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Article Dans Une Revue European Journal of Medical Genetics Année : 2018

Mutations in TBR1 gene leads to cortical malformations and intellectual disability

Nancy Vegas
  • Fonction : Auteur
Mara Cavallin
  • Fonction : Auteur
Tjitske Kleefstra
  • Fonction : Auteur
Lonneke de Boer
  • Fonction : Auteur
Marion Philbert
  • Fonction : Auteur
Camille Maillard
  • Fonction : Auteur
Nathalie Boddaert
Arnold Munnich
  • Fonction : Auteur
Laurence Hubert
  • Fonction : Auteur
Claude Besmond
  • Fonction : Auteur
Nadia Bahi-Buisson
  • Fonction : Auteur

Résumé

The advent of next generation sequencing has improved gene discovery in neurodevelopmental disorders. A greater understanding of the genetic basis of these disorders has expanded the spectrum of pathogenic genes, thus enhancing diagnosis and therapeutic management. Genetic overlap between distinct neurodevelopmental disorders has also been revealed, which can make determining a strict genotype-phenotype correlation more difficult. Intellectual disability and cortical malformations are two neurodevelopmental disorders particularly confronted by this difficulty. Indeed, for a given pathogenic gene, intellectual disability can be associated, or not, with cortical malformations. Here, we report for the first time, two individuals with the same de novo mutation in TBR1, leading to a frameshift starting at codon Thr532, and resulting in a premature stop codon 143 amino acids downstream (c.1588_1594dup, p.(Thr532Argfs*144)). These individuals presented with a developmental encephalopathy characterized by frontal pachygyria and severe intellectual disability. Remarkably, 11 TBR1 gene mutations were previously reported in intellectual disability and autism spectrum disorders. Our study supports the observation that TBR1-related disorders range from intellectual disability to frontal pachygyria. We also highlight the need for first-line, good quality neuroimaging for patients with intellectual disability.
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Dates et versions

hal-02878209 , version 1 (22-06-2020)

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Citer

Nancy Vegas, Mara Cavallin, Tjitske Kleefstra, Lonneke de Boer, Marion Philbert, et al.. Mutations in TBR1 gene leads to cortical malformations and intellectual disability. European Journal of Medical Genetics, 2018, 61 (12), pp.759-764. ⟨10.1016/j.ejmg.2018.09.012⟩. ⟨hal-02878209⟩
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