Fig. 6
DHX15 R222G is not as effective as DHX15 in restoring HSPC failure in dhx15?/? zebrafish. A, cmyb expression of wildtype zebrafish at 3 dpf. B, B?, cmyb expression of Dhx15?/?; Tg(hsp: DHX15) zebrafish at 3 dpf with (B?) or without (B) heat?shock treatment. HSPC failure was rescued after DHX15 overexpression in dhx15?/? zebrafish (P < .0001, ?2 test). C?C??, cmyb expression of Dhx15?/?; Tg(hsp: DHX15 R222G) zebrafish at 3 dpf with (C?, C??) or without (C) HS treatment. HSPC failure was rescued after DHX15 R222G overexpression in dhx15?/? zebrafish (P < .05, ?2 test). DHX15 R222G is not as effective as DHX15 in restoring HSPC failure in dhx15?/? zebrafish. (No HS vs HS, P < .05, ?2 test; No HS vs HSL, P < .0001, ?2 test; HS vs HSL, P < .005, ?2 test). D, Western blot analysis of DHX15 protein expression in DHX15/DHX15 R222G transgenic zebrafish with or without heat activation. DHX15, Dhx15?/?; Tg(hsp: DHX15); DHX15 R222G, Dhx15?/? ; Tg(hsp: DHX15 R222G); dpf, days post fertilization; hpf, hours post fertilization; HS, heat?shocked at 38? for 1 h and 45 min once a day since 25 hpf; HSL, heat?shocked at 38? for 2 h once a day since 25 hpf; HSPC, hematopoietic stem/progenitor cell; No HS, without heat?shock treatment. Black arrow indicates caudal hematopoietic tissue