MODY Diabetes

MODY (Maturity-Onset Diabetes of the Young) is a specific form of diabetes caused by genetic mutations that affect the function of pancreatic beta cells. Unlike the more common forms of type 1 and type 2 diabetes, MODY typically appears in young individuals, usually before the age of 25, and is inherited across generations within families.

Types of MODY diabetes

There are several types of MODY diabetes, each distinguished by specific genetic mutations. Every type has unique characteristics and clinical presentations:

• MODY 1 (HNF4A gene): Mutations in the HNF4A gene often cause elevated blood sugar levels in young individuals. Treatment may include oral medications.
• MODY 2 (GCK gene): Characterized by stable, mild hyperglycemia present from birth, usually not requiring treatment.
• MODY 3 (HNF1A gene): The most common type, caused by mutations in the HNF1A gene. Treatment may involve oral medications, though insulin might be needed later.
• MODY 4 (PDX1 gene): A rare form linked to mutations that reduce insulin secretion.
• MODY 5 (HNF1B gene): Associated with developmental abnormalities of the pancreas and kidneys; often requires diabetes treatment.
• MODY 6 (NEUROD1 gene): This type involves mutations in the NEUROD1 gene and can impact the function of pancreatic beta cells.
• Other rare MODY types: These involve various genetic mutations that affect beta cell function, leading to different degrees of insulin secretion impairment.

What are the symptoms of MODY diabetes?

The symptoms of MODY diabetes can vary depending on the specific type but are generally milder and less pronounced than those seen in type 1 or type 2 diabetes. Common symptoms include:

• Mild hyperglycemia: Individuals with MODY often have slightly elevated blood sugar levels that can remain stable over long periods without noticeable symptoms.
• Increased thirst and frequent urination: Certain types of MODY (especially MODY 3) may cause symptoms like increased thirst and frequent urination due to elevated blood sugar levels.
• Fatigue and exhaustion: In some cases, mild, chronic hyperglycemia can lead to fatigue or reduced energy levels.
• Abnormal blood glucose levels from childhood: For individuals with MODY 2, hyperglycemia may be present from birth and is often discovered incidentally during routine testing, without obvious symptoms.
• Weight loss: Although less common than in other types of diabetes, some forms of MODY may cause mild weight loss due to insufficient insulin production or reduced cellular response to insulin.
• Blurred vision: Elevated blood sugar levels can occasionally cause blurred vision in individuals with MODY, as hyperglycemia can affect the eye’s lens.
• Frequent skin or fungal infections: High blood sugar levels can increase the risk of recurrent skin infections, including bacterial and fungal infections, as elevated glucose can impair the body’s immune response.

Laboratory findings, such as normal C-peptide levels, often indicate preserved pancreatic function, supporting a diagnosis of MODY in the absence of autoantibodies.

How does NGS (Next-Generation Sequencing) aid in diagnosing MODY diabetes?

The MODY NGS (Next-Generation Sequencing) test uses advanced genetic analysis to identify specific mutations responsible for MODY diabetes. This test provides a comprehensive evaluation of the genes associated with MODY, enabling a rapid and precise diagnosis. The MODY NGS test covers a broad range of mutations, including those most commonly linked to diabetes in younger individuals, allowing for a clearer understanding of the condition.

Why is the MODY test important?

MODY diabetes is often misdiagnosed as type 1 or type 2 diabetes, which can result in unnecessary insulin treatment or inappropriate therapies. The MODY test ensures an accurate diagnosis, which can help adjust treatment plans without relying on insulin.

Because MODY is hereditary, testing family members can help with early detection and enable preventive measures. This leads to better blood sugar management and reduces the risk of long-term complications.

Who should consider the MODY NGS test?

The MODY diabetes test is recommended for individuals who meet the following criteria:

• Diagnosis of diabetes during adolescence or early adulthood.
• Positive family history, particularly if a close relative has been diagnosed with MODY diabetes.
• Stable hyperglycemia that occurs without the need for high doses of insulin.
• Absence of pancreatic autoantibodies (GAD, IA-2, and/or islet cell antibodies), which helps rule out type 1 diabetes.
• Moderately elevated fasting glucose levels, without the typical signs of type 2 diabetes or metabolic syndrome.
• Abnormal results on an Oral Glucose Tolerance Test (OGTT).
• Glucosuria (presence of glucose in the urine) without significant hyperglycemia.
• Presence of kidney cysts or other renal abnormalities.
• Diabetes diagnosed during pregnancy with a suspected genetic predisposition.

How is the MODY diabetes test performed?

The MODY test involves analyzing a blood sample, which is then sequenced to detect specific genes associated with MODY diabetes. The test results provide precise identification of genetic mutations and the corresponding MODY subtype.

Cost and turnaround time for the MODY diabetes test

The cost of the MODY diabetes test is 77,000 RSD, with results available within 4 to 6 weeks. After the analysis, our specialists provide a detailed interpretation of the results along with personalized treatment recommendations. At IntroLab in Belgrade, we also offer diabetes counseling, where our experts provide comprehensive support and guidance in managing diabetes for both patients and their families.