ATF4 and Parkinson disease: To this end, we tested mRNA levels of sXBP1, BiP, ATF4, ATF6 and CHOP, along with phosphorylation of eIF2α in fibroblasts that originated from one N370S GBA1/G2019S LRRK2 PD patient, one N370S GBA1 PD patient and three G2019S LRRK2 PD patients.