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Skeletal analysis and differential gene expression in Runx2/Osterix double heterozygous embryos.

Abstract：

:The transcription factors, Runx2 and Osterix (Osx), act downstream in the BMP2 pathway, and they are essential for osteoblast differentiation and bone formation. While Runx2 expression is normal in Osx-null mice, Osx is not expressed in Runx2-null mice, indicating that Osx acts downstream of Runx2 during bone formation. Runx2 and Osx are also independently regulated during bone formation. To define the unknown correlation between Runx2 and Osx in the regulation of bone formation, we analyzed the bone of Runx2/Osx double heterozygotes generated by mating heterozygous Runx2 and Osx mice and elucidated the differential gene expressions due to the lack of Runx2 and Osx in bone. Compared to the Runx2 and Osx heterozygous embryos, Runx2/Osx double heterozygous embryos showed reduced bone length in the humerus and femur as well as hypoplastic or complete absence of the maxillary and palatine shelf, presphenoid bone, zygomatic bone, and tympanic ring. Severe inward bending was observed in the ribs and humerus. Histological analysis showed an expanded region of hypertrophic chondrocytes and a reduced area of mineralized bones in the Runx2/Osx double heterozygous embryos. DNA microarray analysis of the calvaria of embryos allowed gene classification based on similarities in the upregulated and downregulated expression patterns. Clusters 1 and 2 include 68 downregulated genes and 18 upregulated genes, respectively, in the Runx2/Osx double heterozygous embryos. Finally, the skeletal analysis and gene expression profiles obtained by clustering may facilitate the understanding of the correlation between Runx2 and Osx in skeletal development.

journal_name

Biochem Biophys Res Commun

journal_title

Biochemical and biophysical research communications

authors

Baek JE,Choi JY,Kim JE

doi

10.1016/j.bbrc.2014.08.010

subject

Has Abstract

pub_date

2014-08-29 00:00:00

pages

442-8

issue

3

eissn

0006-291X

issn

1090-2104

pii

S0006-291X(14)01416-8

journal_volume

451

pub_type

杂志文章

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