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Journal of Biosciences

, 44:127 | Cite as

Sp7/osterix positively regulates dlx2b and bglap to affect tooth development and bone mineralization in zebrafish larvae

  • Zhongjian Chen
  • Zhiyun Song
  • Jinjing Yang
  • Jian Huang
  • Hongbing JiangEmail author
Article
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Abstract

Osterix (or Sp7) is an important transcription factor that promotes osteoblast differentiation by modulating the expression of a range of target genes. Although many studies have focused on Osterix/Sp7 regulatory mechanisms, the detailed functions have not been fully elucidated. Toward this end, in this study, we used CRISPR/Cas9 technology to knock out the zebrafish sp7 gene, and then analyzed its phenotype and biological function. Two knockout sp7 mutant lines were successfully obtained. The bone mineralization level was significantly reduced in the zebrafish sp7−/− homozygote, resulting in abnormal tooth development in the larvae. Quantitative real-time polymerase chain reaction showed that loss of sp7 led to down-regulated expression of the dlx2b and bglap genes related to tooth development and bone mineralization, respectively. Moreover, cell transfection experiments demonstrated that Sp7 directly regulates the expression of dlx2b and bglap through Sp7-binding sites on the promoter regions of these two genes. Overall, this study provides new insight into the role of Sp7 in bone mineralization and tooth development.

Keywords

bglap bone mineralization dlx2b Osterix/sp7 tooth development 

Notes

Acknowledgements

This work was supported by Grants from Suzhou people’s Welfare and Science Items (SYS201659).

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Copyright information

© Indian Academy of Sciences 2019

Authors and Affiliations

  • Zhongjian Chen
    • 1
    • 2
    • 3
  • Zhiyun Song
    • 3
  • Jinjing Yang
    • 4
  • Jian Huang
    • 4
  • Hongbing Jiang
    • 1
    • 2
    Email author
  1. 1.Jiangsu Key Laboratory of Oral DiseasesNanjing Medical UniversityNanjingChina
  2. 2.Department of Oral and Maxillofacial SurgeryThe Affiliated Hospital of Stomatology, Nanjing Medical UniversityNanjingChina
  3. 3.The Affiliated Stemmatological Hospital of Soochow UniversitySuzhouChina
  4. 4.School of Biology and Basic Medical SciencesSoochow UniversitySuzhouChina

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