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A novel CCM2 variant in a family with non-progressive cognitive complaints and cerebral microbleeds

Cohn-Hokke, PE; Holstege, H; Weiss, MM; van der Flier, WM; Barkhof, F; Sistermans, EA; Pijnenburg, YA; ... Scheltens, P; + view all (2016) A novel CCM2 variant in a family with non-progressive cognitive complaints and cerebral microbleeds. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics , 174 (3) pp. 220-226. 10.1002/ajmg.b.32468. Green open access

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Abstract

Lobar cerebral microbleeds are most often sporadic and associated with Alzheimer's disease. The aim of our study was to identify the underlying genetic defect in a family with cognitive complaints and multiple lobar microbleeds and a positive family history for early onset Alzheimer's disease. We performed exome sequencing followed by Sanger sequencing for validation purposes on genomic DNA of three siblings with cognitive complaints, reduced amyloid-beta-42 in CSF and multiple cerebral lobar microbleeds. We checked for the occurrence of the variant in a cohort of 363 patients with early onset dementia and/or microbleeds. A novel frameshift variant (c.236_237delAC) generating a premature stop codon in the CCM2 gene shared by all three siblings was identified. Pathogenicity of the variant was supported by the presence of cerebral cavernous malformations in two of the siblings and by the absence of the variant exome variant databases. Two siblings were homozygous for APOE-ϵ4; one heterozygous. The cognitive complaints, reduced amyloid-beta-42 in CSF and microbleeds suggest preclinical Alzheimer's disease, but the stability of the cognitive complaints does not. We hypothesize that the phenotype in this family may be due to a combination of the CCM2 variant and the APOE status. © 2016 The Authors. American Journal of Medical Genetics Part B: Neuropsychiatric Genetics Published by Wiley Periodicals, Inc.

Type: Article
Title: A novel CCM2 variant in a family with non-progressive cognitive complaints and cerebral microbleeds
Location: United States
Open access status: An open access version is available from UCL Discovery
DOI: 10.1002/ajmg.b.32468
Publisher version: http://dx.doi.org/10.1002/ajmg.b.32468
Language: English
Additional information: This is an open access article under the terms of the Creative Commons Attribution-NonCommercial License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited and is not used for commercial purposes.
Keywords: Cavernoma, cerebral cavernous malformations, cognitive impairment, familial clustering, genetics
UCL classification: UCL
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology
UCL > Provost and Vice Provost Offices > School of Life and Medical Sciences > Faculty of Brain Sciences > UCL Queen Square Institute of Neurology > Brain Repair and Rehabilitation
URI: https://discovery.ucl.ac.uk/id/eprint/1500678
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