Validation of next-generation sequencing technologies in genetic diagnosis of dementia

Neurobiology of Aging
John BeckSimon Mead

Abstract

Identification of a specific genetic cause of early onset dementia (EOD) is important but can be difficult because of pleiotropy, locus heterogeneity and accessibility of gene tests. Here we assess the use of next generation sequencing (NGS) technologies as a quick, accurate and cost effective method to determine genetic diagnosis in EOD. We developed gene panel based technologies to assess 16 genes known to harbour mutations causal of dementia and combined these with PCR based assessments of the C9orf72 hexanucleotide repeat expansion and the octapeptide repeat region of PRNP. In a blinded study of 95 samples we show very high sensitivity and specificity are achievable using either Ion Torrent or MiSeq sequencing platforms. Modifications to the gene panel permit accurate detection of structural variation in APP. In 2/10 samples which had been selected because they possess a variant of uncertain significance the new technology discovered a causal mutation in genes not previously sequenced. A large proportion (23/85) of samples showed genetic variants of uncertain significance in addition to known mutations. The MRC Dementia Gene Panel and similar technologies are likely to be transformational in EOD diagnosis with a significant...Continue Reading

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Related Concepts

Senile Paranoid Dementia
C9orf72 protein, human
APP protein, human
Exons
Pathogenic Organism
Gene Products, Protein
Gene Deletion Abnormality
Macrophage Colony-Stimulating Factor Receptor
Sequencing
Massively-Parallel Sequencing

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