Pericak-Vance, Margaret A.

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TMEM106B is associated with frontotemporal lobar degeneration in a clinically diagnosed patient cohort.

Julie van der Zee; Tim Van Langenhove; Gernot Kleinberger; Kristel Sleegers; Sebastiaan Engelborghs; Rik Vandenberghe; Patrick Santens; Marleen Van den Broeck; Geert Joris; Jolien Brys; et al. (Profiled Author: Van Broeckhoven, Christine)

Neurodegenerative Brain Disease Group, VIB Department of Molecular Genetics, University of Antwerp-CDE, Universiteitsplein 1, 2610 Antwerpen, Belgium.
Brain : a journal of neurology 2011;134(Pt 3):808-15.

In a genome-wide association study of frontotemporal lobar degeneration with pathological inclusions of TAR DNA-binding protein, significant association was obtained with three single nucleotide polymorphisms at 7p21.3, in a region encompassing the gene TMEM106B. This study also suggested a potential modifying effect of TMEM106B on disease since the association was strongest in progranulin mutation carriers. Further, the risk effect seemed to correlate with increased TMEM106B expression in patients. In the present study, we sought to replicate these three findings using an independent Flanders-Belgian cohort of primarily clinically diagnosed patients with frontotemporal lobar degeneration (n = 288). We were able to confirm the association with TMEM106B with a P-value of 0.008 for rs1990622, the top marker from the genome-wide association study [odds ratio 0.75 (95% confidence interval 0.61-0.93)]. Further, high-density single nucleotide polymorphism mapping suggested that the association was solely driven by the gene TMEM106B. Homozygous carriers of the TMEM106B protective alleles had a 50% reduced risk of developing frontotemporal lobar degeneration. However, we were unable to detect a modifying effect of the TMEM106B single nucleotide polymorphisms on onset age in progranulin mutation carriers belonging to an extended, clinical and pathological well-documented founder family segregating a progranulin null mutation. Also, we could not observe significant differences in messenger RNA expression between patients and control individuals in lymphoblast cell lines and in brain frontal cortex. In conclusion, we replicated the genetic TMEM106B association in a primarily clinically diagnosed cohort of patients with frontotemporal lobar degeneration from Flanders-Belgium. Additional studies are needed to unravel the molecular role of TMEM106B in disease onset and pathogenesis.

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