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Zebrafish KLF4 is essential for anterior mesendoderm/pre-polster differentiation and hatching
Melissa R Gardiner1, David F Daggett, Leonard I Zon
1Queensland Institute for Molecular Bioscience, University of Queensland, Brisbane, Australia.
Summary
Zebrafish Krüppel-like factor 4 (zKLF4) is crucial for hatching gland development. Knockdown of zKLF4 prevents hatching gland formation and subsequent hatching in zebrafish embryos.
Area of Science:
- Developmental Biology
- Genetics
- Zebrafish Model Organisms
Background:
- Krüppel-like factors (KLFs) are essential for organogenesis in mice.
- Zebrafish KLF family members were identified, including zebrafish KLF4 (zKLF4), a homolog of Xenopus laevis neptune.
- zKLF4 expression begins in the pre-polster, an early mesendodermal cell population.
Purpose of the Study:
- To investigate the function of zKLF4 in zebrafish development.
- To determine the role of zKLF4 in the formation of the hatching gland.
Main Methods:
- Morpholino-based antisense oligonucleotides were used to knock down zKLF4 expression in zebrafish embryos.
- Expression levels of pre-polster/anterior mesendoderm markers (CatL, cap1, BMP4) were analyzed.
Main Results:
- Knockdown of zKLF4 led to a complete absence of hatching gland formation.
- Subsequent zebrafish embryo hatching was also abolished.
- Early knockdown of pre-polster/anterior mesendoderm markers (CatL, cap1, BMP4) was observed.
Conclusions:
- zKLF4 is expressed in the pre-polster, an early mesendodermal site.
- zKLF4 plays a critical role in the differentiation of pre-polster cells into hatching gland cells.
- zKLF4 is essential for zebrafish embryonic hatching.