A case of monogenic diabetes mellitus caused by a novel heterozygous nonsense mutation in a 14-year-old girl.

Objectives: Monogenic diabetes mellitus (DM) is a single gene disorder, primarily characterized by impairment in the development or function of pancreatic beta cells.

Case Presentation: A 14-year-old girl was initially diagnosed with type 2 DM. The patient did not have any anti-islet autoantibody and showed acanthosis nigricans.