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- W2080037001 abstract "Abstract Frontotemporal lobar degeneration ( FTLD ) is the second leading cause of dementia in individuals under age 65. In many patients, the predominant pathology includes neuronal cytoplasmic or intranuclear inclusions of ubiquitinated TAR DNA binding protein 43 ( FTLD ‐ TDP ). Recently, a genome‐wide association study identified the first FTLD ‐ TDP genetic risk factor, in which variants in and around the TMEM 106B gene (top SNP rs1990622) were significantly associated with FTLD ‐ TDP risk. Intriguingly, the most significant association was in FTLD ‐ TDP patients carrying progranulin ( GRN ) mutations. Here, we investigated to what extent the coding variant, rs3173615 (p.T185S) in linkage disequilibrium with rs1990622, affects progranulin protein ( PGRN ) biology and transmembrane protein 106 B (TMEM106B) regulation. First, we confirmed the association of TMEM 106B variants with FTLD ‐ TDP in a new cohort of GRN mutation carriers. We next generated and characterized a TMEM 106B‐specific antibody for investigation of this protein. Enzyme‐linked immunoassay analysis of progranulin protein levels showed similar effects upon T185 and S185 TMEM 106B over‐expression. However, over‐expression of T185 consistently led to higher TMEM 106B protein levels than S185. Cycloheximide treatment experiments revealed that S185 degrades faster than T185 TMEM 106B, potentially due to differences in N‐glycosylation at residue N183. Together, our results provide a potential mechanism by which TMEM 106B variants lead to differences in FTLD ‐ TDP risk. image We studied the p.T185S TMEM106B genetic variant previously implicated in frontotemporal dementia with TAR DNA binding protein 43 pathology caused by progranulin mutations. Our cell culture studies provide evidence that the protective S185 isoform is degraded more rapidly than T185 TMEM106B, potentially due to differences in glycosylation. These findings suggest that low TMEM106B levels might protect against FTLD‐TDP in these patients." @default.
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- W2080037001 date "2013-07-01" @default.
- W2080037001 modified "2023-10-16" @default.
- W2080037001 title "<scp>TMEM</scp>106B p.T185S regulates <scp>TMEM</scp>106B protein levels: implications for frontotemporal dementia" @default.
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- W2080037001 doi "https://doi.org/10.1111/jnc.12329" @default.
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