Question

A female with cyclical abdominal pain, diabetes mellitus onset at age 10, and chronic kidney disease by age 18, with a family history of diabetes and uterine malformation, presents a clinical pattern characteristic of which diagnosis?

• A. Family history of diabetes
• B. MRKH syndrome
• C. MODY-5 (HNF1B mutation)
• D. DIDMOAD

Hint:

MODY Subtypes High-Yield Associations:
MODY 2 (Glucokinase): Mild, stable, asymptomatic fasting hyperglycemia; rarely requires treatment.
MODY 3 (HNF1A): Most common overall; highly sensitive to low-dose sulfonylureas.
MODY 5 (HNF1B): The "Syndromic MODY" $\rightarrow$ Diabetes + severe Renal Cysts/CKD + Uterine/Genitourinary malformations.

Answer 1

The Correct Option is C

Concept:
A young female patient presents with a highly specific, complex, and severe syndromic constellation: young-onset diabetes mellitus, rapidly progressive non-diabetic early-onset chronic kidney disease (CKD), and a strong familial history of these traits, combined uniquely with a severe uterine malformation causing cyclical abdominal pain.
The clinical task is to accurately recognize this textbook multisystemic presentation and link it to the specific, rare monogenic diabetic syndrome it represents.
Explanation:
• Maturity-Onset Diabetes of the Young (MODY) encompasses a group of rare, strongly autosomal dominant, monogenic forms of diabetes characterized by a primary defect in pancreatic beta-cell function, typically presenting before the age of 25.

• Among the various subtypes, MODY-5 stands out as a unique and complex multisystemic genetic disorder.

• MODY-5 is caused specifically by deleterious mutations in the HNF1B (Hepatocyte Nuclear Factor-1 Beta) gene (Option C).

• The HNF1B transcription factor is biologically crucial for the normal embryonic development and morphogenesis of the pancreas, the kidneys, and the entire urogenital tract.

• Consequently, patients with an HNF1B mutation invariably present with severe, early-onset diabetes mellitus (due to pancreatic hypoplasia or profound beta-cell dysfunction).

• Even more classically, they develop highly aggressive, progressive, non-diabetic Chronic Kidney Disease (CKD) very early in life, almost always driven by severe underlying renal morphological abnormalities, most notoriously the presence of numerous renal cysts (frequently misdiagnosed initially as polycystic kidney disease) or profound renal dysplasia.

• Furthermore, because HNF1B is essential for the normal development of the paramesonephric (Müllerian) ducts in females, female patients frequently and characteristically present with severe uterine malformations (such as a bicornuate uterus, a rudimentary horn, or complete uterine agenesis).

• If a patient possesses a functioning endometrium alongside an obstructed or anomalous outflow tract (e.g., vaginal agenesis or a blind rudimentary horn), the retention of menstrual blood (hematometra) will classically present as severe, cyclical, monthly abdominal pain, exactly as described in this vignette.

• While MRKH syndrome (Option B) classically features Müllerian agenesis, it is strictly an isolated reproductive tract anomaly and is completely unassociated with young-onset diabetes or severe progressive renal disease.

• DIDMOAD (Wolfram syndrome) (Option D) features Diabetes Insipidus, Diabetes Mellitus, Optic Atrophy, and Deafness, which does not fit this clinical presentation.
Final Answer:
The highly specific, multisystemic combination of young-onset diabetes, severe cystic renal disease, and profound Müllerian (uterine) tract anomalies is the absolute classic and defining presentation of MODY-5 (caused by an HNF1B mutation).