Fig. 1

Inhibition of Myo1 arrests cell division and affected blastomere shapeof Zebrafish embryos.

Schematic representation of Myo1 domain structures. (A) Semiquantitative RT-PCR profiles from cDNA and RNA templates. For Myo1Ea&b, control (top panel) and with PClP (bottom panel), were compared at 1–4 and 64 cells stages for cDNA and RNA templates, (B) Semiquantitative RT-PCR profiles from cDNA and RNA templates. For Myo1Cb, control (top panel) and with PClP (bottom panel), were compared at 1–4 and 64 cells for cDNA and RNA templates. (C) (i) Western blot for Myo1C relative-levels at 1–4 and 64 cell stages. Control (top panel) and with PClP (bottom panel), GAPDH used as loading control. (ii) Relative change in levels of Myo1C ±PClP, 1–4 and 64 cell stages, control grey, PClP black. Error bars indicate SD, n = 3. (D) (i) Top panel, control embryos at different developmental stages. Bottom panel, PClP treated embryos taken in identical time as in control, dotted line shows boundary between yolk and blastodisc in both panels, (ii) measurement of changes in blastodisk thickness, as indicated by vertical both sided arrows in(Ei) with time, approximately along first cleavage furrow in both, the control (dotted line) and PClP treated embryos (solid line), n = 8, error indicate SD. Black arrow-head in time axis indicates PClP addition. Embryos were observed in lateral or side view position. (E) DAPI stained nucleus profile of 64-cell control (2 hpf) (top panel) and equivalent 2 hpf PClP inhibited 8- cell embryo (middle panel). 1 hpf control 8- cell embryo, showing divided nucleus is also shown (lower panel). bar 120μm in all places.