New Pathogenic Mutations Associated with Diacylglycerol O-Acyltransferase 1 Deficiency

Area of Science:

• Biochemistry
• Genetics
• Pediatrics

Background:

• Diacylglycerol O-acyltransferase 1 (DGAT1) deficiency is a rare genetic disorder causing congenital diarrhea.
• It results from pathogenic mutations in the DGAT1 gene, affecting lipid metabolism.
• Understanding DGAT1's role is crucial for diagnosing and managing rare gastrointestinal disorders.

Observation:

• Two patients with DGAT1 deficiency and compound heterozygous inheritance were studied.
• Unusual clinical presentations were observed, deviating from typical DGAT1 deficiency phenotypes.
• One patient exhibited a macrophage activation syndrome-like response.

Findings:

• Newly described pathogenic mutations in DGAT1 were identified in both patients.
• The macrophage activation syndrome-like presentation in one patient was notably ameliorated by a low-fat diet.
• This suggests a potential link between DGAT1 function, lipid metabolism, and inflammatory responses.

Implications:

• Highlights the phenotypic variability of DGAT1 deficiency.
• Suggests dietary fat modification as a therapeutic strategy for specific presentations.
• Emphasizes the importance of genetic testing for congenital diarrheal disorders with atypical features.