MKRN3 circulating levels in Prader-Willi syndrome: a pilot study

Area of Science:

• Endocrinology
• Genetics
• Metabolic Disorders

Background:

• Prader-Willi syndrome (PWS) is often associated with hypogonadism, typically linked to hypothalamic dysfunction or primary gonadal issues.
• MKRN3, a maternally imprinted gene in the 15q11.2-q13 region, encodes makorin ring finger protein 3.
• MKRN3 deficiency is known to cause precocious puberty, a rare PWS symptom.

Purpose of the Study:

• To assess makorin ring finger protein 3 (MKRN3) levels in patients diagnosed with Prader-Willi syndrome (PWS).
• To investigate the relationship between MKRN3 levels and sexual hormone status, insulin resistance, and Body Mass Index (BMI) in PWS patients.

Main Methods:

• An observational, cross-sectional study design was employed.
• Eighty patients with genetically confirmed Prader-Willi syndrome (PWS) were enrolled.
• Median patient age was 9.6 years.

Main Results:

• MKRN3 levels were measurable in 49 out of 80 PWS patients (geometric mean: 34.9 ± 22 pg/ml).
• Unmeasurable MKRN3 levels were detected in 31 patients.
• MKRN3 levels showed an inverse correlation with HOMA-IR (p=0.005) and HbA1c (p=0.046), and a direct correlation with FSH (p=0.007).

Conclusions:

• Measurable MKRN3 in PWS patients may indicate tissue-specific imprinting or other regulatory factors, diverging from expected unmeasurable levels due to paternal allele inactivation.
• Correlations with HOMA-IR, HbA1c, and FSH suggest potential peripheral actions of MKRN3.
• Further research is needed to elucidate the precise peripheral roles and regulatory mechanisms of MKRN3 in PWS.