Discovery provides potential clues for Lewy body and frontotemporal dementias. In a collaborative effort between the National Institutes of Health's National Institute of Neurological Disorders and Stroke (NINDS) and National Institute on Aging (NIA), scientists have discovered new genetic risk fac
. The project was a collaborative effort between scientists at the National Institute of Neurological Disorders and Stroke and the National Institute on Aging at NIH.
“If you imagine that our entire genetic code is a book, a structural variant would be a paragraph, page, or even an entire chapter that has been removed, duplicated, or inserted in the wrong place,” said Sonja W. Scholz, M.D., Ph.D., investigator in the neurogenetics branch of NINDS and senior author of this study.
A previously unknown variant in the gene TCPN1 was found in samples from patients with LBD, a disease, that like Parkinson’s disease, is associated with abnormal deposits of the protein alpha-synuclein in the brain. This variant, in which more than 300 nucleotides are deleted from the gene, is associated with a higher risk for developing LBD.
By looking at a group of 50 genes implicated in inherited neurodegenerative diseases, the investigators were able to identify additional rare structural variants, including several that are known to cause disease. The analyses also identified two well-established risk factors for FTD changes in the C9orf72 and MAPT genes. These proof-of-concept findings bolstered the strength of the study’s new findings by demonstrating that the algorithms were properly working.
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