Clinical spectrum of MTOR-related hypomelanosis ...
Type de document :
Article dans une revue scientifique: Article original
PMID :
URL permanente :
Titre :
Clinical spectrum of MTOR-related hypomelanosis of Ito with neurodevelopmental abnormalities.
Auteur(s) :
Carmignac, V. [Auteur]
Mignot, C. [Auteur]
Blanchard, E. [Auteur]
Kuentz, P. [Auteur]
Aubriot-Lorton, M. H. [Auteur]
Parker, V. E. R. [Auteur]
Sorlin, A. [Auteur]
Fraitag, S. [Auteur]
Courcet, J. B. [Auteur]
Duffourd, Y. [Auteur]
Rodriguez, D. [Auteur]
Knox, R. G. [Auteur]
Polubothu, S. [Auteur]
Boland, A. [Auteur]
Olaso, R. [Auteur]
Delepine, M. [Auteur]
Darmency, V. [Auteur]
Riachi, M. [Auteur]
Quelin, C. [Auteur]
Rollier, P. [Auteur]
Goujon, L. [Auteur]
Grotto, S. [Auteur]
Capri, Y. [Auteur]
Jacquemont, M. L. [Auteur]
Odent, S. [Auteur]
Amram, D. [Auteur]
Chevarin, M. [Auteur]
Vincent, Catherine [Auteur]
Maladies Rares du Développement : Génétique, Régulation et Protéomique (RADEME) - ULR 7364
Catteau, Benoît [Auteur]
Centre Hospitalier Régional Universitaire [CHU Lille] [CHRU Lille]
Guibaud, L. [Auteur]
Arzimanoglou, A. [Auteur]
Keddar, M. [Auteur]
Sarret, C. [Auteur]
Callier, P. [Auteur]
Bessis, D. [Auteur]
Geneviève, D. [Auteur]
Deleuze, J. F. [Auteur]
Thauvin, C. [Auteur]
Semple, R. K. [Auteur]
Philippe, C. [Auteur]
Rivière, J. B. [Auteur]
Kinsler, V. A. [Auteur]
Faivre, L. [Auteur]
Vabres, P. [Auteur]
Mignot, C. [Auteur]
Blanchard, E. [Auteur]
Kuentz, P. [Auteur]
Aubriot-Lorton, M. H. [Auteur]
Parker, V. E. R. [Auteur]
Sorlin, A. [Auteur]
Fraitag, S. [Auteur]
Courcet, J. B. [Auteur]
Duffourd, Y. [Auteur]
Rodriguez, D. [Auteur]
Knox, R. G. [Auteur]
Polubothu, S. [Auteur]
Boland, A. [Auteur]
Olaso, R. [Auteur]
Delepine, M. [Auteur]
Darmency, V. [Auteur]
Riachi, M. [Auteur]
Quelin, C. [Auteur]
Rollier, P. [Auteur]
Goujon, L. [Auteur]
Grotto, S. [Auteur]
Capri, Y. [Auteur]
Jacquemont, M. L. [Auteur]
Odent, S. [Auteur]
Amram, D. [Auteur]
Chevarin, M. [Auteur]
Vincent, Catherine [Auteur]
Maladies Rares du Développement : Génétique, Régulation et Protéomique (RADEME) - ULR 7364
Catteau, Benoît [Auteur]
Centre Hospitalier Régional Universitaire [CHU Lille] [CHRU Lille]
Guibaud, L. [Auteur]
Arzimanoglou, A. [Auteur]
Keddar, M. [Auteur]
Sarret, C. [Auteur]
Callier, P. [Auteur]
Bessis, D. [Auteur]
Geneviève, D. [Auteur]
Deleuze, J. F. [Auteur]
Thauvin, C. [Auteur]
Semple, R. K. [Auteur]
Philippe, C. [Auteur]
Rivière, J. B. [Auteur]
Kinsler, V. A. [Auteur]
Faivre, L. [Auteur]
Vabres, P. [Auteur]
Titre de la revue :
Genet Med
Nom court de la revue :
Genet Med
Numéro :
23
Pagination :
1484-1491
Date de publication :
2021-04-16
ISSN :
1530-0366
Discipline(s) HAL :
Sciences du Vivant [q-bio]
Résumé en anglais : [en]
Purpose
Hypomelanosis of Ito (HI) is a skin marker of somatic mosaicism. Mosaic MTOR pathogenic variants have been reported in HI with brain overgrowth. We sought to delineate further the pigmentary skin phenotype and ...
Lire la suite >Purpose Hypomelanosis of Ito (HI) is a skin marker of somatic mosaicism. Mosaic MTOR pathogenic variants have been reported in HI with brain overgrowth. We sought to delineate further the pigmentary skin phenotype and clinical spectrum of neurodevelopmental manifestations of MTOR-related HI. Methods From two cohorts totaling 71 patients with pigmentary mosaicism, we identified 14 patients with Blaschko-linear and one with flag-like pigmentation abnormalities, psychomotor impairment or seizures, and a postzygotic MTOR variant in skin. Patient records, including brain magnetic resonance image (MRI) were reviewed. Immunostaining (n = 3) for melanocyte markers and ultrastructural studies (n = 2) were performed on skin biopsies. Results MTOR variants were present in skin, but absent from blood in half of cases. In a patient (p.[Glu2419Lys] variant), phosphorylation of p70S6K was constitutively increased. In hypopigmented skin of two patients, we found a decrease in stage 4 melanosomes in melanocytes and keratinocytes. Most patients (80%) had macrocephaly or (hemi)megalencephaly on MRI. Conclusion MTOR-related HI is a recognizable neurocutaneous phenotype of patterned dyspigmentation, epilepsy, intellectual deficiency, and brain overgrowth, and a distinct subtype of hypomelanosis related to somatic mosaicism. Hypopigmentation may be due to a defect in melanogenesis, through mTORC1 activation, similar to hypochromic patches in tuberous sclerosis complex.Lire moins >
Lire la suite >Purpose Hypomelanosis of Ito (HI) is a skin marker of somatic mosaicism. Mosaic MTOR pathogenic variants have been reported in HI with brain overgrowth. We sought to delineate further the pigmentary skin phenotype and clinical spectrum of neurodevelopmental manifestations of MTOR-related HI. Methods From two cohorts totaling 71 patients with pigmentary mosaicism, we identified 14 patients with Blaschko-linear and one with flag-like pigmentation abnormalities, psychomotor impairment or seizures, and a postzygotic MTOR variant in skin. Patient records, including brain magnetic resonance image (MRI) were reviewed. Immunostaining (n = 3) for melanocyte markers and ultrastructural studies (n = 2) were performed on skin biopsies. Results MTOR variants were present in skin, but absent from blood in half of cases. In a patient (p.[Glu2419Lys] variant), phosphorylation of p70S6K was constitutively increased. In hypopigmented skin of two patients, we found a decrease in stage 4 melanosomes in melanocytes and keratinocytes. Most patients (80%) had macrocephaly or (hemi)megalencephaly on MRI. Conclusion MTOR-related HI is a recognizable neurocutaneous phenotype of patterned dyspigmentation, epilepsy, intellectual deficiency, and brain overgrowth, and a distinct subtype of hypomelanosis related to somatic mosaicism. Hypopigmentation may be due to a defect in melanogenesis, through mTORC1 activation, similar to hypochromic patches in tuberous sclerosis complex.Lire moins >
Langue :
Anglais
Audience :
Internationale
Vulgarisation :
Non
Établissement(s) :
Université de Lille
CHU Lille
CHU Lille
Collections :
Date de dépôt :
2024-06-25T21:52:44Z
2024-10-25T08:14:23Z
2024-10-25T08:14:23Z
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