Up-regulated by inducers of the unfolded protein response (UPR), including tunicamycin and thapsigargin. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay. May be produced at very low levels due to a premature stop codon in the mRNA, leading to nonsense-mediated mRNA decay. Belongs to the TMEM241 family.