[Gene expression profiling using oligonucleotide microarray in atrophic gastritis and intestinal metaplasia].

Area of Science:

• Gastroenterology
• Molecular Biology
• Oncology

Background:

• Atrophic gastritis with intestinal metaplasia is a major risk factor for gastric cancer.
• The molecular mechanisms underlying this process are not fully understood.
• Identifying key molecules is crucial for understanding gastric carcinogenesis.

Purpose of the Study:

• To analyze the genome-wide gene expression patterns in patients with atrophic gastritis and intestinal metaplasia.
• To identify differentially expressed genes associated with gastric precancerous lesions.
• To establish a molecular genetic basis for gastric cancer development.

Main Methods:

• Oligonucleotide microarray technique was employed to compare gene expression profiles.
• Significance Analysis of Microarrays (SAM) was used to identify differentially expressed genes.
• Global, intensity-dependent, and box plot normalization methods were applied for data analysis.

Main Results:

• Eight genes (FABP, REG, OR6C1, MEP1, SLC6A1, SI, Mucin 1, RAB23) were significantly upregulated (>10-fold) in atrophic gastritis with intestinal metaplasia.
• One gene (LOC44119) was significantly downregulated (>10-fold).
• Expression patterns of known gastric carcinogenesis genes (e.g., FN1, TP53, TGFB1) showed significant alterations (>2-fold).

Conclusions:

• Oligonucleotide microarray successfully identified genome-wide patterns in atrophic gastritis with intestinal metaplasia.
• These findings provide a foundational bioinformatic resource for clinical applications.
• The results are expected to aid in the diagnosis and treatment of gastric cancer and its precancerous lesions.