Abstract:
:Marinesco-Sjögren syndrome (MSS) is a rare autosomal recessively inherited disorder with mental retardation (MR). Recently, mutations in the SIL1 gene, encoding a co-chaperone which regulates the chaperone HSPA5, were identified as a major cause of MSS. We here examined the pathophysiological significance of SIL1 mutations in abnormal corticogenesis of MSS. SIL1-silencing caused neuronal migration delay during corticogenesis ex vivo. While RNAi-resistant SIL1 rescued the defects, three MSS-causing SIL1 mutants tested did not. These mutants had lower affinities to HSPA5 in vitro, and SIL1-HSPA5 interaction as well as HSPA5 function was found to be crucial for neuronal migration ex vivo. Furthermore time-lapse imaging revealed morphological disorganization associated with abnormal migration of SIL1-deficient neurons. These results suggest that the mutations prevent SIL1 from interacting with and regulating HSPA5, leading to abnormal neuronal morphology and migration. Consistent with this, when SIL1 was silenced in cortical neurons in one hemisphere, axonal growth in the contralateral hemisphere was delayed. Taken together, abnormal neuronal migration and interhemispheric axon development may contribute to MR in MSS.
journal_name
EMBO Mol Medjournal_title
EMBO molecular medicineauthors
Inaguma Y,Hamada N,Tabata H,Iwamoto I,Mizuno M,Nishimura YV,Ito H,Morishita R,Suzuki M,Ohno K,Kumagai T,Nagata Kdoi
10.1002/emmm.201303069subject
Has Abstractpub_date
2014-03-01 00:00:00pages
414-29issue
3eissn
1757-4676issn
1757-4684pii
emmm.201303069journal_volume
6pub_type
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