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J Alzheimers Dis. 2016 Sep 6;54(2):717-21. doi: 10.3233/JAD-160185.

Non Fluent Variant of Primary Progressive Aphasia Due to the Novel GRN g.9543delA(IVS3-2delA) Mutation.

Author information

1
Neurology Unit, Department of Pathophysiology and Transplantation, University of Milan, Fondazione Ca' Granda, IRCCS Ospedale Policlinico, Milan, Italy.
2
Department of Neurosciences, University of Parma, Parma, Italy.
3
Center for Cognitive Disorders and Dementia (CDCD), AUSL, Parma, Italy.

Abstract

Mutations in progranulin gene (GRN) are a common cause of autosomal dominant frontotemporal lobar degeneration syndromes and are associated with a wide phenotypic heterogeneity. The majority of genetic defects in GRN consists of loss-of-function mutations, causing haploinsufficiency, and is associated with extremely low plasma progranulin levels. Herein, we describe a patient who developed language dysfunctions and memory disturbances at 63 years of age. Considering the early onset and the positive family history (sister aged 50 with non-fluent/agrammatic variant of primary progressive aphasia, father with behavioral disturbances in his sixties), a genetic analysis was carried out, showing the presence of a novel mutation [g.9543delA (IVS3-2delA)] in a predicted splicing site of GRN. Her progranulin plasma levels were under the reference threshold, as in her sister, thus supporting the causative role of the new variant. The same genetic mutation was confirmed by sequencing in her sister. Results described enlarge current knowledge on genetic causes of the disease and clinical characteristics of carriers.

KEYWORDS:

Deletion; frontotemporal dementia; haploinsufficiency; mutation; non-fluent variant primary progressive aphasia; progranulin (GRN); splicing

PMID:
27567822
DOI:
10.3233/JAD-160185
[Indexed for MEDLINE]

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