Differential enrichment of retinal ganglion cells underlies proposed core neurodegenerative transcription programs
In a published Correction, a revised analysis updated two "core transcription programs" proposed to underlie axon injury-induced retinal ganglion cell (RGC) neurodegeneration. Though extensive, the Correction purported to leave the two principal conclusions of its parent study unaltered. The first of those findings was that a core program mediated by the Activating Transcription Factor-4 (ATF4) and its likely heterodimeric partner does not include numerous canonical ATF4 target genes stimulated by RGC axon injury. The second was that the Activating Transcription Factor-3 (ATF3) and C/EBP Homologous Protein (CHOP) function with unprecedented coordination in a parallel program regulating innate immunity pathways. Here those unexpected findings are revealed to instead reflect insufficient knockout coupled with differences in RGC enrichment across conditions. This analysis expands on the published Correction's redefinition of the purported transcription programs to raise foundational questions about the proposed functions and relationships of these transcription factors in neurodegeneration.