Related Experiment Video
Updated: May 2, 2026
In Vitro Selection of Engineered Transcriptional Repressors for Targeted Epigenetic Silencing
Published on: May 5, 2023
Expression of DNMTs and MBD2 in GIST
Miao He1, Jing Fan2, Rong Jiang3
1Departments of General Surgery, The First Affiliated Hospital of Chongqing Medical University, Chongqing 400016, P.R. China ;
Abstract:
The aim of this study was to investigate the protein expression of DNA methyltransferases (DNMTs, including DNMT1, DNMT2, DNMT3A, DNMT3B and DNMT3L) and methyl-CpG-binding domain protein 2 (MBD2) in gastrointestinal stromal tumor (GIST). Immunohistochemistry and western blot analysis were used to detect expression of DNMT and MBD2 in 15 pairs of adult GIST and matched non-tumor tissues. The protein expression of DNMT1, DNMT2, DNMT3B, DNMT3L and MBD2 was significantly higher in adult GISTs compared to the matched non-tumor tissues (P<0.05). However, no significant difference was detected in the protein expression of DNMT3A between tumor and non-tumor tissues (P>0.05). Associations between DNMT1 expression and mitotic index, DNMT3B expression and tumor size, as well as DNMT3L expression and Helicobacter pylori infection were detected in GISTs (P<0.05). In conclusion, GISTs exhibit a high protein expression of DNMT (with the exception of DNMT3A) and MBD2.
Insights
Gastrointestinal stromal tumors (GISTs) show increased protein levels of DNA methyltransferases (DNMTs) and MBD2, except for DNMT3A. These findings may offer new insights into GIST development and potential therapeutic targets.
Area of Science:
- Oncology
- Molecular Biology
- Epigenetics
Background:
- Gastrointestinal stromal tumors (GISTs) are the most common mesenchymal tumors of the gastrointestinal tract.
- DNA methyltransferases (DNMTs) and methyl-CpG-binding domain protein 2 (MBD2) play crucial roles in epigenetic regulation.
- Altered expression of DNMTs and MBD2 has been implicated in various cancers.
Purpose of the Study:
- To investigate the protein expression levels of DNMTs (DNMT1, DNMT2, DNMT3A, DNMT3B, DNMT3L) and MBD2 in adult GIST.
- To compare the expression of these proteins in GIST tissues versus matched non-tumor tissues.
- To explore potential associations between DNMT/MBD2 expression and clinical parameters in GIST.
Main Methods:
- Immunohistochemistry was employed to detect protein expression.
- Western blot analysis was utilized for quantitative assessment.
- 15 pairs of adult GIST and matched non-tumor tissues were analyzed.
Main Results:
- Significantly higher protein expression of DNMT1, DNMT2, DNMT3B, DNMT3L, and MBD2 was observed in GISTs compared to non-tumor tissues (P<0.05).
- No significant difference in DNMT3A protein expression was found between GIST and non-tumor tissues (P>0.05).
- Associations were found between DNMT1 and mitotic index, DNMT3B and tumor size, and DNMT3L and Helicobacter pylori infection.
Conclusions:
- GISTs demonstrate elevated protein expression of most DNMTs (excluding DNMT3A) and MBD2.
- These epigenetic modifiers may contribute to GIST pathogenesis.
- Further research into the role of DNMTs and MBD2 in GIST could reveal therapeutic strategies.
