Exome sequencing in an Italian family with Alzheimer's disease points to a role for seizure-related gene 6 (SEZ6) rare variant R615H

Lara Paracchini, Luca Beltrame, Lucia Boeri, Federica Fusco, Paolo Caffarra, Sergio Marchini, Diego Albani, Gianluigi Forloni

Research output: Contribution to journalArticle

Abstract

Background: The typical familial form of Alzheimer's disease (FAD) accounts for about 5% of total Alzheimer's disease (AD) cases. Presenilins (PSEN1 and PSEN2) and amyloid-β (A4) precursor protein (APP) genes carry all reported FAD-linked mutations. However, other genetic loci may be involved in AD. For instance, seizure-related gene 6 (SEZ6) has been reported in brain development and psychiatric disorders and is differentially expressed in the cerebrospinal fluid of AD cases. Methods: We describe a targeted exome sequencing analysis of a large Italian kindred with AD, negative for PSEN and APP variants, that indicated the SEZ6 heterozygous mutation R615H is associated with the pathology. Results: We overexpressed R615H mutation in H4-SW cells, finding a reduction of amyloid peptide Aβ(1-42). Sez6 expression decreased with age in a mouse model of AD (3xTG-AD), but independently from transgene expression. Conclusions: These results support a role of exome sequencing for disease-associated variant discovery and reinforce available data on SEZ6 in AD models.

Original languageEnglish
JournalAlzheimer's Research and Therapy
Volume10
Issue number1
DOIs
Publication statusPublished - Oct 12 2018

Keywords

  • Alzheimer's disease
  • Exome sequencing
  • Rare variants
  • SEZ6

ASJC Scopus subject areas

  • Neurology
  • Clinical Neurology
  • Cognitive Neuroscience

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