X-chromosome-wide association study for Alzheimer's disease
Le Borgne, J.; Gomez, L.; Heikkinen, S.; Amin, N.; Ahmad, S.; Choi, S. H.; Bis, J.; Grenier-Boley, B.; Rodriguez, O. G.; Kleineidam, L.; Young, J.; Tripathi, K. P.; Wang, L.; Varma, A.; van der Lee, S.; Damotte, V.; de Rojas, I.; Palmal, S.; EADB, ; GR@ACE, ; DEGESCO, ; EADI, ; GERAD, ; DemGene, ; FinnGen, ; ADGC, ; CHARGE, ; Giedraitis, V.; Ghidoni, R.; Fernandez, V.; Kehoe, P. G.; Frikke-Schmidt, R.; Tsolaki, M.; Sanchez-Juan, P.; Sleegers, K.; Ingelsson, M.; Haines, J.; Farrer, L.; Mayeux, R.; Wang, L.-S.; Sims, R.; DeStefano, A.; Schellenberg, G. D.; Seshadri, S.; Amouyel, P.; Wil
Show abstract
Due to methodological reasons, the X-chromosome has not been featured in the major genome-wide association studies on Alzheimers Disease (AD). To finally address this and better characterize the genetic landscape of AD, we performed an in-depth X-Chromosome-Wide Association Study (XWAS) in 115,841 AD cases or AD proxy cases, including 52,214 clinically-diagnosed AD cases, and 613,671 controls. We considered three approaches to account for the different X-chromosome inactivation (XCI) states in females, i.e. random XCI, skewed XCI, and escape XCI. We did not detect any genome-wide significant signals (P [≤] 5 x 10-8) but identified four X-chromosome-wide significant loci (P [≤] 1.7 x 10-6). Two signals locate in the FRMPD4 and DMD genes, while the two others are more than 300 kb away from the closest protein coding genes NLGN4X and GRIA3. Overall, this XWAS found no common genetic risk factors for AD on the non-pseudoautosomal region of the X-chromosome, but it identified suggestive signals warranting further investigations.
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