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  • Lab assistant
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  • PhD Student
  • Physician
  • Post-doc
  • Project Manager
  • Research Engineer
  • Retired scientist
  • Technician
  • Undergraduate Student
  • Visiting Scientist
  • Deputy Director of Center
  • Deputy Director of Department
  • Deputy Director of National Reference Center
  • Director of Center
  • Director of Department
  • Director of Institute
  • Director of National Reference Center
  • Group Leader
  • Head of Facility
  • 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
18
Structures
3

About

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

The genetic and phenotypic diversity of patients with PMS in Europe

In order to identify the factors that can modulate the severity of the syndrome, we aim at analyzing the genotype-phenotype relationship in all patients with PMS in Europe. Instead of focusing on the size of the 22q13 deletion, we want to analyze the whole genome of all patients with PMS.

Cellular and mouse models of PMS

In order to identify the causative mechanisms and the main neuronal circuits involved in PMS, we are currently studying cellular and mouse models of the syndrome. Our cellular models consist of neurons derived from induced pluripotent stem cells (iPSC) of patients with PMS or ASD carrying a de novo SHANK3 mutation. Our mouse models are based on mice lacking the SHANK3 gene.

Collaborators

Foundations and collaborative groups

Clinicians/Geneticists

Neurobiologists 

News ! 

Please visit the Frontiers Research Topics on

Shankopathies: Shank Protein Deficiency-Induced Synaptic Diseases

http://journal.frontiersin.org/researchtopic/6607/shankopathies-shank-protein-deficiency-induced-synaptic-diseases#overview

 

Our new papers on PMS and SHANK:

A framework to identify modifier genes in patients with Phelan-McDermid syndrome

http://biorxiv.org/content/early/2017/03/18/117978

Human Pluripotent Stem Cell-derived Cortical Neurons for High Throughput Medication Screening in Autism: A Proof of Concept Study in SHANK3 Haploinsufficiency Syndrome

http://www.ebiomedicine.com/article/S2352-3964(16)30228-6/fulltext

 

 

Fundings