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Frontotemporal lobar degeneration (FTLD) can occur jointly with amyotrophic lateral sclerosis (ALS), and these 2 conditions share a genetic risk factor on chromosome 9. It has been reported that mutations in optineurin (OPTN) can cause ALS. Therefore, we sequenced OPTN in 371 FTLD cases but no mutations were detected, suggesting changes in OPTN do not cause FTLD.
Frontotemporal lobar degeneration with neuronal inclusions containing TAR DNA binding protein 43 (TDP-43) is associated in most cases with null-mutations in the progranulin gene (PGRN). While the mechanisms by which PGRN haploinsufficiency leads to neurodegeneration remained speculative, increasing evidence support the hypothesis that cell cycle reentry of postmitotic neurons precedes many instances...
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