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Extensive phenotyping of two ARX polyalanine expansion mutation mouse models that span clinical spectrum of intellectual disability and epilepsy. | LitMetric

Extensive phenotyping of two ARX polyalanine expansion mutation mouse models that span clinical spectrum of intellectual disability and epilepsy.

Neurobiol Dis

Intellectual Disability Research, Adelaide Medical School, The University of Adelaide, Adelaide, South Australia, Australia; Robinson Research Institute, The University of Adelaide, Adelaide, South Australia, Australia. Electronic address:

Published: September 2017

AI Article Synopsis

Article Abstract

The Aristaless-related homeobox gene (ARX) is a known intellectual disability (ID) gene that frequently presents with X-linked infantile spasm syndrome as a comorbidity. ID with epilepsy in children is a chronic and devastating disorder that has poor treatment options and disease outcomes. To gain a better understanding of the role that mutations in ARX play in ID and epilepsy, we investigate ARX patient mutations modelled in mice. Over half of all ARX mutations result from expansions of the first two polyalanine (PA1 and PA2 respectively) tracts. However, phenotypic data for the mouse modelling the more frequent ARX PA2 dup24 mutation in patients has not been reported and constitutes a barrier to understanding the molecular mechanisms involved. Here we report the first comprehensive analysis of postnatal outcomes for mice modelling disease-causing expansions to both PA1 and PA2 tracts. Both strains were found to have impaired learning and memory, reduced activity, increased anxiety and reduced sociability; with PA1 mice generally displaying greater behavioural deficits in keeping with the more severe phenotype reported in patients. In agreement with previous reports, 70% of PA1 males exhibit myoclonic seizures by two months of age, with the first observed at P18. In this report, we show 80% of PA2 males also display myoclonic seizures, with the first observed at P19. Consistent with patient phenotypes, we observe large variations in seizure progression and severity for both PA1 and PA2 individual mice. The generation of this comprehensive baseline data is a necessary step on the path to the development of therapies to improve patient outcomes.

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Source
http://dx.doi.org/10.1016/j.nbd.2017.05.012DOI Listing

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