The KASH-containing isoform of Nesprin1 giant associates with ciliary rootlets of ependymal cells.

Abstract:

:Biallelic nonsense mutations of SYNE1 underlie a variable array of cerebellar and non-cerebellar pathologies of unknown molecular etiology. SYNE1 encodes multiple isoforms of Nesprin1 that associate with the nuclear envelope, with large cerebellar synapses and with ciliary rootlets of photoreceptors. Using two novel mouse models, we determined the expression pattern of Nesprin1 isoforms in the cerebellum whose integrity and functions are invariably affected by SYNE1 mutations. We further show that a giant isoform of Nesprin1 associates with the ciliary rootlets of ependymal cells that line brain ventricles and establish that this giant ciliary isoform of Nesprin1 harbors a KASH domain. Whereas cerebellar phenotypes are not recapitulated in Nes1gSTOP/STOP mice, these mice display a significant increase of ventricular volume. Together, these data fuel novel hypotheses about the molecular pathogenesis of SYNE1 mutations and support that KASH proteins may localize beyond the nuclear envelope in vivo.

journal_name

Neurobiol Dis

journal_title

Neurobiology of disease

authors

Potter C,Razafsky D,Wozniak D,Casey M,Penrose S,Ge X,Mahjoub MR,Hodzic D

doi

10.1016/j.nbd.2018.04.006

subject

Has Abstract

pub_date

2018-07-01 00:00:00

pages

82-91

eissn

0969-9961

issn

1095-953X

pii

S0969-9961(18)30114-1

journal_volume

115

pub_type

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