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2015 ; 35
(8
): 1449-61
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YAP regulates the expression of Hoxa1 and Hoxc13 in mouse and human oral and skin
epithelial tissues
#MMPMID25691658
Liu M
; Zhao S
; Lin Q
; Wang XP
Mol Cell Biol
2015[Apr]; 35
(8
): 1449-61
PMID25691658
show ga
Yes-associated protein (YAP) is a Hippo signaling transcriptional coactivator
that plays pivotal roles in stem cell proliferation, organ size control, and
tumor development. The downstream targets of YAP have been shown to be highly
context dependent. In this study, we used the embryonic mouse tooth germ as a
tool to search for the downstream targets of YAP in ectoderm-derived tissues. Yap
deficiency in the dental epithelium resulted in a small tooth germ with reduced
epithelial cell proliferation. We compared the gene expression profiles of
embryonic day 14.5 (E14.5) Yap conditional knockout and YAP transgenic mouse
tooth germs using transcriptome sequencing (RNA-Seq) and further confirmed the
differentially expressed genes using real-time PCR and in situ hybridization. We
found that YAP regulates the expression of Hoxa1 and Hoxc13 in oral and dental
epithelial tissues as well as in the epidermis of skin during embryonic and adult
stages. Sphere formation assay suggested that Hoxa1 and Hoxc13 are functionally
involved in YAP-regulated epithelial progenitor cell proliferation, and chromatin
immunoprecipitation (ChIP) assay implies that YAP may regulate Hoxa1 and Hoxc13
expression through TEAD transcription factors. These results provide mechanistic
insights into abnormal YAP activities in mice and humans.