FIGURE

Fig. 4

ID

ZDB-FIG-180222-21

Publication

Akerberg et al., 2017 - Histone demethylases Kdm6ba and Kdm6bb redundantly promote cardiomyocyte proliferation during zebrafish heart ventricle maturation

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Fig. 4

Kdm6ba and kdm6bb redundantly promote cardiac trabeculation. (A, C) Fluorescent imaged whole mount 72 hpf embryos showing the aortic arch arteries of control and kdm6b-deficient Tg(kdrl:EGFP) animals. (B, D) Confocal heart images of whole mount 72 hpf Tg(myl7:DsRed-nuc)larvae antibody stained for DsRed (red, cardiomyocyte nuclei) and cardiac troponin (CT3, heart muscle). Control and combined kdm6ba/kdm6bb-deficient larvae are shown. (E) Bar graphs comparing the absolute number of atrial and ventricular cardiomyocytes between 72 hpf control (kdm6ba^+/-; kdm6bb^+/- and kdm6ba^+/+; kdm6bb^+/-) and kdm6ba^-/-; kdm6bb^-/- larvae. Error bars represent one standard deviation (n=6 control and 7 kdm6ba/bb-deficient fish from two clutches). (F, G) DIC microscopy images showing the OFT and ventricle of control and kdm6b-deficient embryos at 5 dpf. Dashed yellow lines outline the OFT valves. (H, I) Whole mount confocal imaged hearts of immunostained 5 dpf control and kdm6ba^-/-; kdm6bb^-/- larvae. These Tg(myl7:DsRed-nuc) fish are stained with anti-DsRed (red, cardiomyocyte nuclei) and anti-cardiac troponin (CT3, green) antibodies. (J-M) H&E stained sagittal sections through the heart of 5 and 7 dpf control and kdm6ba^-/-; kdm6bb^-/- larvae. Solid lines outline the trabeculae and dashed yellow lines indicate the AVC valves. (N, O) Scatterplot graphs showing the normalized outer curvature ventricular sectional area and trabeculation extent (“index”) of 5 and 7 dpf control compared to clutch mate kdm6ba^-/-; kdm6bb^-/- larvae. Each data point represents one animal. P-values are from Student's two-tailed t-tests. (P) Bar graph of qRT-PCR data comparing kdm6ba and kdm6bb to vmhcl transcript levels using three pools of isolated 3 dpf zebrafish embryonic hearts (normalized to vmhcl levels). Error bars are one standard deviation.

Expression Data

Genes:	kdm6ba kdm6bb
Fish:	AB
Anatomical Term:	heart
Stage:	Protruding-mouth

Expression Detail

Antibody Labeling

Phenotype Data

Fish:	kdm6ba^b1308/b1308; kdm6bb^b1307/b1307 kdm6ba^b1308/b1308; kdm6bb^b1307/b1307; hsc4Tg kdm6ba^b1308/b1308; kdm6bb^b1307/b1307; s843Tg
Observed In:	atrium cardiac muscle cell bulbus arteriosus cardiac ventricle cardiac ventricle cardiac muscle cell heart trabecula formation
Stage Range:	Protruding-mouth to Days 7-13

Phenotype Detail

Acknowledgments

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Reprinted from Developmental Biology, 426(1), Akerberg, A.A., Henner, A., Stewart, S., Stankunas, K., Histone demethylases Kdm6ba and Kdm6bb redundantly promote cardiomyocyte proliferation during zebrafish heart ventricle maturation, 84-96, Copyright (2017) with permission from Elsevier. Full text @ Dev. Biol.