TBR1, a T-box transcription factor expressed in the cerebral cortex, regulates the expression of several candidate genes for autism spectrum disorders (ASD). Although TBR1 has been reported as a high-confidence risk gene for ASD and intellectual disability (ID) in functional and clinical reports since 2011, TBR1 has only recently been recorded as a human disease gene in the OMIM database. Currently, the neurodevelopmental disorders and structural brain anomalies associated with TBR1 variants are not well characterized. Through international data sharing, we collected data from 25 unreported individuals and compared them with data from the literature. We evaluated structural brain anomalies in seven individuals by analysis of MRI images, and compared these with anomalies observed in TBR1 mutant mice. The phenotype included ID in all individuals, associated to autistic traits in 76% of them. No recognizable facial phenotype could be identified. MRI analysis revealed a reduction of the anterior commissure and suggested new features including dysplastic hippocampus and subtle neocortical dysgenesis. This report supports the role of TBR1 in ID associated with autistic traits and suggests new structural brain malformations in humans. We hope this work will help geneticists to interpret TBR1 variants and diagnose ASD probands. © 2020, The Author(s), under exclusive licence to European Society of Human Genetics.
De novo TBR1 variants cause a neurocognitive phenotype with ID and autistic traits: report of 25new individuals and review of the literature / Nambot S, Faivre L, Mirzaa G, Thevenon J, Bruel AL, Mosca-Boidron AL, Masurel-Paulet A, Goldenberg A, Le Meur N,Charollais A, Mignot C, Petit F, Rossi M, Metreau J, Layet V, Amram D, Boute-Bénéjean O, Bhoj E, Cousin MA, Kruisselbrink TM, Lanpher BC, Klee EW, Fiala E, Grange DK, Meschino WS, Hiatt SM, Cooper GM, Olivié H, Smith WE, Dumas M,Lehman A; CAUSES Study, Inglese C, Nizon M, Guerrini R, Vetro A, Kaplan ES, Miramar D, Van Gils J, Fergelot P, Bodamer O, Herkert JC, Pajusalu S, Õunap K, Filiano JJ, Smol T, Piton A, Gérard B, Chantot-Bastaraud S, Bienvenu T, Li D, Juusola J, Devriendt K,Bilan F, Poé C, Chevarin M, Jouan T, Tisserant E, Rivière JB, Tran Mau-Them F, Philippe C, Duffourd Y, Dobyns WB, Hevner R,Thauvin-Robinet C. - In: EUROPEAN JOURNAL OF NEUROLOGY. - ISSN 1468-1331. - ELETTRONICO. - article in press:(2020), pp. 0-0. [10.1038/s41431-020-0571-6]
De novo TBR1 variants cause a neurocognitive phenotype with ID and autistic traits: report of 25new individuals and review of the literature
Guerrini R;Vetro A;
2020
Abstract
TBR1, a T-box transcription factor expressed in the cerebral cortex, regulates the expression of several candidate genes for autism spectrum disorders (ASD). Although TBR1 has been reported as a high-confidence risk gene for ASD and intellectual disability (ID) in functional and clinical reports since 2011, TBR1 has only recently been recorded as a human disease gene in the OMIM database. Currently, the neurodevelopmental disorders and structural brain anomalies associated with TBR1 variants are not well characterized. Through international data sharing, we collected data from 25 unreported individuals and compared them with data from the literature. We evaluated structural brain anomalies in seven individuals by analysis of MRI images, and compared these with anomalies observed in TBR1 mutant mice. The phenotype included ID in all individuals, associated to autistic traits in 76% of them. No recognizable facial phenotype could be identified. MRI analysis revealed a reduction of the anterior commissure and suggested new features including dysplastic hippocampus and subtle neocortical dysgenesis. This report supports the role of TBR1 in ID associated with autistic traits and suggests new structural brain malformations in humans. We hope this work will help geneticists to interpret TBR1 variants and diagnose ASD probands. © 2020, The Author(s), under exclusive licence to European Society of Human Genetics.
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