SORL1 mutations in early- and late-onset Alzheimer disease

Michael Cuccaro, Regina M. Carney, Yalun Zhang, Christopher Bohm, Brian W. Kunkle, Badri N. Vardarajan, Patrice L. Whitehead, Holly N Cukier, Richard Mayeux, Peter St George-Hyslop, Margaret A Pericak-Vance

17 Scopus citations

Abstract

Objective: To characterize the clinical and molecular effect of mutations in the sortilin-related receptor (SORL1) gene. Methods: We performed whole-exome sequencing in early-onset Alzheimer disease (EOAD) and late-onset Alzheimer disease (LOAD) families followed by functional studies of select variants. The phenotypic consequences associated with SORL1 mutations were characterized based on clinical reviews of medical records. Functional studies were completed to evaluate b-amyloid (Ab) production and amyloid precursor protein (APP) trafficking associated with SORL1 mutations. Results: SORL1 alterations were present in 2 EOAD families. In one, a SORL1 T588I change was identified in 4 individuals with AD, 2 of whom had parkinsonian features. In the second, an SORL1 T2134 alteration was found in 3 of 4 AD cases, one of whom had postmortem Lewy bodies. Among LOAD cases, 4 individuals with either SORL1 A528T or T947M alterations had parkinsonian features. Functionally, the variants weaken the interaction of the SORL1 protein with full-length APP, altering levels of Ab and interfering with APP trafficking. Conclusions: The findings from this study support an important role for SORL1 mutations in AD pathogenesis by way of altering Ab levels and interfering with APP trafficking. In addition, the presence of parkinsonian features among select individuals with AD and SORL1 mutations merits further investigation.

Original languageEnglish (US)
Article numbere116
JournalNeurology: Genetics
Volume2
Issue number6
DOIs
StatePublished - Jan 1 2016

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ASJC Scopus subject areas

  • Clinical Neurology
  • Genetics(clinical)

Cite this

SORL1 mutations in early- and late-onset Alzheimer disease. / Cuccaro, Michael; Carney, Regina M.; Zhang, Yalun; Bohm, Christopher; Kunkle, Brian W.; Vardarajan, Badri N.; Whitehead, Patrice L.; Cukier, Holly N; Mayeux, Richard; George-Hyslop, Peter St; Pericak-Vance, Margaret A.

In: Neurology: Genetics, Vol. 2, No. 6, e116, 01.01.2016.

Research output: Contribution to journalArticle