Genetic modifiers in carriers of repeat expansions in the C9ORF72 gene.
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van Blitterswijk Marka, Mullen Bianca, Wojtas Aleksandra, Heckman Michael G, Diehl Nancy N, Baker Matthew C, DeJesus-Hernandez Mariely, Brown Patricia H, Murray Melissa E, Hsiung Ging-Yuek R, Stewart Heather, Karydas Anna M, Finger Elizabeth, Kertesz Andrew, Bigio Eileen H, Weintraub Sandra, Mesulam Marsel, Hatanpaa Kimmo J, White Charles L, Neumann Manuela, Strong Michael J, Beach Thomas G, Wszolek Zbigniew K, Lippa Carol, Caselli Richard, Petrucelli Leonard, Josephs Keith A, Parisi Joseph E, Knopman David S, Petersen Ronald C, Mackenzie Ian R, Seeley William W, Grinberg Lea T, Miller Bruce L, Boylan Kevin B, Graff-Radford Neill R, Boeve Bradley F, Dickson Dennis W, Rademakers Rosa
Аннотация
RESULTS: We examined a cohort of 330 C9ORF72 expansion carriers and 374 controls. In these individuals, we assessed variants previously implicated in FTD and/or MND; 36 variants were included in our analysis. After adjustment for multiple testing, our analysis revealed three variants significantly associated with age at onset (rs7018487 [UBAP1; p-value = 0.003], rs6052771 [PRNP; p-value = 0.003], and rs7403881 [MT-Ie; p-value = 0.003]), and six variants significantly associated with survival after onset (rs5848 [GRN; p-value = 0.001], rs7403881 [MT-Ie; p-value = 0.001], rs13268953 [ELP3; p-value = 0.003], the epsilon 4 allele [APOE; p-value = 0.004], rs12608932 [UNC13A; p-value = 0.003], and rs1800435 [ALAD; p-value = 0.003]).
CONCLUSIONS: Variants identified through this study were previously reported to be involved in FTD and/or MND, but we are the first to describe their effects as potential disease modifiers in the presence of a clear pathogenic mutation (i.e. C9ORF72 repeat expansion). Although validation of our findings is necessary, these variants highlight the importance of protein degradation, antioxidant defense and RNA-processing pathways, and additionally, they are promising targets for the development of therapeutic strategies and prognostic tests.