J, deCampo D, Parthasarathy S, Magielski J, Sullivan KR, Goss J, Rigby CS, Boland M, Prosser B, Ruggiero SM, Syrbe S, Helbig I.
Epilepsia. 2024 Mar;65(3):805-816. PMID: 38279907. doi: 10.1111/epi.17886. Epub 2024 Jan 27.

Neurodevelopmental Disorders

Delineating clinical and developmental outcomes in STXBP1 -related disorders.

Delineating clinical and developmental outcomes in STXBP1-related disorders.
Xian J, Thalwitzer KM, McKee J, Sullivan KR, Brimble E, Fitch E, Toib J, Kaufman MC, deCampo D, Cunningham K, Pierce SR, Goss J, Son Rigby C, Syrbe S, Boland M, Prosser B, Fitter N, Ruggiero SM, Helbig I.
Brain. 2023 Dec 1;146(12):5182-5197. PMID: 38015929. doi: 10.1093/brain/awad287.

Neurodevelopmental Disorders

Mapping PTBP2 binding in human brain identifies SYNGAP1 as a target for therapeutic splice switching.

Mapping PTBP2 binding in human brain identifies SYNGAP1 as a target for therapeutic splice switching.
Dawicki-McKenna JM, Felix AJ, Waxman EA, Cheng C, Amado DA, Ranum PT, Bogush A, Dungan LV, Maguire JA, Gagne AL, Heller EA, French DL, Davidson BL, Prosser BL.
Nat Commun. 2023 May 6;14(1):2628. PMID: 37149717. doi: 10.1038/s41467-023-38273-3.

Neurodevelopmental Disorders RNA Biology

Assessing the landscape of STXBP1-related disorders in 534 individuals

Assessing the landscape of STXBP1-related disorders in 534 individuals.
Xian J, Parthasarathy S, Ruggiero SM, Balagura G, Fitch E, Helbig K, Gan J, Ganesan S, Kaufman MC, Ellis CA, Lewis-Smith D, Galer P, Cunningham K, O’Brien M, Cosico M, Baker K, Darling A, Veiga de Goes F, El Achkar CM, Doering JH, Furia F, García-Cazorla Á, Gardella E, Geertjens L, Klein C, Kolesnik-Taylor A, Lammertse H, Lee J, Mackie A, Misra-Isrie M, Olson H, Sexton E, Sheidley B, Smith L, Sotero L, Stamberger H, Syrbe S, Thalwitzer KM, van Berkel A, van Haelst M, Yuskaitis C, Weckhuysen S, Prosser B, Son Rigby C, Demarest S, Pierce S, Zhang Y, Møller RS, Bruining H, Poduri A, Zara F, Verhage M, Striano P, Helbig I.
Brain. 2022 Jun 3;145(5):1668-1683. PMID: 35190816. doi: 10.1093/brain/awab327.

Neurodevelopmental Disorders

Base editing the synapse: Modeling a complex neurological disorder in non-human primates.

Base editing the synapse: Modeling a complex neurological disorder in non-human primates.
Prosser BL, Helbig I.
Mol Ther. 2022 Jun 1;30(6):2114-2116. Epub 2022 May 24. PMID: 35613622. doi: 10.1016/j.ymthe.2022.05.009.

Neurodevelopmental Disorders