Structure and expression of murine intestinal trefoil factor: high evolutionary conservation and postnatal expression

Area of Science:

• Gastroenterology
• Molecular Biology
• Genetics

Background:

• Intestinal Trefoil Factor (ITF) is a peptide family involved in gastrointestinal tract repair.
• ITF expression is known to be upregulated at sites of injury and regeneration.
• Understanding ITF's role requires characterizing its structure and expression patterns.

Purpose of the Study:

• To molecularly clone the murine homologue gene of Intestinal Trefoil Factor (ITF).
• To characterize the structure and tissue-specific expression of murine ITF.
• To investigate the developmental expression pattern of ITF in mice.

Main Methods:

• Molecular cloning of the murine ITF gene.
• Sequence homology analysis comparing murine ITF to rat and human counterparts.
• Northern blot analysis to determine ITF expression in various adult mouse tissues.
• Immunohistochemical staining using anti-ITF antibodies on mouse tissues at different developmental stages.

Main Results:

• Murine ITF shares high nucleotide and amino acid homology with rat ITF (90% identity).
• Murine ITF shows 70% amino acid identity with human ITF.
• ITF is abundantly expressed in the adult mouse intestine and colon, minimally in the stomach, and not detected in other tested tissues.
• ITF expression is a post-natal event, detected in goblet cells of mice from three days old onwards, but absent in younger mice and embryos.

Conclusions:

• The murine ITF gene has been successfully cloned and its sequence characterized.
• ITF exhibits a specific expression pattern in the adult mouse gastrointestinal tract, predominantly in the intestine and colon.
• ITF expression initiates post-natally, suggesting a role in the development or maintenance of the mature intestinal epithelium.