The endogenous TBPH coding region is replaced with fly codon-optimized Hsap\TARDBP cDNA with an N-terminal Tag:FLAG tag and a Disc\RFPDsRed.3xP3.cUa marker flanked by loxP sites at the C-terminal. The Hsap\TARDBP cDNA contains a familial Amyotrophic Lateral Sclerosis-associated mutation (Q331K) and is expressed under the control of the endogenous TBPH regulatory regions.