Larger aggregates of mutant seipin in Celia's Encephalopathy, a new protein misfolding neurodegenerative disease

Alejandro Ruiz-Riquelme, Sofía Sánchez-Iglesias, Alberto Rábano, Encarna Guillén-Navarro, Rosario Domingo-Jiménez, Adriana Ramos, Isaac Rosa, Ana Senra, Peter Nilsson, Ángel García, David Araújo-Vilar, Jesús R. Requena

Research output: Contribution to journalArticlepeer-review


Celia's Encephalopathy (MIM #. 615924) is a recently discovered fatal neurodegenerative syndrome associated with a new BSCL2 mutation (c.985C>T) that results in an aberrant isoform of seipin (Celia seipin). This mutation is lethal in both homozygosity and compounded heterozygosity with a lipodystrophic BSCL2 mutation, resulting in a progressive encephalopathy with fatal outcomes at ages 6-8. Strikingly, heterozygous carriers are asymptomatic, conflicting with the gain of toxic function attributed to this mutation. Here we report new key insights about the molecular pathogenic mechanism of this new syndrome. Intranuclear inclusions containing mutant seipin were found in brain tissue from a homozygous patient suggesting a pathogenic mechanism similar to other neurodegenerative diseases featuring brain accumulation of aggregated, misfolded proteins. Sucrose gradient distribution showed that mutant seipin forms much larger aggregates as compared with wild type (wt) seipin, indicating an impaired oligomerization. On the other hand, the interaction between wt and Celia seipin confirmed by coimmunoprecipitation (CoIP) assays, together with the identification of mixed oligomers in sucrose gradient fractionation experiments can explain the lack of symptoms in heterozygous carriers. We propose that the increased aggregation and subsequent impaired oligomerization of Celia seipin leads to cell death. In heterozygous carriers, wt seipin might prevent the damage caused by mutant seipin through its sequestration into harmless mixed oligomers.

Original languageEnglish (US)
Pages (from-to)44-53
Number of pages10
JournalNeurobiology of Disease
StatePublished - Nov 1 2015


  • BSCL2
  • Celia's encephalopathy
  • Intranuclear inclusions
  • Lipodystrophy
  • Neurodegeneration
  • Oligomerization
  • Phenotype rescue
  • Progressive encephalopathy
  • Seipin

ASJC Scopus subject areas

  • Neurology


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