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ZFIN ID: ZDB-FIG-130911-27
Baas et al., 2012 - CKIP-1 regulates mammalian and zebrafish myoblast fusion. Journal of Cell Science   125(16):3790-3800 Full text @ J. Cell Sci.
Knockdown Reagent:
Anatomical Terms:
Stage Range: 5-9 somites to Prim-5
Knockdown Reagent:
Observed In:
Stage Range: 14-19 somites to Prim-5

Fig. 2 Ckip-1 knock down impairs fast-twitch muscle precursor fusion. (A) Confocal image of Ckip-1 distribution in fast-twitch precursor cells, in an 8- to 10-somite embryo. Membranes were labelled using beta-catenin staining and nuclei with DAPI. Ckip-1 accumulates at the periphery of fast precursor cells. Dorsal view, anterior to the top. Scale bar: 5µm. (B) All panels (side view, anterior to the left) are confocal images showing myocytes in three somites, in 24 hpf embryos injected at the 1-cell stage with ckip-1 or control morpholinos and subsequently reinjected with membrane-mCherry mRNA at the 16- to 32-cell stage for membrane scatter labelling. Embryos were labelled with anti-Prox1 that stains slow fibre nuclei (green) and DAPI (blue). Prox1-positive nuclei were delineated and coloured green to be more visible. The Roman numerals above a somite indicate its positioning along the anterior–posterior axis (with I designating the anterior-most somite). Two images are shown for each embryo, one at the periphery of the myotome (lateral) and one at the level of the notochord (NC; medial). In morphant embryos, myosepta are delineated in white. Scale bars: 25µm. The membrane-mCherry staining was used to outline cells in confocal z-stacks (10–15 focal planes scanning the entire myotome), in order to count their nuclei. (C) Quantification of B, presented as the percentage of fused cells, i.e. containing more than one nucleus. Roman numerals under the bars indicate the analysed somite region. Values are means ± s.e.m. of six different morphant and control embryos. An average of 500 mCherry-positive cells was counted for each embryo. Whereas slow muscle fibres have reached the lateral myotome in the analysed regions (B), the fusion percentage is very low in ckip-1 morphants compared to controls, including in more anterior (more differentiated) somites (C). (D) Confocal images (mid-trunk, anterior to the left) encompassing a two-somite width view of 18 hpf embryos injected with Ckip-1-MO or control MO and mCherry mRNA, labelled with DAPI (blue). Arrows show short and elongating cells in 18 hpf Ckip-1 MO- and control-MO-injected embryos, respectively. Whereas in wild-type embryos, short fast muscle precursor cells elongate and intercalate along the anteroposterior axis, they remained irregular and most of them did not extend protrusions in the direction of elongation and between other cells. Scale bars: 25µm. (E) Confocal images showing a lateral view of two somites in 18 hpf Ckip-1-MO- and control-MO-injected embryos labelled for fast MyHC (F310; red) and DAPI (blue). Mid-trunk, anterior to the left. Scale bars: 25µm. Ckip-1 knock down does not interfere with differentiation.

Gene Expression Details
Gene Antibody Fish Conditions Stage Anatomy Assay
ctnnb1 WT standard conditions 5-9 somites fast muscle myoblast plasma membrane IHC
plekho1b Ab1-plekho1b WT standard conditions 5-9 somites fast muscle myoblast cell periphery IHC
prox1a WT control Prim-5 slow muscle cell nucleus IHC
WT + MO1-plekho1b standard conditions Prim-5 slow muscle cell nucleus IHC
Antibody Labeling Details
Antibody Assay Fish Conditions Stage Anatomy
Ab-F310 IHC WT control 14-19 somites fast muscle myoblast
IHC WT + MO1-plekho1b standard conditions 14-19 somites fast muscle myoblast
Phenotype Details
Fish Conditions Stage Phenotype
WT + MO1-plekho1b standard conditions 14-19 somites fast muscle myoblast irregular spatial pattern, abnormal
14-19 somites fast muscle myoblast morphology, abnormal
Prim-5 fast muscle cell mononucleate, abnormal
Prim-5 fast muscle myoblast unfused from fast muscle myoblast, abnormal
Prim-5 myoblast fusion decreased occurrence, abnormal
ZFIN wishes to thank the journal Journal of Cell Science for permission to reproduce figures from this article. Please note that this material may be protected by copyright. Full text @ J. Cell Sci.