Abstract:
PURPOSE:To understand the role of the angiopoietin-like 6 gene (ANGPTL6) in intracranial aneurysms (IAs), we investigated its role in a large cohort of familial IAs. METHODS:Individuals with family history of IA were recruited to the Genetic and Observational Subarachnoid Haemorrhage (GOSH) study. The ANGPTL6 gene was sequenced using Sanger sequencing. Identified genetic variants were compared to a control population. RESULTS:We found 6 rare ANGPTL6 genetic variants in 9/275 individuals with a family history of IA (3.3%) (5 missense mutations and 1 nonsense mutation leading to a premature stop codon), none present in controls. One of these had been previously reported: c.392A>T (p.Glu131Val) on exon 2; another was very close: c.332G>A (p.Arg111His). Two further genetic variants lie within the fibrinogen-like domain of the ANGPTL6 gene, which may influence function or level of the ANGPTL6 protein. The last 2 missense mutations lie within the coiled-coil domain of the ANGPTL6 protein. All genetic variants were well conserved across species. CONCLUSION:ANGPTL6 genetic variants are an important cause of IA. Defective or lack of ANGPTL6 protein is therefore an important factor in blood vessel proliferation leading to IA; dysfunction of this protein is likely to cause abnormal proliferation or weakness of vessel walls. With these data, not only do we emphasize the importance of screening familial IA cases for ANGPTL6 and other genes involved in IA, but also highlight the ANGPTL6 pathway as a potential therapeutic target. CLASSIFICATION OF EVIDENCE:This is a Class III study showing some specificity of presence of the ANGPTL6 gene variant as a marker of familial intracranial aneurysms in a small subset of individuals with familial aneurysms.
journal_name
Neurologyjournal_title
Neurologyauthors
Hostettler IC,O'Callaghan B,Bugiardini E,O'Connor E,Vandrovcova J,Davagnanam I,Alg V,Bonner S,Walsh D,Bulters D,Kitchen N,Brown MM,Grieve J,Werring DJ,Houlden H,Genetics and Observational Subarachnoid Haemorrhage (GOSH) Studoi
10.1212/WNL.0000000000011125subject
Has Abstractpub_date
2020-10-26 00:00:00eissn
0028-3878issn
1526-632Xpii
WNL.0000000000011125pub_type
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