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  • program_project
  • nrc
  • whocc
  • project
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  • tool
  • patent
  • Administrative Staff
  • Assistant Professor
  • Associate Professor
  • Clinical Research Assistant
  • Clinician Researcher
  • Department Manager
  • Full Professor
  • Graduate Student
  • Honorary Professor
  • Lab assistant
  • Non-permanent Researcher
  • Permanent Researcher
  • Pharmacist
  • PhD Student
  • Physician
  • Post-doc
  • Project Manager
  • Research Associate
  • Research Engineer
  • Retired scientist
  • Technician
  • Undergraduate Student
  • Veterinary
  • Visiting Scientist
  • Deputy Director of Center
  • Deputy Director of Department
  • Deputy Director of National Reference Center
  • Deputy Head of Facility
  • Director of Center
  • Director of Department
  • Director of Institute
  • Director of National Reference Center
  • Group Leader
  • Head of Facility
  • Head of Operations
  • Head of Structure
  • Honorary President of the Departement
  • Labex Coordinator
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Starting Date
18
Mar 2017
Ending Date
18
Mar 2027
Status
Ongoing
Members
15
Structures
2

About

Our team identified the first mutations in the SHANK3 gene, showing it’s role in autism and Phelan-McDermid Syndrome (PMS). Thanks to a donation from the French Association of Phelan-McDermid Syndrome, we will continue the whole genome sequencing of PMS patients in order to identify genomic regions associated with the severity of clinical symptoms. This study will lead to better diagnosis and to the identification of new therapeutic targets.

Phelan-McDermid syndrome (PMS) is a neurodevelopmental disorder with non-specific clinical features. The main symptoms are hypotonia, intellectual disability (ID), absent or delayed speech together with minor dysmorphic features. More than half of the patients exhibit autism spectrum disorders (ASD).
PMS is a contiguous gene syndrome resulting from deletion of the distal long arm of chromosome 22. The type and the size of the deletion can vary from one patient to another. In the vast majority of the cases, the deletion is de novo.
There is a gradient of severity in PMS. Some patients have difficulty to walk or may have a severe intellectual disability while other patients can speak and go to high school. The size of the deletion seems to contribute to the presence of some features (speech problems are more frequent in patients with large deletions). In contrast, seizures, hypotonia, birth weight, and gestational age at birth do not seem to correlate with deletion size.
Among the genes located at 22q13, we previously identified deleterious de novo mutations of the SHANK3 gene in patients with ASD and ID. SHANK3 codes for a synaptic scaffolding protein that plays an important role in the formation of dendrites and glutamatergic synapses. While SHANK3 has been extensively studied as a candidate gene for the neurological symptoms of PMS, it is clear that many other genes in the region are involved in the pathogenesis of PMS.

Projects

Genetic and phenotypic diversity of patients with PMS in Europe

In order to identify factors that influence the severity of the syndrome, we aim to analyze the relationship between genotype and phenotype in patients with PMS. Instead of focusing only on the 22q13 region, we want to analyze the whole genome of each patient in order to identify genetic variations that will contribute to the severity of the disorders. For example, we want to identify which genes will contribute to the risk of developing epilepsy.

Cellular and mouse models of PMS

In order to identify the mechanisms underlying the syndrome and the main neural circuits involved, we are currently studying cellular and mouse models of PMS. Our cellular models consist of neurons derived from induced pluripotent stem cells (iPSC) from PMS patients with autistic disorders and carrying a de novo mutation altering the function of one copy of the SHANK3 gene. Our mouse models are mice that have lost part or all of the Shank3 gene.

TO COME: Effect of lithium in patients with both autism spectrum disorder and Phelan-McDermid syndrome (SHANK3 haploinsufficiency), phase 2 pilot study

To date, there is no pharmacological treatment that has shown activity on the symptoms of these disorders, in particular social communication deficit. However, we have previously shown that lithium can restore synaptic dysfunction caused by a defect in the SHANK3 gene. The primary objective of the current clinical trial is to evaluate the effect of lithium at 12 weeks (capsules dosed at 62.5mg, 125mg and 250mg), compared to placebo, on social communication deficit in patients with Phelan-McDermid syndrome.

Below are the patient inclusion criteria for the lithium trial:

  • Children aged 7 years to 17 years and 8 months
  • Minimum weight of 19 kg for children aged 7 years
  • Patient with SHANK3 haploinsufficiency, i.e., carrier of a deletion (CNV) involving the SHANK3 gene or a de novo truncating mutation in SHANK3 (Phelan-McDermid syndrome)
  • Autism spectrum disorder
  • Sexually active patients of childbearing potential must agree to use a highly effective form of contraception during the study period (estrogen/progestin contraception, or intrauterine device, or abstinence)
  • Affiliation to social security system
  • Signature of consent by the holders of parental authority
  • Non-participation in another clinical trial at the same time

Constraints related to participation in the study: recurrent blood sampling during the first month (once a week) at the Robert-Debré Hospital in Paris.

Our collaborators

Foundations and collaborative groups
Clinicians/Geneticists
Neurobiologists

Please visit the Frontiers Research Topics on Shankopathies.

About SHANK2 disorders? Check the website of the recent SHANK2 Foundation! Register your child in the SHANK2 Patient Registry and help it grows.

Our recent papers on the Phelan-McDermid syndrome and SHANK3:


A framework to identify contributing genes in patients with Phelan-McDermid syndrome
Anne-Claude Tabet, Thomas Rolland et al.

 

Human pluripotent stem cell-derived cortical neurons for high-throughput medication screening in autism: a proof of concept study in SHANK3 haploinsufficiency syndrome
Hélène Darville et al.

Fundings