A global team of scientists discovered a genetic risk factor for early-onset frontotemporal dementia, specifically aFTLD-U. This condition, characterized by abnormal protein aggregation, has been poorly understood. The study involved a genome-wide association analysis of 59 patients and over 3,100 controls, revealing a risk locus on chromosome 15 that increases disease odds by more than 26-fold. The research utilized long-read genomic sequencing to identify an expanded DNA repeat in the GOLGA8A gene, marking a significant advancement in understanding this rare dementia.
"Using a genome-wide association study of 59 individuals with aFTLD-U and more than 3,100 control subjects, the investigators identified a risk locus, or location, on chromosome 15. This genetic variant increased the odds of developing the disease more than 26-fold - an exceptionally strong effect in the context of neurodegenerative disorders, where most genetic risk factors only slightly increase susceptibility."
"The main finding is that of a novel genetic alteration which requires 'long-read genomic sequencing' to identify - this type of sequencing allows interrogation of non-coding segments of DNA."
"By leveraging long-read sequencing data and analyzing DNA structures often invisible to conventional methods, the scientists identified an expanded DNA repeat within the gene GOLGA8A."
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