The function of ATXN7 (ataxin 7, Ensembl gene identifier ENSG00000163635) is as follows. Acts as a component of the SAGA (aka STAGA) transcription coactivator-HAT complex (PubMed:15932940, PubMed:18206972). Mediates the interaction of SAGA complex with the CRX and is involved in CRX- dependent gene activation (PubMed:15932940, PubMed:18206972). Probably involved in tethering the deubiquitination module within the SAGA complex (PubMed:24493646). Necessary for microtubule cytoskeleton stabilization (PubMed:22100762). Involved in neurodegeneration (PubMed:9288099). {ECO:0000269|PubMed:15932940, ECO:0000269|PubMed:18206972, ECO:0000269|PubMed:22100762, ECO:0000269|PubMed:24493646, ECO:0000269|PubMed:9288099}.