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https://hdl.handle.net/2440/44859
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Type: | Journal article |
Title: | Molecular pathology of expanded polyalanine tract mutations in the Aristaless-related homeobox gene |
Author: | Shoubridge, C. Cloosterman, D. Parkinson-Lawrence, E. Brooks, D. Gecz, J. |
Citation: | Genomics, 2007; 90(1):59-71 |
Publisher: | Academic Press Inc Elsevier Science |
Issue Date: | 2007 |
ISSN: | 0888-7543 1089-8646 |
Statement of Responsibility: | Cheryl Shoubridge, Desiree Cloosterman, Emma Parkinson–Lawerence, Douglas Brooks and Jozef Gécz |
Abstract: | The Aristaless-related homeobox gene (ARX) is one of the major genes causing X-linked mental retardation. We have been interested in the pathogenic mechanism of expanded polyalanine tract mutations in ARX. We showed that the c.304ins(GCG)7 mutation causing an increase from 16 to 23 alanines increased the propensity of ARX protein aggregation and a shift from nuclear to cytoplasmic localization. We proposed that mislocalization of ARX via cytoplasmic aggregation and subsequent degradation leads to a partial loss of function, contributing to the pathogenesis. We identified importin 13 (IPO13), a mediator of nuclear import for a variety of proteins, as a novel ARX interacting protein. We predicted that the transport of ARX by IPO13 from the cytoplasm to the nucleus might be disrupted by expanded polyalanine tract mutations, but our data showed that in both yeast and mammalian cells these mutant ARX proteins were still able to interact with IPO13. We established the nuclear localization regions of the ARX homeodomain that were required for the interaction with IPO13 and correct localization of the full-length ARX transcription factor to the nucleus. |
Keywords: | Cell Line Cell Line, Tumor PC12 Cells Cytoplasm Animals Humans Rats Mental Retardation, X-Linked Peptides Karyopherins Homeodomain Proteins Transcription Factors Transfection Cell Death Amino Acid Sequence Active Transport, Cell Nucleus Mutation Molecular Sequence Data |
Description: | Crown copyright © 2007 Published by Elsevier Inc. |
DOI: | 10.1016/j.ygeno.2007.03.005 |
Description (link): | http://www.elsevier.com/wps/find/journaldescription.cws_home/622838/description#description |
Published version: | http://dx.doi.org/10.1016/j.ygeno.2007.03.005 |
Appears in Collections: | Aurora harvest 6 Paediatrics publications |
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