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Updated: Jun 10, 2025
Deficient Pms2, ERCC1, Ku86, CcOI in Field Defects During Progression to Colon Cancer
Published on: July 28, 2010
GLTSCR1 deficiency promotes colorectal cancer development through regulating non-homologous end joining
Fengyan Han1,2, Xiaoxu Zhou3, Lu Liu4
1Department of Pathology and International Institutes of Medicine, The Fourth Affiliated Hospital (Yiwu), Zhejiang University School of Medicine, Hangzhou, 310058, China. fengyan999@zju.edu.cn.
Abstract:
Non-homologous end joining (NHEJ), as one major pathway of DNA double-strand break (DSB) repair, could cause genomic instability, which plays pivotal roles in cancer development. While, chromatin remodeling complexes dictate the selection and orchestration of DSB repair pathways by regulating chromatin dynamics. However, the crosstalk between NHEJ and chromatin remodeling in cancer progress remains unclear. In this study, deficiency of GLTSCR1 causes resistance to DNA damage in colorectal cancer (CRC) cells by promoting NHEJ repair efficiency. Mechanistically, GLTSCR1 interacts with BRD9 to engage in the assembly of the non-canonical BAF complex (GBAF). However, GLTSCR1 deficiency disrupts GBAF and triggers the ubiquitination degradation of BRD9. Furthermore, GLTSCR1 deficiency causes aberrant opening in the promoter region of NHEJ repair-associated genes, which promotes CRC development. While, GLTSCR1 and its binding partner BRD9 are not directly involved in assembling NHEJ repair machinery; instead, they regulate the DNA accessibility of NHEJ repair-associated genes. Collectively, our findings confirm GLTSCR1 deficiency as a critical regulatory event of the NHEJ pathway in CRC development, which might require different therapeutic strategy for GLTSCR1 wild-type and mutant CRC.
Insights
GLTSCR1 deficiency promotes DNA repair and colorectal cancer (CRC) by enhancing non-homologous end joining (NHEJ). This highlights GLTSCR1 as a potential therapeutic target in CRC, suggesting different strategies for wild-type and mutant forms.
Area of Science:
- Genetics
- Molecular Biology
- Cancer Research
Background:
- Non-homologous end joining (NHEJ) repairs DNA double-strand breaks (DSBs) but can lead to genomic instability and cancer.
- Chromatin remodeling complexes influence DNA repair pathway selection, but their role in NHEJ and cancer progression is not fully understood.
Purpose of the Study:
- To investigate the role of GLTSCR1 in colorectal cancer (CRC) development by examining its connection to DNA repair and chromatin remodeling.
- To elucidate the mechanism by which GLTSCR1 influences non-homologous end joining (NHEJ) efficiency in CRC.
Main Methods:
- Assessed DNA damage resistance in colorectal cancer (CRC) cells with GLTSCR1 deficiency.
- Investigated the interaction between GLTSCR1 and BRD9 in the context of the GBAF complex.
- Analyzed the impact of GLTSCR1 deficiency on BRD9 stability and the accessibility of NHEJ repair-associated genes.
Main Results:
- GLTSCR1 deficiency confers resistance to DNA damage in CRC cells by enhancing NHEJ repair.
- GLTSCR1 interacts with BRD9 to form the GBAF complex; its deficiency leads to BRD9 degradation.
- GLTSCR1 deficiency results in aberrant chromatin opening at NHEJ gene promoters, promoting CRC development.
Conclusions:
- GLTSCR1 deficiency is a critical factor in regulating the NHEJ pathway in colorectal cancer (CRC) progression.
- GLTSCR1 and BRD9 influence DNA accessibility of NHEJ-associated genes, rather than directly participating in the repair machinery.
- Findings suggest distinct therapeutic strategies may be needed for GLTSCR1 wild-type versus mutant CRC.
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