Combined loss of LAP1B and LAP1C results in an early onset multisystemic nuclear envelopathy

Boris Fichtman, Fadia Zagairy, Nitzan Biran, Yiftah Barsheshet, Elena Chervinsky, Ziva Ben Neriah, Avraham Shaag, Michael Assa, Orly Elpeleg, Amnon Harel, Ronen Spiegel

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35 Scopus citations

Abstract

Nuclear envelopathies comprise a heterogeneous group of diseases caused by mutations in genes encoding nuclear envelope proteins. Mutations affecting lamina-associated polypeptide 1 (LAP1) result in two discrete phenotypes of muscular dystrophy and progressive dystonia with cerebellar atrophy. We report 7 patients presenting at birth with severe progressive neurological impairment, bilateral cataract, growth retardation and early lethality. All the patients are homozygous for a nonsense mutation in the TOR1AIP1 gene resulting in the loss of both protein isoforms LAP1B and LAP1C. Patient-derived fibroblasts exhibit changes in nuclear envelope morphology and large nuclear-spanning channels containing trapped cytoplasmic organelles. Decreased and inefficient cellular motility is also observed in these fibroblasts. Our study describes the complete absence of both major human LAP1 isoforms, underscoring their crucial role in early development and organogenesis. LAP1-associated defects may thus comprise a broad clinical spectrum depending on the availability of both isoforms in the nuclear envelope throughout life.

Original languageEnglish
Article number605
JournalNature Communications
Volume10
Issue number1
DOIs
StatePublished - 5 Feb 2019

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© 2019, The Author(s).

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