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What is MODY? (Maturity-Onset Diabetes of the Young)
Monogenic diabetes caused by a single-gene mutation; inheritance is autosomal-dominant (each child of an affected parent has a 50 % risk).
Typically presents before age 25–30 but can appear later.
Accounts for ≈ 1–2 % of all diabetes cases—even a small practice is likely to have at least one patient.
| Key issue | Why it’s important to you & your patients |
|---|---|
| 🚩 Misclassification | Up to 90 % of people with MODY are initially coded as type 1 or type 2 diabetes—so opportunities for tailored care are missed. diabetes.org.uk |
| 💊 Precision treatment | Common sub-types (HNF1A/4A) respond to tiny doses of sulfonylurea, while GCK-MODY often needs no drug therapy—accurate diagnosis can stop unnecessary lifelong insulin and daily finger-pricks. diabetesgenes.org |
| 👪 Cascade testing | Because MODY is autosomal-dominant, one correct diagnosis prompts targeted genetic testing for relatives and early intervention. diabetesgenes.orgdiabetes.org.uk |
| 📚 Curriculum relevance | The RCGP Metabolic Problems & Endocrinology guide lists “rarer types such as MODY” as core knowledge for AKT, CSA & WPBA—so examiners expect you to spot it. rcgp.org.uk |
Think Maturity-Onset Diabetes of the Young when a lean young adult...
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