Mehmet SARĞIN, Arzu KARABAY, Gökçe GÜLLÜ AMURAN, Neslihan AYDIN, Oğuzhan Fatih BALTACI, Temel YILMAZ, Şeyma ÇOLAKOĞLU, Ergül BERBER

Exploring the role of miRNAs in the diagnosis of MODY3

Background/aim: MODY3 associated with HNF1A is the most common form of MODY and is clinically misdiagnosed as type 1diabetes due to similar clinical symptoms. This study aimed to analyze the role of HNF1A-regulated miRNAs as a biomarker in thediagnosis of MODY3.Materials and methods: MIN6 cells were transfected with the HNF1A cDNA expression vector for overexpression or with siRNAspecific to HNF1A to silence its expression. The HNF1A-regulated miRNAs were determined by RNA-Seq of the total RNA extract.Expressions of the candidate miRNAs in blood samples of MODY3, type 1 diabetes, and type 2 diabetes patients and in healthy subjectswere compared statistically by Mann–Whitney U tests.Results: This study revealed the presence of 238 known HNF1A-regulated miRNAs in MIN6 cells. miR-129-1-3p, miR-200b-3p, andmiR-378a-5p were selected as candidate miRNAs. The expression level of miR-378a-5p significantly decreased in type 2 diabetes andMODY3 patients, while miR-200b-3p expression was significantly decreased only in MODY3 patients.Conclusion: Although further studies with larger numbers of patients are required, this study demonstrated that the expression levelsof miR-200b-3p and miR-378a-5p decrease in MODY3 patients and suggests that miR-200b-3p is an especially strong candidate to useclinically for selecting suspected MODY3 patients.

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