Lack of DMBT1 expression in oesophageal, gastric and colon cancers

Area of Science:

• Oncology
• Molecular Biology
• Genetics

Background:

• Loss of sequences on human chromosome 10q is implicated in various cancers.
• DMBT1 (deleted in malignant brain tumors 1) is a candidate tumour-suppressor gene located in this critical chromosomal region.

Purpose of the Study:

• To investigate the mRNA expression and homozygous deletion of the DMBT1 gene in human oesophageal, gastric, and colon cancers.
• To assess the potential role of DMBT1 as a tumour suppressor in gastrointestinal malignancies.

Main Methods:

• Reverse transcriptase polymerase chain reaction (RT-PCR) was used to analyze DMBT1 mRNA expression.
• Duplex PCR was employed to detect homozygous deletions within the DMBT1 gene in primary tumours and cancer cell lines.

Main Results:

• Reduced DMBT1 mRNA expression was observed in 53.5% of oesophageal, 12.5% of gastric, and 16.7% of colorectal cancers compared to normal tissues.
• No DMBT1 expression was detected in 12 out of 15 oesophageal cancer cell lines.
• Homozygous deletions of DMBT1 were identified in 11.6% of oesophageal primary tumours and 13.3% of oesophageal cancer cell lines.

Conclusions:

• The study suggests that DMBT1 functions as a tumour suppressor gene in gastrointestinal cancers.
• DMBT1 plays a significant role, particularly in the development of oesophageal cancers.