Chinese Journal of Clinical Anatomy ›› 2020, Vol. 38 ›› Issue (6): 691-696.doi: 10.13418/j.issn.1001-165x.2020.06.013

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Regulation of SOX9 by HOXD13 may be related to the occurrence of congenital foot malformation

WANG Zheng-dong1, YAN Nan1, LIU Li-ying2, LI Shu1, CHEN Yao1, KONG Si-hui1,LI Pei-yuan1, JIN Chun-lian3   

  1. 1. Shenyang Medical College,Shenyang 11034; 2. Shenyang Maternal and Infant Hospital, Shenyang 110011; 3. China Medical University, Shenyang 110001, China
  • Received:2020-03-04 Online:2020-11-25 Published:2020-12-08

Abstract: Objective To study the molecular mechanism of HOXD13 and SOX9 genes in the occurrence of foot soft tissue malformation of idiopathic congenital talipes equinovarus (ICTEV). Methods  3 HOXD13 binding sites upstream of 5 'of SOX9 gene were predicted by the software, and luciferase activity of serial truncated and mutant vector in promoter region of SOX9 gene was detected. The binding effect of HOXD13 to the 3 sites of SOX9 gene promoter was verified by ChIP in vivo. The expression levels of HOXD13 and SOX9 were detected by qRT-PCR. Results A negative regulatory region between -1158 to -770 bp (site 1) and -512 to -368 bp (site 3) in the upstream of SOX9 gene 5' was found by the Luciferase. Between -770 and -512bp (locus 2) was a positive regulatory region. ChIP results showed that HOXD13 could bind to SOX9 locus 3.The mRNA expression of SOX9 gene was up-regulated by interference of HOXD13 expression. Conclusions The expression of SOX9 gene was up-regulated by HOXD13 in combination with the negative regulation region of SOX9 gene 5' upstream. The interference of HOXD13 up-regulated SOX9 gene expression may be related to the occurrence of soft tissue contracture on the ankle of foot.

Key words: Congenital foot deformity,  HOXD13,  SOX9,  Development,  Regulation

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