Distinctive gastrointestinal motor dysfunction in patients with MNGIE

Area of Science:

• Gastroenterology
• Neurology
• Genetics
• Rare Diseases

Background:

• Mitochondrial neurogastrointestinal encephalomyopathy (MNGIE) is a rare genetic disorder caused by TYMP gene mutations.
• It leads to severe gastrointestinal dysmotility, cachexia, and neuropathy.
• Gastrointestinal motor dysfunction in MNGIE requires systematic evaluation.

Purpose of the Study:

• To characterize gastrointestinal motor dysfunction in MNGIE patients.
• To correlate motor abnormalities with clinical symptoms using advanced techniques.

Main Methods:

• Prospective study of MNGIE patients at a Spanish national referral center (Jan 2018 - July 2022).
• Evaluation included high-resolution manometry (esophageal and small bowel) and gastric emptying scintigraphy.
• Assessment of digestive symptoms alongside objective motor function tests.

Main Results:

• Five MNGIE patients (16-46 years) were evaluated.
• Esophageal motility was abnormal in 4/5 patients.
• Small bowel manometry revealed a unique dysmotility pattern (spasmodic contractions) in all patients.
• Gastric emptying was delayed in 4/5 patients.
• Objective motor dysfunction was present even with mild or absent severe digestive symptoms.

Conclusions:

• MNGIE patients exhibit characteristic motor dysfunction, especially in the small bowel.
• This dysfunction occurs irrespective of symptom severity or morphological signs of intestinal failure.
• Early investigation is recommended as symptoms do not reliably predict objective motor findings.