A Cbfa1-dependent genetic pathway controls bone formation beyond embryonic development
- Patricia Ducy,
- Michael Starbuck,
- Matthias Priemel,
- Jianhe Shen,
- Gerald Pinero,
- Valerie Geoffroy,
- Michael Amling, and
- Gerard Karsenty
- Department of Molecular and Human Genetics and Program in Developmental Biology, Baylor College of Medicine, Houston, Texas 77030 USA; Department of Molecular Genetics, The University of Texas M.D. Anderson Cancer Center, Houston, Texas 77030 USA; Department of Bone Pathology and Department of Trauma Surgery, University of Hamburg, Hamburg 20246, Germany; Department of Basic Science, The University of Texas Dental Branch, Houston, Texas 77030 USA
Abstract
The molecular mechanisms controlling bone extracellular matrix (ECM) deposition by differentiated osteoblasts in postnatal life, called hereafter bone formation, are unknown. This contrasts with the growing knowledge about the genetic control of osteoblast differentiation during embryonic development. Cbfa1, a transcriptional activator of osteoblast differentiation during embryonic development, is also expressed in differentiated osteoblasts postnatally. The perinatal lethality occurring in Cbfa1-deficient mice has prevented so far the study of its function after birth. To determine if Cbfa1 plays a role during bone formation we generated transgenic mice overexpressing Cbfa1 DNA-binding domain (ΔCbfa1) in differentiated osteoblasts only postnatally. ΔCbfa1 has a higher affinity for DNA than Cbfa1 itself, has no transcriptional activity on its own, and can act in a dominant-negative manner in DNA cotransfection assays. ΔCbfa1-expressing mice have a normal skeleton at birth but develop an osteopenic phenotype thereafter. Dynamic histomorphometric studies show that this phenotype is caused by a major decrease in the bone formation rate in the face of a normal number of osteoblasts thus indicating that once osteoblasts are differentiated Cbfa1 regulates their function. Molecular analyses reveal that the expression of the genes expressed in osteoblasts and encoding bone ECM proteins is nearly abolished in transgenic mice, and ex vivo assays demonstrated that ΔCbfa1-expressing osteoblasts were less active than wild-type osteoblasts. We also show that Cbfa1 regulates positively the activity of its own promoter, which has the highest affinity Cbfa1-binding sites characterized. This study demonstrates that beyond its differentiation function Cbfa1 is the first transcriptional activator of bone formation identified to date and illustrates that developmentally important genes control physiological processes postnatally.
Keywords
Footnotes
-
↵Corresponding author.
-
E-MAIL karsenty{at}bcm.tmc.edu; FAX (713) 798-1465.
-
- Received January 8, 1999.
- Accepted February 19, 1999.
- Cold Spring Harbor Laboratory Press
