Disruption of TBC1D7, a subunit of the TSC1-TSC2 protein complex, in intellectual disability and megalencephaly.

Abstract:

BACKGROUND:Mutations in TSC1 or TSC2 cause the tuberous sclerosis complex (TSC), a disorder characterised by the development of hamartomas or benign tumours in various organs as well as the variable presence of epilepsy, intellectual disability (ID) and autism. TSC1, TSC2 and the recently described protein TBC1D7 form a complex that inhibits mTORC1 signalling and limits cell growth. Although it has been proposed that mutations in TBC1D7 might also cause TSC, loss of its function has not yet been documented in humans. METHODS AND RESULTS:We used homozygosity mapping and exome sequencing to study a consanguineous family with ID and megalencephaly but without any specific features of TSC. We identified only one rare coding variant, c.538delT:p.Y180fsX1 in TBC1D7, in the regions of homozygosity shared by the affected siblings. We show that this mutation abolishes TBC1D7 expression and is associated with increased mTORC1 signalling in cells of the affected individuals. CONCLUSIONS:Our study suggests that disruption of TBC1D7 causes ID but without the other typical features found in TSC. Although megalencephaly is not commonly observed in TSC, it has been associated with mTORC1 activation. Our observation thus reinforces the relationship between this pathway and the development of megalencephaly.

journal_name

J Med Genet

authors

Capo-Chichi JM,Tcherkezian J,Hamdan FF,Décarie JC,Dobrzeniecka S,Patry L,Nadon MA,Mucha BE,Major P,Shevell M,Bencheikh BO,Joober R,Samuels ME,Rouleau GA,Roux PP,Michaud JL

doi

10.1136/jmedgenet-2013-101680

subject

Has Abstract

pub_date

2013-11-01 00:00:00

pages

740-4

issue

11

eissn

0022-2593

issn

1468-6244

pii

jmedgenet-2013-101680

journal_volume

50

pub_type

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