MODY (Maturity-Onset Diabetes of the Young) — Detailed

Monogenic diabetes caused by autosomal dominant single-gene mutations affecting beta-cell function.

Written by: Saygı Hospital Health Guide Editorial Board

Published: February 1, 2026

This content is for general information; please consult your physician for diagnosis and treatment.

References (5)

This content is for informational purposes only and does not constitute medical advice. You can book an appointment at our Endokrinoloji department. Book Appointment →

What is MODY (Maturity-Onset Diabetes of the Young) — Detailed?

MODY is a heterogeneous group of monogenic diabetes caused by single-gene mutations affecting pancreatic beta-cell development or function. It accounts for 1-5% of diabetes cases and follows an autosomal dominant inheritance pattern.

Common subtypes include HNF1A-MODY (MODY3, most prevalent), GCK-MODY (MODY2, mild fasting hyperglycemia), HNF4A-MODY (MODY1) and HNF1B-MODY (MODY5, with renal cysts). Diagnosis requires genetic testing and influences treatment.

Distinction from type 1 and type 2 diabetes is critical: HNF1A and HNF4A subtypes are highly responsive to low-dose sulfonylureas, GCK-MODY usually requires no treatment, and HNF1B-MODY needs renal monitoring.

Symptoms

Mild to moderate hyperglycemia

Often asymptomatic at diagnosis

Polyuria and polydipsia (some subtypes)

Strong family history of diabetes (3+ generations)

Onset usually before age 25

Absence of obesity or autoimmune markers

Renal cysts in HNF1B-MODY

Risk Factors

Autosomal dominant family history

Diabetes in 3 consecutive generations

Negative islet autoantibodies

Preserved C-peptide levels

Non-obese phenotype

Atypical type 1 or type 2 presentation

Renal anomalies in some subtypes

When to See a Doctor?

If you experience any of the following symptoms, seek medical attention promptly:

Diabetes diagnosed before age 25
Strong multigenerational family history
Atypical clinical presentation
Hyperglycemia without obesity or autoimmunity
Renal cysts with diabetes
Need for genetic counseling

Treatment Methods

Low-dose sulfonylureas in HNF1A/HNF4A-MODY

Diet management alone in GCK-MODY

Insulin if necessary in selected subtypes

Genetic testing for diagnosis confirmation

Family screening and counseling

Renal monitoring in HNF1B-MODY

Regular glycemic and complication follow-up

Which Department to Visit?

You can visit our Endokrinoloji department for these complaints. Our specialist physicians will create the most suitable treatment plan for you.

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Health Disclaimer: The information on this page is prepared for general informational purposes only. It does not replace medical diagnosis and treatment. Please consult your physician for your complaints. Saygı Hospital does not accept responsibility for actions taken based on the information on this page.