eLife assessment
Black et al., provide evidence that levels of Paternally Expressed Gene 10 (PEG10) protein are regulated by Ubqln2 and that proteolytic fragments from PEG10 cleavage induce changes in gene expression, in particular genes that encode proteins involved in axon biology. Based on these data and the finding of an increase in PEG10 levels and alterations of proteins regulated by PEG10 in the spinal cord of ALS patients, they propose that abnormal induction of PEG10-regulated genes is involved in ALS. However, the evidence for these claims and PEG10 involvement could be strengthened, and the rigor of the work could be enhanced in places.