Document Type : Research Paper
Department of biology, Marvdasht Branch, Islamic Azad University, Marvdasht, Iran.
Medical Genetics Research Center, Mashhad University of Medical Sciences, Mashhad, Iran
Department of Biology, Faculty of Sciences, Zand Institute of Higher Education, Shiraz, Iran
Department of Biology, Damghan Branch, Islamic Azad University, Damghan, Iran
Background: Epithelial-mesenchymal transition (EMT) is a biological process in embryonic development and cancer
progression, and different gene families, such as HOX genes, are closely related to this process.
Objectives: Our aim in this study was to investigate the correlation between TWIST1 and EVX1 mRNA expression in
ESCC patients and also examine the probable regulatory function of TWIST1 on EVX1 expression in human ESCC cell
Materials and Methods: TWIST1 and EVX1 gene expression patterns were assessed in ESCC patients by relative
comparative Real-time PCR then correlated with their clinical characteristics. In silico analysis of the EVX1 gene was
conducted. KYSE-30 cells were transduced by a retroviral system to ectopically express TWIST1, followed by qRT-PCR
to reveal the correlation between TWIST1 and EVX1 gene expression.
Results: The expression of TWIST1 and EVX1 was correlated to each other significantly (p=0.005) in ESCC. Of 28
patients with under/normal expression of TWIST1, 22 samples (78.57%) had over/normal expression of EVX1. TWIST1
overexpression was correlated with advanced stages of the tumor (III, IV) (P = 0.019) and lymph node metastasis.
However, EVX1 under expression was associated with lymph node metastasis (p = 0.027) and invasiveness of the
disease (P = 0.037) in ESCC. Furthermore, retroviral transduction enforced significant overexpression of TWIST1 in
GFP-hTWIST-1 approximately 9-fold compared to GFP control cells, causing a – 8.83- fold reduction in EVX1 mRNA
Conclusions: Our results indicated the repressive role of TWIST1 on EVX1 gene expression in ESCC. Therefore, our
findings can help dissect the molecular mechanism of ESCC tumorigenesis and discover novel therapeutic targets for
ESCC invasion and metastasis