Increased rDNA transcriptional activity in celiac disease

Area of Science:

• Cell Biology
• Genetics
• Immunology

Background:

• Celiac disease (CD) is an autoimmune disorder triggered by gluten ingestion.
• Increased risk of certain malignancies, such as non-Hodgkin's lymphoma (NHL), is observed in CD patients.
• Nucleolar organizer regions (NORs) are chromosomal structures involved in ribosomal RNA gene transcription.

Purpose of the Study:

• To investigate the activity of NORs in peripheral blood lymphocytes of celiac disease patients.
• To compare NORs activity between healthy controls, celiac disease patients (varying treatment adherence), and CD patients with complicating NHL.
• To explore the potential link between altered NORs activity and malignancy risk in celiac disease.

Main Methods:

• Silver (Ag)-staining technique was employed to visualize and quantify NORs.
• Analysis of 20 metaphases per individual to determine the average number of Ag-NORs per cell.
• Comparison of Ag-NORs counts between healthy controls (n=20), celiac disease patients (n=32), and CD patients with NHL (n=3).

Main Results:

• Celiac disease patients exhibited significantly higher Ag-NORs counts (6.62 +/- 0.65) compared to healthy controls (5.70 +/- 0.81) (p < 0.001).
• This increase in NORs activity was observed across different CD patient groups, all differing significantly from controls.
• CD patients with complicating NHL showed a further statistically significant increase in Ag-NORs frequency (7.20 +/- 0.39) compared to both CD patients and controls (p < 0.02 and p < 0.001, respectively).

Conclusions:

• The findings suggest increased transcriptional activity of ribosomal DNA (rDNA) in celiac disease.
• Elevated NORs activity in CD may be associated with the heightened incidence of malignancy observed in this condition.
• Further longitudinal studies are recommended to confirm these associations and elucidate the underlying mechanisms.