The PPP1R15A (GADD34) gene is transcribed to yield mRNA (Hollander et al. 1997, Hollander et al. 2001, Oh-Hashi et al. 2001, and inferred from the mouse homolog). Transcription of PPP1R15A is activated by ATF4, which binds the PPP1R15A promoter in response to certain stresses such as endoplasmic reticulum stress, traumatic brain injury, and heme deficiency (inferred from mouse homologs).