UPR pathway mediates HSPC failure in dhx15−/− zebrafish. A, qRT‐PCR analysis of CHOP, JUN, and ATF3 in dhx15+/+ and dhx15−/− zebrafish at 3 dpf. Each qRT‐PCR experiment was carried out in triplicates, and repeated at least three times. B‐E, WISH analysis of cmyb in dhx15+/+ and dhx15−/− zebrafish treated with 4‐PBA. P < .005, χ2 test. F‐I, WISH analysis of cmyb in dhx15+/+ and dhx15−/− zebrafish treated with toyocamycin. P < .005, χ2 test. Black arrow indicates caudal hematopoietic tissue. ***P < .0005. ATF3, activating transcription factor 3; dpf, days post fertilization; HSPC, hematopoietic stem/progenitor cell; qRT‐PCR, quantitative real‐time PCR; UPR, unfolded protein response pathway; WISH, whole‐mount in situ hybridization; 4‐PBA, 4‐phenylbutyric acid
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