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ID: 411642.0, MPI für molekulare Genetik / Research Group Development and Disease
Expression of Runx2 transcription factor in non-skeletal tissues, sperm and brain
Authors:Jeong, Jae-Hwan; Jin, Jung-Sook; Kim, Hyun-Nam; Kang, Sang-Min; Liu, Julie C.; Lengner, Christopher J.; Otto, Florian; Mundlos, Stefan; Stein, Janet L.; van Wijnen, Andre J.; Lian, Jane B.; Stein, Gary S.; Choi, Je-Yong
Research Context:Ministry of Health and Welfare of Korea; Grant Number: 01-PJ3-PG6-01GN11-0002. Korea Science and Engineering Foundation (KOSEF), Korea government (MOST); Grant Number: R01-2006-000-11046-0. Brain Korea 21 Project in 2006. NIH; Grant Number: AR039588.
Date of Publication (YYYY-MM-DD):2008-07-17
Title of Journal:Journal of Cellular Physiology
Journal Abbrev.:J Cell Physiol.
Issue / Number:2
Start Page:511
End Page:517
Copyright:© 2009 Wiley-Liss, Inc., A Wiley Company
Review Status:not specified
Audience:Experts Only
Abstract / Description:Runx2 is a master transcription factor for chondrocyte and osteoblast differentiation and bone formation. However expression of Runx2 (by RT-PCR), has been reported in non-skeletal tissues such as breast, T cells and testis. To better define Runx2 activity in non-skeletal tissues, we examined transgenic (Tg) mice expressing LacZ gene under control of 3.0 kb (3 kb Tg) or 1.0 kb (1 kb Tg) of the Runx2 distal (P1) promoter, Runx2 LacZ knock-in (Runx2+/LacZ) and Runx2/P1 LacZ knock-in (Runx2/P1+/LacZ). In the Runx2 3 kb Tg mouse, -galactosidase (-gal) expression appeared in various non-skeletal tissues including testis, skin, adrenal gland and brain. -gal expression from both 3 kb and 1 kb Tg, reflecting activity of the Runx2 promoter, was readily detectable in seminiferous tubules of the testis and the epididymis. At the single cell level, -gal was detected in spermatids and mature sperms not in sertoli or Leydig cells. We also detected a positive signal from the Runx2+/LacZ and Runx2/P1+/LacZ mice. Indeed, Runx2 expression was observed in isolated mature sperms, which was confirmed by RT-PCR and Western blot analysis. Runx2, however, was not related to sex determination and sperm motility. Runx2 mediated -gal activity is also found robustly in the hippocampus and frontal lobe of the brain in Runx2+/LacZ. Collectively, these results indicate that Runx2 is expressed in several non-skeletal tissues particularly sperms of testis and hippocampus of brain. It suggests that Runx2 may play an important role in male reproductive organ testis and brain.
Comment of the Author/Creator:email: Je-Yong Choi (jechoi@knu.ac.kr)

Correspondence to Je-Yong Choi, 101 Dong-In Dong, Jung-Gu, Department of Biochemistry and Cell Biology, School of Medicine, Kyungpook National University, Daegu 700-422, Republic of Korea.
External Publication Status:published
Document Type:Article
Communicated by:Stefan Mundlos
Affiliations:MPI für molekulare Genetik
External Affiliations:1.Department of Biochemistry and Cell Biology, School of Medicine, Cell and Matrix Research Institute, Skeletal Diseases Genome Research Center, Kyungpook National University, Daegu, Republic of Korea;
2.Department of Cell Biology, University of Massachusetts Medical School, Worcester, Massachusetts, USA;
3.Division of Hematology/Oncology, Medical Center, University of Freiburg, Freiburg, Germany.
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